CN111722384A - Zoom lens - Google Patents
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- CN111722384A CN111722384A CN202010734203.9A CN202010734203A CN111722384A CN 111722384 A CN111722384 A CN 111722384A CN 202010734203 A CN202010734203 A CN 202010734203A CN 111722384 A CN111722384 A CN 111722384A
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- 230000003287 optical effect Effects 0.000 claims abstract description 68
- 230000008859 change Effects 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims abstract description 3
- 230000008569 process Effects 0.000 claims abstract description 3
- 239000000463 material Substances 0.000 claims description 6
- 238000003384 imaging method Methods 0.000 description 9
- 230000002349 favourable effect Effects 0.000 description 5
- 239000000571 coke Substances 0.000 description 3
- 230000004075 alteration Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010226 confocal imaging Methods 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 239000005331 crown glasses (windows) Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000005308 flint glass Substances 0.000 description 2
- 238000005286 illumination Methods 0.000 description 2
- 238000002329 infrared spectrum Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 238000001429 visible spectrum Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 1
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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
- G02B15/177—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 negative front lens or group of lenses
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Abstract
The invention relates to a zoom lens, which comprises a first fixed group (1), a zoom group (2), a second fixed group (3), a focusing group (4) and an optical filter (5) which are sequentially arranged from an object side to an image side along an optical axis; the zoom group (2) is movable along the optical axis for optical zooming of the zoom lens between a wide-angle end and a telephoto end; the focusing group (4) can move along the optical axis and is used for correcting the image plane position change of the zooming group (2) in the zooming process; the focal length FA of the first fixed group (1), the focal length FB of the zoom group (2), the focal length FC of the second fixed group (3), the focal length FD of the focus group (4) satisfy: FA/FC is more than or equal to 1.45 and less than or equal to 3.25, FB/FC is more than or equal to 2.3 and less than or equal to-0.45, FD/FC is more than or equal to 1.10 and less than or equal to 3.45. The lens has small volume and large image surface, and can meet the use requirements of various types of camera equipment.
Description
Technical Field
The invention relates to the technical field of optical systems and device design, in particular to a zoom lens.
Background
With the development of AI face recognition technology, zoom lenses are favorable for further development of application space in the field. However, in the field of AI face recognition, a clearer image is required to achieve excellent recognition accuracy and processing efficiency. Therefore, higher requirements are put on the diaphragm, the image plane, the resolution, the infrared performance and the high and low temperature performance of the camera lens. However, the currently used lens generally has the following disadvantages: the aperture is small, and the requirement of an image on brightness in a low-illumination environment cannot be met; the large image plane and the small volume can not be considered at the same time, and the space requirement of the lens can not be met; the resolution ratio is low, the resolution ratio of the current mainstream 1080P lens is 200 ten thousand, and obviously, the requirement of face recognition on high pixels cannot be met; the infrared performance and the high and low temperature performance cannot be considered at the same time, and the requirement of day and night confocal performance is often met by sacrificing the high and low temperature performance, but the requirement of face identification on real-time performance in a high and low temperature environment cannot be met.
Disclosure of Invention
An object of the present invention is to provide a zoom lens capable of being applied to confocal 4K sharp imaging at day and night.
To achieve the above objective, the present invention provides a zoom lens, which includes a first fixed group, a zoom group, a second fixed group, a focus group and an optical filter sequentially arranged from an object side to an image side along an optical axis;
the zoom group is movable along the optical axis for optical zooming of the zoom lens between a wide-angle end and a telephoto end;
the focusing group can move along the optical axis and is used for correcting the image plane position change of the zooming group in the zooming process;
the focal length FA of the first fixed group, the focal length FB of the zooming group, the focal length FC of the second fixed group and the focal length FD of the focusing group satisfy: FA/FC is more than or equal to 1.45 and less than or equal to 3.25, FB/FC is more than or equal to 2.3 and less than or equal to-0.45, FD/FC is more than or equal to 1.10 and less than or equal to 3.45.
