CN112305731A - Zoom lens - Google Patents
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- CN112305731A CN112305731A CN202011160830.2A CN202011160830A CN112305731A CN 112305731 A CN112305731 A CN 112305731A CN 202011160830 A CN202011160830 A CN 202011160830A CN 112305731 A CN112305731 A CN 112305731A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/145—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having five groups only
- G02B15/1451—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having five groups only the first group being positive
- G02B15/145129—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having five groups only the first group being positive arranged +-+++
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
- G02B15/163—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
- G02B15/20—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 an additional movable lens or lens group for varying the objective focal length
Abstract
The invention relates to a zoom lens, which sequentially comprises a first fixed lens group (G1) with positive focal power, a zoom lens group (G2) with negative focal power, an aperture stop (S), a second fixed lens group (G3) with positive focal power, a focusing lens group (G4) with positive focal power and a third fixed lens group (G5) with positive focal power along the direction from an object side to an image side; the zoom lens group (G2) is movable in an optical axis direction for optical zooming of the zoom lens between a wide-angle end and a telephoto end, and the focus lens group (G4) is movable in the optical axis direction for compensating for a variation in an image plane position during the optical zooming; the diameter of the zoom lens
And the total optical length TTL of the zoom lens meets the following requirements:
the scheme meets the performance requirements of high magnification, small volume, large aperture and large target surface, and realizes full-focus 4K imaging.
Description
Technical Field
The invention relates to the field of optics, in particular to a zoom lens.
Background
With the development of the security industry, the performance requirements of the zoom lens are higher and higher, and especially the high requirements on the size and the resolution of a target surface are more prominent. The size of the target surface of the mainstream chip in the market at present is 1/1.8 ", the resolution is 8M, but this has not been able to meet the market demand more and more, and the 1/1.2" 8M chip will become the mainstream, but the zoom lens type matching the chip at present is few, and has the following disadvantages: large volume, small aperture, low resolution, no confocal phenomenon under infrared and high-low temperature conditions, and the like.
Disclosure of Invention
The invention aims to provide a zoom lens, which solves the problem of poor performance of the zoom lens.
In order to achieve the above object, the present invention provides a zoom lens, sequentially comprising, in a direction from an object side to an image side, a first fixed lens group having positive power, a zoom lens group having negative power, an aperture stop, a second fixed lens group having positive power, a focusing lens group having positive power, and a third fixed lens group having positive power;
the zoom lens group can move along the optical axis direction and is used for optical zooming of the zoom lens between a wide-angle end and a telephoto end, and the focusing lens group can move along the optical axis direction and is used for compensating the change of the image surface position in the optical zooming process;
the diameter of the zoom lens
And the total optical length TTL of the zoom lens meets the following requirements:
according to an aspect of the present invention, the first fixed lens group includes, in order in an object-side to image-side direction: a first lens with negative focal power, a second lens with positive focal power, and a third lens with positive focal power;
the first lens and the second lens form a cemented lens group.
According to an aspect of the present invention, the first lens element is a convex lens element having an object side and a concave image side, the second lens element is a convex lens element having an object side, and the third lens element is a convex lens element having an object side.
According to an aspect of the present invention, the zoom lens group includes, in order in an object-side to image-side direction: a fourth lens having a negative power, a fifth lens having a negative power, a sixth lens having a positive power, and a seventh lens having a negative power.
According to an aspect of the present invention, the fourth lens is a lens whose image side is concave, and the fifth lens is a lens whose object side is concave.
According to an aspect of the present invention, the second fixed lens group includes, in order in an object-side to image-side direction: an eighth lens having a positive power, a ninth lens having a negative power, a tenth lens having a positive power, an eleventh lens having a negative power, a twelfth lens having a positive power, and a thirteenth lens having a negative power.
According to an aspect of the present invention, the eighth lens is a lens whose object side is convex, the ninth lens and the eleventh lens are lenses whose image side is concave, the tenth lens and the twelfth lens are double convex lenses, and the thirteenth lens is a double concave lens.
According to an aspect of the present invention, the focusing lens group includes, in order in an object-side to image-side direction: a fourteenth lens having a positive power, a fifteenth lens having a negative power, and a sixteenth lens having a positive power.