According to an aspect of the present invention, a wide-angle end focal length Fw of the zoom lens and a focal length FC of the second fixed group satisfy: Fw/FC is more than or equal to 0.5 and less than or equal to 1.4.
According to one aspect of the invention, the first fixed group is positive optical power; the zoom group is negative focal power; the second fixed group is positive focal power; the focus group is of positive optical power.
According to an aspect of the invention, the first fixed group comprises, in order from the object side to the image side: the lens comprises a first lens with negative focal power, a second lens with positive focal power and a third lens with positive focal power.
According to one aspect of the invention, the zoom group comprises, in order from the object side to the image side: a fourth lens having a negative optical power; a fifth lens having a negative optical power; a sixth lens having a positive optical power.
According to an aspect of the invention, the second fixed group comprises, in order from the object side to the image side: a seventh lens having positive optical power; an eighth lens having positive optical power; a ninth lens having positive optical power; a tenth lens having a negative optical power.
According to an aspect of the present invention, the focus group includes, in order from an object side to an image side: an eleventh lens having positive optical power; a twelfth lens having a positive or negative optical power; a thirteenth lens having positive or negative optical power; a fourteenth lens having a negative optical power; a fifteenth lens having positive optical power.
According to one aspect of the invention, the refractive index nd of the material of at least 1 lens in each of the first fixed group, the second fixed group and the focusing group satisfies: nd is more than or equal to 1.43 and less than or equal to 1.64, and the Abbe number vd of the lens material of the lens meets the following conditions: vd is more than or equal to 60 and less than or equal to 96.
According to an aspect of the present invention, at least 1 of the lenses included in the zoom lens is an aspheric lens, and both surfaces of the aspheric lens are aspheric surfaces.
According to an aspect of the present invention, the temperature coefficient of refraction a of at least 1 of the aspheric lenses satisfies: a. the<-8.0*10-5/℃。
According to an aspect of the present invention, the zoom lens includes at least 1 cemented lens cemented by adjacent lenses.
According to one aspect of the invention, the diameter phi of the target surface covered by the zoom lens and the total length TTL of the zoom lens satisfy that: phi/TTL is less than or equal to 0.27.
According to an aspect of the invention, further comprising a diaphragm, the diaphragm being located between the zoom group and the second fixed group.
According to one scheme of the invention, the number and volume distribution of the lenses among the lens groups are more reasonable, and the balance of the overall quality of the zoom lens is ensured. Meanwhile, the arrangement is favorable for reducing the assembly tolerance of the group assembly, and is favorable for improving the assembly property of the invention.
According to one scheme of the invention, the optimized distribution of the focal power of the group is realized, so that the overall length of the zoom lens is reduced while a larger field angle is ensured, the light transmission efficiency of the zoom lens is effectively improved, and the production cost of the zoom lens is effectively reduced.
According to one scheme of the invention, each lens meets the matching of the focal power, so that the zoom lens has excellent confocal imaging capability on visible and infrared spectrums, and meanwhile, the zoom lens can realize a temperature compensation function under different ambient temperatures, still has good resolution under a large aperture state and achieves a clear imaging effect.
According to one scheme of the invention, the lens realizes the correction of chromatic aberration and secondary spectrum of 420-940nm wave band by matching and combining crown glass and flint glass, and can ensure the resolution without refocusing during day and night switching.
According to one scheme of the invention, the lens is small in size and large in image surface, and can meet the use requirements of various types of camera equipment.
According to one scheme of the invention, the lens solves the problem of focus drift in high and low temperature environments on the premise of considering infrared performance, so that the lens is free of virtual focus in the temperature range of-40-80 ℃, is suitable for various high and low temperature environments, and greatly widens the application range of the lens.
Drawings
Fig. 1 is a structural view schematically showing a zoom lens according to embodiment 1 of the present invention;
fig. 2 is a wide-angle end MTF chart schematically showing a zoom lens according to embodiment 1 of the present invention under visible light;
FIG. 3 is a wide-angle end MTF chart in infrared light schematically showing the zoom lens according to embodiment 1 of the present invention;
FIG. 4 is a chart schematically showing an MTF at the telephoto end under visible light for the zoom lens according to embodiment 1 of the present invention;
FIG. 5 is a chart schematically showing an MTF at a telephoto end under infrared light in a zoom lens according to embodiment 1 of the present invention;
FIG. 6 is a structural view schematically showing a zoom lens according to embodiment 2 of the present invention;
fig. 7 is a view schematically showing MTF at the wide angle end under visible light of the zoom lens according to embodiment 2 of the present invention;
FIG. 8 is a chart schematically showing MTF at the wide angle end under infrared light of the zoom lens according to embodiment 2 of the present invention;
FIG. 9 is a chart schematically showing an MTF at the telephoto end under visible light for the zoom lens according to embodiment 2 of the present invention;
FIG. 10 is a chart schematically showing an MTF at a telephoto end under infrared light in a zoom lens according to embodiment 2 of the present invention;
FIG. 11 is a structural view schematically showing a zoom lens according to embodiment 3 of the present invention;
fig. 12 is a wide-angle end MTF chart schematically showing visible light of a zoom lens according to embodiment 3 of the present invention;
fig. 13 is a wide-angle end MTF chart schematically showing an infrared light zoom lens according to embodiment 3 of the present invention;
FIG. 14 is a chart schematically showing an MTF at the telephoto end under visible light for the zoom lens according to embodiment 3 of the present invention;
fig. 15 is a chart schematically showing an MTF at the telephoto end under infrared light of the zoom lens according to embodiment 3 of the present invention.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
In describing embodiments of the present invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship that is based on the orientation or positional relationship shown in the associated drawings, which is for convenience and simplicity of description only, and does not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, the above-described terms should not be construed as limiting the present invention.
The present invention is described in detail below with reference to the drawings and the specific embodiments, which are not repeated herein, but the embodiments of the present invention are not limited to the following embodiments.
As shown in fig. 1, a zoom lens according to the present invention includes a first fixed group 1, a zoom group 2, a second fixed group 3, a focus group 4 and a filter 5 arranged in sequence from an object side to an image side along an optical axis. In the present embodiment, the zoom group 2 is movable along the optical axis for optical zooming of the zoom lens between the wide-angle end and the telephoto end; the focusing group 4 is movable along the optical axis for correcting the image plane position variation of the zooming group 2 during zooming. In the present embodiment, the focal length FA of the first fixed group 1, the focal length FB of the zoom group 2, the focal length FC of the second fixed group 3, and the focal length FD of the focus group 4 satisfy: FA/FC is more than or equal to 1.45 and less than or equal to 3.25, FB/FC is more than or equal to 2.3 and less than or equal to-0.45, FD/FC is more than or equal to 1.10 and less than or equal to 3.45.
As shown in fig. 1, according to a zoom lens of the present invention, a wide-angle end focal length Fw and a focal length FC of the second fixed group 3 of the zoom lens satisfy: Fw/FC is more than or equal to 0.5 and less than or equal to 1.4. In the present embodiment, the zoom group 2 is moved from the object side to the image side along the optical axis, and the magnification change (zooming) of the zoom lens of the present invention from the wide-angle end to the telephoto end is realized.
Through the arrangement, the number and the volume distribution of the lenses among the lens groups are more reasonable, and the balance of the overall quality of the zoom lens is ensured. Meanwhile, the arrangement is favorable for reducing the assembly tolerance of the group assembly, and is favorable for improving the assembly property of the invention.
Through the arrangement, the optimal distribution of the focal power of the group is realized, so that the overall length of the zoom lens is reduced while a larger field angle is ensured, the light transmission efficiency of the zoom lens is effectively improved, and the production cost of the zoom lens is effectively reduced.
As shown in FIG. 1, according to a zoom lens of the present invention, the first fixed group 1 has positive optical power; the zoom group 2 has negative focal power; the second fixed group 3 is positive focal power; the focus group 4 is of positive power.
As shown in fig. 1, the zoom lens according to the present invention, in order from an object side to an image side, comprises a first fixed group 1: a first lens 11 having a negative power, a second lens 12 having a positive power, and a third lens 13 having a positive power.