According to an aspect of the present invention, the fourteenth lens element is a lens element having a convex object side, and the sixteenth lens element is a lens element having a convex image side.
According to an aspect of the present invention, the third fixed lens group includes, in order in an object-side to image-side direction: a seventeenth lens having a positive or negative optical power and an eighteenth lens having a positive or negative optical power.
According to an aspect of the present invention, the seventeenth lens is a meniscus or biconvex lens, and the eighteenth lens is a meniscus or meniscus lens.
According to an aspect of the present invention, the zoom lens includes at least two aspheric lenses, and at least one of the aspheric lenses is made of plastic material.
According to one aspect of the present invention, at least three cemented lens groups composed of a plurality of lenses are included in the zoom lens.
According to an aspect of the present invention, a focal length of the first fixed lens group is FG1, a focal length of the zoom lens group is FG2, a focal length of the second fixed lens group is FG3, a focal length of the focus lens group is FG4, a focal length of the third fixed lens group is FG5, and a focal length of the zoom lens at a wide-angle end is FW, respectively, satisfy: FG1/Fw is more than or equal to 2.0 and less than or equal to 4.5, FG2/Fw is more than or equal to-1.7 and less than or equal to-0.8, FG3/Fw is more than or equal to 1.2 and less than or equal to 2.2, FG4/Fw is more than or equal to 2.0 and less than or equal to 3.3, and FG5/Fw is more than or equal to 10.
According to an aspect of the invention, an abbe number Vb8 of the eighth lens satisfies the following relationship: vb8 is more than or equal to 60 and less than or equal to 96.
According to an aspect of the present invention, the refractive index of the eighth lens element, the tenth lens element, and the twelfth lens element is Nd, and the following is satisfied: nd is less than or equal to 1.68.
According to one scheme of the invention, a five-group framework with focal power of positive-negative-positive is adopted, so that the performance requirements of high magnification, small volume, large aperture and large target surface are met, and the full-focus 4K imaging is realized.
According to one scheme of the invention, the zoom lens structure with the five-group structure is adopted, so that a large target surface is achieved
And the performance of a constant aperture F1.4, the performance requirement of large magnification, small volume and large aperture and large target surface is met, and full focus can be realizedSegment 4K is imaged.
According to a scheme of the invention, chromatic aberration and secondary spectrum correction between 380 nm to 940nm of a long focal end are realized through reasonable focal power distribution and selection of specific lens materials, and full-focal-length infrared confocal can be met.
According to one scheme of the invention, through the matching of the refractive index temperature coefficients of specific materials, virtual focus is not generated at the temperature of-40 ℃ to +80 ℃, and the full focus end meets 4K resolution imaging.
Drawings
FIG. 1 is a schematic view of a zoom lens according to a first embodiment of the present invention;
fig. 2 schematically shows an MTF chart at the wide-angle end of a zoom lens according to a first embodiment of the present invention;
FIG. 3 is a schematic MTF graph of a zoom lens at a telephoto end according to a first embodiment of the present invention;
FIG. 4 schematically shows a 850nm defocus plot of a zoom lens at the wide-angle end according to a first embodiment of the present invention;
FIG. 5 is a diagram schematically showing a 850nm defocus graph of a zoom lens at a telephoto end according to a first embodiment of the present invention;
FIG. 6 is a view schematically showing a defocus curve of a zoom lens at-40 ℃ at the wide-angle end according to a first embodiment of the present invention;
FIG. 7 schematically shows a defocus curve of a zoom lens at 80 ℃ at the wide-angle end according to a first embodiment of the present invention;
FIG. 8 is a view schematically showing a defocus curve of a zoom lens at-40 ℃ at a telephoto end according to a first embodiment of the present invention;
FIG. 9 is a diagram schematically showing a defocus curve of a zoom lens at 80 ℃ at a telephoto end in accordance with a first embodiment of the present invention;
FIG. 10 is a schematic view showing a configuration of a zoom lens according to a second embodiment of the present invention;
fig. 11 schematically shows an MTF chart at the wide-angle end of a zoom lens according to a second embodiment of the present invention;
FIG. 12 is a schematic view showing an MTF chart at a telephoto end of a zoom lens according to a second embodiment of the present invention;
FIG. 13 is a view schematically showing a 850nm defocus plot of a zoom lens according to a second embodiment of the present invention at the wide-angle end;
FIG. 14 is a view schematically showing a 850nm defocus graph of a zoom lens according to a second embodiment of the present invention at a long-angle end;
FIG. 15 schematically shows a defocus graph of a zoom lens according to a second embodiment of the present invention at-40 ℃ at the wide-angle end;
fig. 16 schematically shows a defocus graph of a zoom lens according to a second embodiment of the present invention at 80 ℃ at the wide-angle end;
FIG. 17 is a view schematically showing a defocus curve of a zoom lens according to the second embodiment of the present invention at-40 ℃ in the telephoto end;
FIG. 18 is a view schematically showing a defocus graph of a zoom lens according to the second embodiment of the present invention at 80 ℃ at a long angle end;
FIG. 19 is a schematic view showing a configuration of a zoom lens according to a third embodiment of the present invention;
fig. 20 schematically shows an MTF chart at the wide-angle end of a zoom lens according to a third embodiment of the present invention;
FIG. 21 is a schematic view showing an MTF chart at a telephoto end of a zoom lens according to a third embodiment of the present invention;
FIG. 22 is a view schematically showing a 850nm defocus graph of a zoom lens according to a third embodiment of the present invention at the wide-angle end;
FIG. 23 is a view schematically showing a 850nm defocus graph of a zoom lens at a telephoto end according to a third embodiment of the present invention;
FIG. 24 is a view schematically showing a defocus curve of a zoom lens according to a third embodiment of the present invention at-40 ℃ at the wide-angle end;
fig. 25 schematically shows a defocus graph of a zoom lens according to a third embodiment of the present invention at 80 ℃ at the wide-angle end;
FIG. 26 is a view schematically showing a defocus graph at-40 ℃ at a telephoto end in a zoom lens according to a third embodiment of the present invention;
fig. 27 schematically shows a defocus graph of a zoom lens according to the third embodiment of the present invention at 80 ℃ at a telephoto end.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
The present invention is described in detail below with reference to the drawings and the specific embodiments, which are not repeated herein, but the embodiments of the present invention are not limited to the following embodiments.
As shown in fig. 1, according to one embodiment of the present invention, a zoom lens includes, in order from an object side to an image side, a first fixed lens group G1 having positive power, a zoom lens group G2 having negative power, an aperture stop S, 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. In the present embodiment, the zoom lens group G2 is movable in the optical axis direction for optical zooming of the zoom lens between the wide-angle end and the telephoto end, and the focus lens group G4 is movable in the optical axis direction for compensating for a change in the image plane position during optical zooming. In the present embodiment, the plate surface diameter of the zoom lens
And the total optical length TTL of the zoom lens meets the following requirements:
through the arrangement, the five-group framework with the focal power of positive-negative-positive meets the performance requirements of high magnification, small volume, large aperture and large target surface, and realizes the full-focus 4K imaging.
As shown in fig. 1, according to one embodiment of the present invention, the first fixed lens group G1 includes, in order from an object side to an image side: a first lens L1 having a negative power, a second lens L2 having a positive power, and a third lens L3 having a positive power. In the present embodiment, the first lens L1 and the second lens L2 constitute a cemented lens group.
In this embodiment, the first lens element L1 is a convex lens element with a convex object side and a concave image side, the second lens element L2 is a convex lens element with a convex object side, and the third lens element L3 is a convex lens element with a convex object side.
As shown in fig. 1, according to one embodiment of the present invention, the zoom lens group G2 includes, in order from an object side to an image side: a fourth lens L4 having a negative power, a fifth lens L5 having a negative power, a sixth lens L6 having a positive power, and a seventh lens L7 having a negative power.
In this embodiment, the fourth lens element L4 is a concave lens element on the image side, and the fifth lens element L5 is a concave lens element on the object side.
As shown in fig. 1, according to one embodiment of the present invention, the second fixed lens group G3 includes, in order from an object side to an image side: an eighth lens L8 having positive power, a ninth lens L9 having negative power, a tenth lens L10 having positive power, an eleventh lens L11 having negative power, a twelfth lens L12 having positive power, and a thirteenth lens L13 having negative power.