As shown in fig. 1, a zoom lens according to the present invention, in order from an object side to an image side, comprises: a fourth lens 21 having a negative power; a fifth lens 22 having a negative power; and a sixth lens 23 having a positive optical power.
As shown in fig. 1, the zoom lens according to the present invention, in order from an object side to an image side, comprises a second fixed group 3: a seventh lens 31 having positive optical power; an eighth lens 32 having positive optical power; a ninth lens 33 having positive optical power; a tenth lens 34 having a negative power.
As shown in fig. 1, a zoom lens according to the present invention, in order from an object side to an image side, comprises a focus group 4: an eleventh lens 41 having positive optical power; a twelfth lens 42 having positive or negative optical power; a thirteenth lens 43 having positive or negative optical power; a fourteenth lens 44 having a negative optical power; a fifteenth lens 45 having positive optical power.
Through the zoom lens, all lenses of the zoom lens meet the matching of the focal power, so that the zoom lens has excellent confocal imaging capability on visible and infrared spectrums, and meanwhile, through the arrangement, the zoom lens can realize a temperature compensation function under different ambient temperatures, still has good resolution under a large aperture state, and achieves a clear imaging effect.
As shown in fig. 1, in a zoom lens according to the present invention, refractive indexes nd of materials of at least 1 lens in each of a first fixed group 1, a second fixed group 3 and a focus group 4 satisfy: nd is more than or equal to 1.43 and less than or equal to 1.64, and the Abbe number vd of the lens material of the lens meets the following conditions: vd is more than or equal to 60 and less than or equal to 96.
As shown in fig. 1, according to a zoom lens of the present invention, at least 1 of the lenses included in the zoom lens is an aspheric lens, and both surfaces of the aspheric lens are aspheric. In the present embodiment, the temperature coefficient of refractive index a of at least 1 of the aspherical lenses satisfies: a. the<-8.0*10-5/℃。
Through the arrangement, the lens realizes the correction of chromatic aberration and secondary spectrum of the 420-one 940nm wave band by matching and combining the crown glass and the flint glass, and can ensure the resolving power without refocusing during day and night switching.
As shown in fig. 1, a zoom lens according to the present invention includes at least 1 cemented lens formed by cemented neighboring lenses.
As shown in fig. 1, according to a zoom lens of the present invention, a diameter Φ of a target surface covered by the zoom lens and a total length TTL of the zoom lens satisfy: phi/TTL is less than or equal to 0.27.
Through the arrangement, the lens disclosed by the invention is small in size and large in image surface, and can meet the use requirements of various types of camera equipment.
As shown in fig. 1, a zoom lens according to the present invention further includes a stop S located between the zoom group 2 and the second fixed group 3. In the present embodiment, the diaphragm S is an iris diaphragm. Through the arrangement, the diaphragm is arranged behind the zooming group, the rear position of the diaphragm is realized, and the maximum aperture of the zoom lens can reach F1.4 under the condition of adopting the variable diaphragm, so that the light inlet quantity of the zoom lens in a low-illumination environment is sufficient, and the brightness of a formed image is ensured.
Through the arrangement, the lens solves the problem of focus drift in high and low temperature environments on the premise of considering infrared performance, so that the lens does not generate virtual focus in the temperature range of-40-80 ℃, is suitable for various high and low temperature environments, and greatly widens the application range of the lens.
The zoom lens according to the present invention is specifically described below using three sets of embodiments. The data for three sets of examples are shown in table 1 below:
| detailed description of the preferred embodiment | Detailed description of the invention | Detailed description of the preferred embodiment | |
| FA/FC | 1.63 | 3.21 | 1.48 |
| FB/FC | -0.563 | -2.23 | -0.46 |
| FD/FC | 1.20 | 3.27 | 3.43 |
| Fw/FC | 1.36 | 1.38 | 0.524 |
| Number of cemented |
3 | 2 | 4 |
TABLE 1
As can be seen from Table 1, the settings of the parameters in the zoom lens according to the three groups of embodiments of the present invention satisfy the requirements of the zoom lens according to the present invention for the conditions of the parameters.