In this embodiment, the eighth lens L8 is a convex lens on the object side, the ninth lens L9 and the eleventh lens L11 are concave lenses on the image side, the tenth lens L10 and the twelfth lens L12 are double convex lenses, and the thirteenth lens L13 is a double concave lens.
As shown in fig. 1, according to one embodiment of the present invention, the focusing lens group G4 sequentially includes, in an object-to-image direction: a fourteenth lens L14 having a positive power, a fifteenth lens L15 having a negative power, and a sixteenth lens L16 having a positive power.
In this embodiment, the fourteenth lens element L14 is a lens element having a convex object side, and the sixteenth lens element L16 is a lens element having a convex image side.
As shown in fig. 1, according to one embodiment of the present invention, the third fixed lens group G5 includes, in order from the object side to the image side: a seventeenth lens L17 having a positive or negative power, and an eighteenth lens L18 having a positive or negative power.
In this embodiment, the seventeenth lens L17 is a meniscus or biconvex lens and the eighteenth lens L18 is a meniscus or meniscus lens from the object side to the image side.
As shown in fig. 1, according to an embodiment of the present invention, the zoom lens includes at least two aspheric lenses, and at least one of the aspheric lenses is made of plastic material.
As shown in fig. 1, according to one embodiment of the present invention, the zoom lens includes at least three groups of cemented lens groups composed of a plurality of lenses.
As shown in fig. 1, according to one embodiment of the present invention, when the focal length of the first fixed lens group G1 is FG1, the focal length of the zoom lens group G2 is FG2, the focal length of the second fixed lens group G3 is FG3, the focal length of the focusing lens group G4 is FG4, the focal length of the third fixed lens group G5 is FG5, and the focal length of the zoom lens at the wide-angle end is FW, the following are satisfied: FG1/Fw is more than or equal to 2.0 and less than or equal to 4.5, FG2/Fw is more than or equal to-1.7 and less than or equal to-0.8, FG3/Fw is more than or equal to 1.2 and less than or equal to 2.2, FG4/Fw is more than or equal to 2.0 and less than or equal to 3.3, and FG5/Fw is more than or equal to 10.
As shown in fig. 1, according to an embodiment of the present invention, abbe number Vb8 of eighth lens L8 satisfies the following relationship: vb8 is more than or equal to 60 and less than or equal to 96.
As shown in fig. 1, according to one embodiment of the present invention, the refractive indices of the eighth lens L8, the tenth lens L10, and the twelfth lens L12 are Nd, and satisfy: nd is less than or equal to 1.68. In the present embodiment, the refractive indices of the eighth lens L8, the tenth lens L10, and the twelfth lens L12 may be the same or different.
With the above arrangement, the zoom lens of the present invention has better imaging quality and higher resolution by optimizing the performance of the eighth lens L8, the tenth lens L10, and the twelfth lens L12.
By the arrangement, the zoom lens structure with the five-group framework is adopted, and a large target surface is achieved
And the performance of the constant aperture F1.4 meets the performance requirement of large-magnification small-volume large-aperture large target surface, and can realize full-focus 4K imaging.
Through the arrangement, chromatic aberration and secondary spectrum correction between 380 nm to 940nm of a long focal end are realized through reasonable focal power distribution and selection of specific lens materials, and full-focal-length infrared confocal can be met.
Through the arrangement, the non-virtual focus at the temperature of-40 ℃ to +80 ℃ is realized through the matching of the temperature coefficients of the refractive indexes of the specific materials, and the full focus end meets the 4K resolution imaging.
The following provides 3 specific groups of embodiments according to the above-described arrangement of the present invention to specifically explain the imaging lens according to the present invention
Three sets of embodiment data are as in table 1 below:
TABLE 1
The first implementation mode comprises the following steps:
in this embodiment, the zoom lens of the present invention comprises 18 lens elements, wherein the lens elements have a plurality of cemented lens elements consisting of a plurality of lens elements, and the aperture stop S and the filter a comprise 33 optical surfaces, which are numbered as S1-S33 in sequence for convenience of description, wherein S13 is the aperture stop replaced by S, and the image plane IMA.
Table 2 below lists relevant parameters of each lens of the present embodiment, including surface type, radius of curvature (R value), thickness, refractive index of material, abbe number:
TABLE 2
Table 3 shows the aspherical surface coefficients of the aspherical lenses in the present embodiment, K is a conic constant of the surface, and A, B, C, D, E are aspherical surface coefficients of fourth order, sixth order, eighth order, tenth order, and twelfth order, respectively.
| Serial number | K | A | B | C | D | E |
| S11 | 2.31E-01 | 2.47E-06 | 8.91E-09 | -2.29E-10 | 2.12E-12 | -7.63E-15 |
| S12 | 2.31E+01 | 2.57E-06 | 1.29E-08 | -3.20E-10 | 3.94E-12 | -1.83E-14 |
| S14 | -3.90E-01 | -3.40E-06 | 2.44E-08 | -1.26E-10 | 4.26E-13 | -1.06E-15 |
| S15 | -5.42E-01 | 8.53E-06 | -4.84E-08 | 1.28E-09 | -1.52E-11 | 6.61E-14 |
| S30 | -1.70E+01 | -4.08E-06 | 1.40E-07 | -3.11E-09 | 3.14E-11 | -1.23E-13 |
| S31 | -4.60E-01 | 6.82E-07 | 7.17E-08 | -2.45E-10 | -5.66E-12 | 4.24E-14 |
TABLE 3
Table 4 lists the wide-angle end, telephoto end magnification variation data as follows:
| wide angle end | Long coke end | |
| T1 | 1.5 | 26.3 |
| T2 | 26.0 | 1.2 |
| T3 | 6.0 | 1.0 |
| T4 | 1.5 | 6.5 |
TABLE 4
As can be seen from fig. 2 to 9, according to the zoom lens of the present embodiment, with a structure of 18 lenses and three aspheric lenses, the zoom lens can achieve the effect of a constant aperture F1.4 and correcting the positional chromatic aberration and the magnification chromatic aberration between 380 nm and 940nm, and achieves the excellent confocal performance between 380 nm and 940 nm; meanwhile, under the high-low temperature environment of-40 ℃ to +80 ℃, the full 4K resolution can be met without refocusing. In addition, the advantages of small lens size, large aperture and suitability for more scenes with different conditions are achieved.
The second embodiment:
in this embodiment, the zoom lens of the present invention comprises 18 lens elements, wherein there are multiple cemented lens elements consisting of multiple lens elements, and the aperture stop S and the filter a comprise 34 optical surfaces, which are numbered as S1-S34 in sequence for convenience of description, wherein S14 is the aperture stop replaced by S, and the image plane IMA.
Table 5 below lists relevant parameters of each lens of the present embodiment, including surface type, radius of curvature (R value), thickness, refractive index of material, abbe number:
TABLE 5
Table 6 shows the aspherical surface coefficients of the aspherical lenses in the present embodiment, K is a conic constant of the surface, and A, B, C, D, E are aspherical surface coefficients of fourth order, sixth order, eighth order, tenth order, and twelfth order, respectively.
| Serial number | K | A | B | C | D | E |
| S15 | -1.19E+00 | -6.94E-06 | 4.98E-08 | -2.58E-10 | 8.70E-13 | -2.16E-15 |
| S16 | -1.66E+00 | 2.61E-05 | -1.48E-07 | 3.93E-09 | -4.65E-11 | 2.02E-13 |
| S31 | -5.20E+01 | -8.32E-06 | 2.86E-07 | -6.34E-09 | 6.40E-11 | -2.50E-13 |
| S32 | -1.41E+00 | 2.09E-06 | 2.20E-07 | -7.50E-10 | -1.73E-11 | 1.30E-13 |
TABLE 6
Table 7 lists the wide-angle end, telephoto end magnification variation data as follows:
| wide angle end | Long coke end | |
| T1 | 1.5 | 26.5 |
| T2 | 26.2 | 1.2 |
| T3 | 5.6 | 0.8 |
| T4 | 1.5 | 6.3 |
TABLE 7
With reference to fig. 11 to 18, it can be known that, in the zoom lens according to the present embodiment, when the zoom lens has a structure of 18 lenses and two aspheric lenses, the zoom lens can achieve the effects of keeping the aperture F1.4 constant and correcting the positional chromatic aberration and the magnification chromatic aberration between 380 nm and 940nm, thereby achieving excellent confocal performance between 380 nm and 940 nm; meanwhile, under the high-low temperature environment of-40 ℃ to +80 ℃, the full 4K resolution can be met without refocusing. In addition, the advantages of small lens size, large aperture and suitability for more scenes with different conditions are achieved.