Fig. 1 is a structural view schematically showing a zoom lens according to embodiment 1 of the present invention. As shown in fig. 1, in the present embodiment, the first fixed group 1 of the zoom lens includes three lenses, the zoom group 2 includes three lenses, the second fixed group 3 includes four lenses, and the focus group 4 includes five lenses. For convenience of description, the number is given according to the number of optical surfaces, and since a cemented lens constructed by cementing a plurality of lenses is provided, one number is given to the cemented surface. Therefore, the numbers are S1-S27 in this embodiment. Further, the imaging system using the zoom lens of the present invention further includes a stop surface STO, filter surfaces S28 and S29, and an imaging surface IMA.
Table 2 below lists relevant parameters for each lens, including surface type, radius of curvature, thickness, refractive index, abbe number:
TABLE 2
The following table 3 lists the aspherical 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 coefficients of fourth order, sixth order, eighth order, tenth order, and twelfth order, respectively:
TABLE 3
The following table 4 lists the variable magnification data of the wide angle end and the telephoto end in this embodiment:
| wide angle end | Long coke end | |
| Z1 | 1.083 | 12.673 |
| Z2 | 11.776 | 0.186 |
| Z3 | 3.824 | 2.598 |
| Z4 | 0.705 | 1.931 |
TABLE 4
The seventh lens 31 of the zoom lens is a lens whose both surfaces are aspherical. The aspherical surface satisfies the following formula:
in the formula, z is the axial distance from the curved surface to the vertex at the position which is along the direction of the optical axis and is vertical to the optical axis by the height h; c represents the curvature at the apex of the aspherical surface; k is a conic coefficient; a. the4、A6、A8、A10、A12Respectively representing aspheric coefficients of fourth order, sixth order, eighth order and twelfth order.
As can be seen from tables 1, 2, 3, and 4, in the present embodiment, the setting of the lens-related parameters satisfies the condition requirements of the zoom lens of the present invention. Fig. 2 to 5 are MTF charts schematically representing the wide angle end and the telephoto end, respectively, of the zoom lens according to embodiment 1 of the present invention. As can be seen from fig. 2 to 5, the zoom lens of the present invention is arranged according to the relevant parameters of each lens in embodiment 1, so that the zoom lens of the present invention has the advantages of infrared visible confocal property, large zoom magnification, realization of F1.4 large aperture, small volume, large target surface, full focal length segment of day and night confocal property, no virtual focus in the temperature range of-40 ℃ to 80 ℃, and the like.
Fig. 6 is a block diagram schematically showing a zoom lens according to embodiment 2 of the present invention at the wide-angle end. As shown in fig. 6, in the present embodiment, the first fixed group 1 of the zoom lens includes three lenses, the zoom group 2 includes three lenses, the second fixed group 3 includes four lenses, and the focus group 4 includes five lenses. For convenience of description, the number is given according to the number of optical surfaces, and since a cemented lens constructed by cementing a plurality of lenses is provided, one number is given to the cemented surface. Therefore, the numbers are S1-S28 in this embodiment. The imaging system using the zoom lens of the present invention further includes a stop surface STO, filter surfaces S29 and S30, and an imaging surface IMA.
Table 5 below lists relevant parameters for each lens, including surface type, radius of curvature, thickness, refractive index, abbe number:
TABLE 5
The following table 6 lists the aspherical 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 coefficients of fourth order, sixth order, eighth order, tenth order, and twelfth order, respectively:
table 6 the following table 7 lists the variable magnification data at the wide angle end and the telephoto end in this embodiment:
| wide angle end | Long coke end | |
| Z1 | 1.583 | 12.156 |
| Z2 | 10.759 | 0.186 |
| Z3 | 3.482 | 2.256 |
| Z4 | 4.287 | 5.513 |
TABLE 7
The eighth lens 32 of the zoom lens is a lens whose both surfaces are aspheric, and the thirteenth lens 43 is also a lens whose both surfaces are aspheric. The aspherical surface satisfies the following formula:
in the formula, z is the axial distance from the curved surface to the vertex at the position which is along the direction of the optical axis and is vertical to the optical axis by the height h; c represents the curvature at the apex of the aspherical surface; k is a conic coefficient; a. the4、A6、A8、A10、A12Respectively representing aspheric coefficients of fourth order, sixth order, eighth order and twelfth order.