The third embodiment is as follows:
in this embodiment, the zoom lens of the present invention comprises 18 lens elements, wherein there are multiple cemented lens elements consisting of multiple lens elements, and the aperture stop S and the filter a comprise 34 optical surfaces, which are numbered as S1-S33 in sequence for convenience of description, wherein S13 is the aperture stop replaced by S, and the image plane IMA.
Table 8 below lists relevant parameters of each lens of the present embodiment, including surface type, radius of curvature (R value), thickness, refractive index of material, abbe number:
TABLE 8
Table 9 shows the aspherical surface coefficients of the aspherical lenses in the present embodiment, K is a conic constant of the surface, and A, B, C, D, E are aspherical surface coefficients of fourth order, sixth order, eighth order, tenth order, and twelfth order, respectively.
| Serial number | K | A | B | C | D | E |
| S14 | -1.25E+00 | -7.29E-06 | 5.23E-08 | -2.71E-10 | 9.14E-13 | -2.27E-15 |
| S15 | -1.74E+00 | 2.74E-05 | -1.56E-07 | 4.13E-09 | -4.88E-11 | 2.12E-13 |
| S28 | -5.46E+01 | -8.74E-06 | 3.00E-07 | -6.66E-09 | 6.72E-11 | -2.63E-13 |
| S29 | -1.48E+00 | 2.19E-06 | 2.31E-07 | -7.88E-10 | -1.82E-11 | 1.36E-13 |
Table 9 table 10 lists the wide-angle end, telephoto end magnification variation data as follows:
| wide angle end | Long coke end | |
| T1 | 1.3 | 26.5 |
| T2 | 26.2 | 1.0 |
| T3 | 5.8 | 1.0 |
| T4 | 1.5 | 6.3 |
Watch 10
As can be seen from fig. 20 to 27, in the zoom lens according to the present embodiment, when the zoom lens has a structure of 18 lenses and two aspheric lenses, the zoom lens can achieve the effect of constant aperture F1.4 and correcting the positional chromatic aberration and the magnification chromatic aberration between 380 nm and 940nm, and achieve excellent confocal performance between 380 nm and 940 nm; meanwhile, under the high-low temperature environment of-40 ℃ to +80 ℃, the full 4K resolution can be met without refocusing. In addition, the advantages of small lens size, large aperture and suitability for more scenes with different conditions are achieved.
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 (16)
1. A zoom lens characterized by comprising, in order in an object-side to image-side direction, a first fixed lens group (G1) having positive power, a zoom lens group (G2) having negative power, an aperture stop (S), a second fixed lens group (G3) having positive power, a focusing lens group (G4) having positive power, a third fixed lens group (G5) having positive power;
the zoom lens group (G2) is movable in an optical axis direction for optical zooming of the zoom lens between a wide-angle end and a telephoto end, and the focus lens group (G4) is movable in the optical axis direction for compensating for a variation in an image plane position during the optical zooming;
the diameter of the zoom lens
And the total optical length TTL of the zoom lens meets the following requirements:
2. the zoom lens according to claim 1, wherein the first fixed lens group (G1) includes, in order in an object-to-image direction: a first lens (L1) having a negative optical power, a second lens (L2) having a positive optical power, a third lens (L3) having a positive optical power;
the first lens (L1) and the second lens (L2) constitute a cemented lens group.
3. The zoom lens according to claim 2, wherein the first lens (L1) is a lens having a convex object side and a concave image side, the second lens (L2) is a lens having a convex object side, and the third lens (L3) is a lens having a convex object side.
4. The zoom lens according to claim 1, wherein the zoom lens group (G2) comprises, in order in an object-to-image direction: a fourth lens (L4) having a negative power, a fifth lens (L5) having a negative power, a sixth lens (L6) having a positive power, and a seventh lens (L7) having a negative power.
5. The zoom lens according to claim 4, wherein the fourth lens (L4) is a lens having a concave image side, and the fifth lens (L5) is a lens having a concave object side.
6. The zoom lens according to claim 1, wherein the second fixed lens group (G3) includes, in order in an object-to-image direction: an eighth lens (L8) having positive optical power, a ninth lens (L9) having negative optical power, a tenth lens (L10) having positive optical power, an eleventh lens (L11) having negative optical power, a twelfth lens (L12) having positive optical power, and a thirteenth lens (L13) having negative optical power.
7. The zoom lens according to claim 6, wherein the eighth lens (L8) is a lens having a convex object side, the ninth lens (L9) and the eleventh lens (L11) are lenses having a concave image side, the tenth lens (L10) and the twelfth lens (L12) are double convex lenses, and the thirteenth lens (L13) is a double concave lens.
8. The zoom lens according to claim 1, wherein the focusing lens group (G4) comprises, in order in an object-to-image direction: a fourteenth lens (L14) having a positive power, a fifteenth lens (L15) having a negative power, and a sixteenth lens (L16) having a positive power.
9. The zoom lens according to claim 8, wherein the fourteenth lens (L14) is a lens having a convex object side, and the sixteenth lens (L16) is a lens having a convex image side.
10. The zoom lens according to claim 1, wherein the third fixed lens group (G5) includes, in order in an object-to-image direction: a seventeenth lens (L17) having a positive or negative power, and an eighteenth lens (L18) having a positive or negative power.
11. The zoom lens according to claim 10, wherein the seventeenth lens (L17) is a meniscus or biconvex lens, and the eighteenth lens (L18) is a meniscus or meniscus lens.
12. The zoom lens according to any one of claims 1 to 11, wherein the zoom lens comprises at least two aspheric lenses, and at least one of the aspheric lenses is made of plastic material.
13. A zoom lens according to any one of claims 1 to 11, wherein the zoom lens includes at least three groups of cemented lens groups composed of a plurality of lenses.
14. A zoom lens according to any one of claims 1 to 11, wherein the first fixed lens group (G1) has a focal length FG1, the zoom lens group (G2) has a focal length FG2, the second fixed lens group (G3) has a focal length FG3, the focusing lens group (G4) has a focal length FG4, the third fixed lens group (G5) has a focal length FG5, and the zoom lens has a focal length FW at the wide-angle end, respectively, satisfying: FG1/Fw is more than or equal to 2.0 and less than or equal to 4.5, FG2/Fw is more than or equal to-1.7 and less than or equal to-0.8, FG3/Fw is more than or equal to 1.2 and less than or equal to 2.2, FG4/Fw is more than or equal to 2.0 and less than or equal to 3.3, and FG5/Fw is more than or equal to 10.
15. A zoom lens according to claim 6 or 7, wherein an Abbe number Vb8 of the eighth lens (L8) satisfies the following relationship: vb8 is more than or equal to 60 and less than or equal to 96.
16. The zoom lens according to claim 6 or 7, wherein the refractive indices of the eighth lens (L8), the tenth lens (L10), and the twelfth lens (L12) are Nd, and the following are satisfied: nd is less than or equal to 1.68.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011160830.2A CN112305731A (en) | 2020-10-27 | 2020-10-27 | Zoom lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011160830.2A CN112305731A (en) | 2020-10-27 | 2020-10-27 | Zoom lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112305731A true CN112305731A (en) | 2021-02-02 |
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ID=74330848
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011160830.2A Pending CN112305731A (en) | 2020-10-27 | 2020-10-27 | Zoom lens |
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| Country | Link |
|---|---|
| CN (1) | CN112305731A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114994887A (en) * | 2022-07-25 | 2022-09-02 | 浙江大华技术股份有限公司 | Lens and camera device |
| CN117130166A (en) * | 2023-10-26 | 2023-11-28 | 江西联昊光电有限公司 | Optical system and near-eye display device |
-
2020
- 2020-10-27 CN CN202011160830.2A patent/CN112305731A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114994887A (en) * | 2022-07-25 | 2022-09-02 | 浙江大华技术股份有限公司 | Lens and camera device |
| CN117130166A (en) * | 2023-10-26 | 2023-11-28 | 江西联昊光电有限公司 | Optical system and near-eye display device |
| CN117130166B (en) * | 2023-10-26 | 2024-03-15 | 江西联昊光电有限公司 | Optical system and near-eye display device |
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