As is clear from tables 1, 5, 6, and 7, in the present embodiment, the setting of the lens-related parameters satisfies the condition requirements of the zoom lens of the present invention. Fig. 7 to 10 are MTF charts schematically representing the wide angle end and the telephoto end, respectively, of the zoom lens according to embodiment 2 of the present invention. As can be seen from fig. 7 to 10, the zoom lens of the present invention is arranged according to the relevant parameters of each lens in embodiment 2, so that the zoom lens of the present invention has the advantages of infrared visible confocal property, large zoom magnification, realization of F1.38 large aperture, small volume, large target surface, full focal length segment of day and night confocal property, no virtual focus in the temperature range of-40 ℃ to 80 ℃, and the like.
Fig. 11 is a block diagram schematically showing a zoom lens according to embodiment 3 of the present invention at the wide-angle end. As shown in fig. 11, in the present embodiment, the first fixed group 1 of the zoom lens includes three lenses, the zoom group 2 includes three lenses, the second fixed group 3 includes four lenses, and the focus group 4 includes five lenses. For convenience of description, the number is given according to the number of optical surfaces, and since a cemented lens constructed by cementing a plurality of lenses is provided, one number is given to the cemented surface. Therefore, the numbers are S1-S26 in this embodiment. The imaging system using the zoom lens of the present invention further includes a stop surface STO, filter surfaces S27 and S28, and an imaging surface IMA.
Table 8 below lists the relevant parameters for each lens, including surface type, radius of curvature, thickness, refractive index,Abbe of Abbe Number:
TABLE 8
The following table 9 lists 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.
Table 9 the following table 10 lists the variable magnification data at the wide angle end and the telephoto end in this embodiment:
| wide angle end | Long coke end | |
| Z1 | 0.759 | 12.349 |
| Z2 | 12.300 | 0.71 |
| Z3 | 3.482 | 0.856 |
| Z4 | 0.905 | 3.531 |
The seventh lens 31 of the zoom lens is a lens whose both surfaces are aspheric, and the fifteenth lens 45 is also a lens whose both surfaces are aspheric. The aspherical surface satisfies the following formula:
in the formula, z is the axial distance from the curved surface to the vertex at the position which is along the direction of the optical axis and is vertical to the optical axis by the height h; c represents the curvature at the apex of the aspherical surface; k is a conic coefficient; a. the4、A6、A8、A10、A12Respectively representing aspheric coefficients of fourth order, sixth order, eighth order and twelfth order.
As is clear from tables 1, 8, 9, and 10, in the present embodiment, the setting of the lens-related parameters satisfies the condition requirements of the zoom lens of the present invention. Fig. 12 to 15 are MTF charts schematically representing the wide angle end and the telephoto end, respectively, of the zoom lens according to embodiment 3 of the present invention. As can be seen from fig. 12 to 15, the zoom lens of the present invention is arranged according to the relevant parameters of each lens in embodiment 3, so that the zoom lens of the present invention has the advantages of infrared visible confocal property, large zoom magnification, realization of F1.4 large aperture, small volume, large target surface, full focal length segment of day and night confocal property, no virtual focus in the temperature range of-40 ℃ to 80 ℃, and the like.
The foregoing is merely exemplary of particular aspects of the present invention and devices and structures not specifically described herein are understood to be those of ordinary skill in the art and are intended to be implemented in such conventional ways.
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 (13)
1. A zoom lens is characterized by comprising a first fixed group (1), a zoom group (2), a second fixed group (3), a focusing group (4) and an optical filter (5) which are sequentially arranged from an object side to an image side along an optical axis;
the zoom group (2) is movable along the optical axis for optical zooming of the zoom lens between a wide-angle end and a telephoto end;
the focusing group (4) can move along the optical axis and is used for correcting the image plane position change of the zooming group (2) in the zooming process;
the focal length FA of the first fixed group (1), the focal length FB of the zoom group (2), the focal length FC of the second fixed group (3), the focal length FD of the focus group (4) satisfy: FA/FC is more than or equal to 1.45 and less than or equal to 3.25, FB/FC is more than or equal to 2.3 and less than or equal to-0.45, FD/FC is more than or equal to 1.10 and less than or equal to 3.45.
2. A zoom lens according to claim 1, wherein the wide-angle end focal length Fw of the zoom lens and the focal length FC of the second fixed group (3) satisfy: Fw/FC is more than or equal to 0.5 and less than or equal to 1.4.
3. A zoom lens according to claim 1, wherein the first fixed group (1) is of positive optical power; the zoom group (2) is of negative focal power; the second fixed group (3) is of positive optical power; the focus group (4) is of positive optical power.
4. A zoom lens according to any one of claims 1 to 3, wherein the first fixed group (1) comprises, in order from the object side to the image side: a first lens (11) having a negative refractive power, a second lens (12) having a positive refractive power, and a third lens (13) having a positive refractive power.
5. A zoom lens according to any one of claims 1 to 3, wherein the zoom group (2) comprises, in order from the object side to the image side: a fourth lens (21) having a negative optical power; a fifth lens (22) having a negative optical power; a sixth lens (23) having a positive optical power.
6. A zoom lens according to any one of claims 1 to 3, wherein the second fixed group (3) comprises, in order from the object side to the image side: a seventh lens (31) having a positive optical power; an eighth lens (32) having a positive optical power; a ninth lens (33) having positive optical power; a tenth lens (34) having a negative optical power.
7. A zoom lens according to any one of claims 1 to 3, wherein the focus group (4) comprises, in order from the object side to the image side: an eleventh lens (41) having positive optical power; a twelfth lens (42) having a positive or negative optical power; a thirteenth lens (43) having a positive or negative optical power; a fourteenth lens (44) having a negative power; a fifteenth lens (45) having a positive optical power.
8. A zoom lens according to any one of claims 1 to 7, wherein the refractive indices nd of the materials of at least 1 lens of the first fixed group (1), the second fixed group (3) and the focus group (4) satisfy: nd is more than or equal to 1.43 and less than or equal to 1.64, and the Abbe number vd of the lens material of the lens meets the following conditions: vd is more than or equal to 60 and less than or equal to 96.
9. The zoom lens according to any one of claims 1 to 7, wherein at least 1 of the lenses included in the zoom lens is an aspherical lens, and both surfaces of the aspherical lens are aspherical.
10. The zoom lens according to claim 9, wherein the temperature coefficient of refractive index a of at least 1 of the aspherical lenses satisfies: a. the<-8.0*10-5/℃。
11. A zoom lens according to any one of claims 1 to 3, wherein the zoom lens includes at least 1 cemented lens cemented by adjacent lenses.
12. The zoom lens according to any one of claims 1 to 3, wherein a diameter φ of a target surface covered by the zoom lens and a total length TTL of the zoom lens satisfy: phi/TTL is less than or equal to 0.27.
13. A zoom lens according to claim 1, further comprising a stop located between the zoom group (2) and the second fixed group (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010734203.9A CN111722384A (en) | 2020-07-27 | 2020-07-27 | Zoom lens |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010734203.9A CN111722384A (en) | 2020-07-27 | 2020-07-27 | Zoom lens |
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| Publication Number | Publication Date |
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| CN111722384A true CN111722384A (en) | 2020-09-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010734203.9A Pending CN111722384A (en) | 2020-07-27 | 2020-07-27 | Zoom lens |
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| CN (1) | CN111722384A (en) |
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| CN113296252A (en) * | 2021-05-24 | 2021-08-24 | 江西凤凰光学科技有限公司 | Zoom lens |
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