CN114994879B - Unmanned aerial vehicle camera lens - Google Patents
Unmanned aerial vehicle camera lens Download PDFInfo
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- CN114994879B CN114994879B CN202210822709.4A CN202210822709A CN114994879B CN 114994879 B CN114994879 B CN 114994879B CN 202210822709 A CN202210822709 A CN 202210822709A CN 114994879 B CN114994879 B CN 114994879B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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- G—PHYSICS
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
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Abstract
The invention relates to an unmanned aerial vehicle lens, along the direction from the object side to the image side of the optical axis, include in proper order: the optical focusing device comprises a fixed group with positive focal power and a focusing group, wherein when the object distance changes, the focusing group moves along an optical axis to focus, the fixed group comprises a first lens (L1), a second lens (L2), a third lens (L3), a diaphragm, a fourth lens (L4), a fifth lens (L5), a sixth lens (L6) and a seventh lens (L7) which are sequentially arranged, the focusing group has negative focal power, and the focusing group comprises an eighth lens (L8) and a ninth lens (L9) which are sequentially arranged. The unmanned aerial vehicle lens realizes clear imaging with the object distance of infinite to 0.4m, has the characteristics of miniaturization, low production cost, low distortion and large target surface, can meet the high resolution of more than two tens of millions of pixels, and has no virtual focus in the temperature range of minus 40 ℃ to plus 85 ℃.
Description
Technical Field
The invention relates to the technical field of imaging optics, in particular to an unmanned aerial vehicle lens.
Background
Along with the promotion of unmanned aerial vehicle technique, unmanned aerial vehicle application range is more and more extensive, but present unmanned aerial vehicle camera lens has various defects, for example, the processing degree of difficulty is great, and the structure is lengthy, does not satisfy miniaturized development trend. Moreover, the resolution ratio of the image is not high during aerial photography, so that the image is not clear, the distortion of the aerial photography lens is large, the image is deformed, the requirements of small volume, high pixels, large target surface and low distortion cannot be met, and the application scene is limited.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide an unmanned aerial vehicle lens which can meet clear imaging with an object distance of infinity to 0.4m and has no virtual focus in a temperature range of-40 ℃ to +85 ℃.
In order to achieve the above object, the present invention provides an unmanned aerial vehicle lens, comprising, in order along an optical axis from an object side to an image side: the focusing lens comprises a fixed group with positive focal power and a focusing group, wherein when the object distance changes, the focusing group moves along the optical axis to focus, the fixed group comprises a first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens, a sixth lens and a seventh lens which are sequentially arranged, the focusing group has negative focal power, and the focusing group comprises an eighth lens and a ninth lens which are sequentially arranged.
According to one aspect of the present invention, the first lens, the second lens, the fifth lens, and the eighth lens have negative optical power;
the third lens, the fourth lens, the sixth lens, and the seventh lens have positive optical power;
the ninth lens has positive or negative optical power.
According to one aspect of the invention, the optical axis is oriented in a direction from the object side to the image side,
the first lens and the ninth lens are convex-concave lenses;
the second lens and the seventh lens are both concave-convex lenses;
the third lens, the fourth lens and the sixth lens are all convex-convex lenses;
the fifth lens is a concave lens;
the eighth lens is a concave-concave lens or a concave-convex lens.
According to one aspect of the present invention, the first lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the eighth lens are spherical lenses;
the second lens, the seventh lens and the ninth lens are all aspherical lenses.
According to one aspect of the present invention, the first lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the eighth lens are all glass lenses;
the second lens, the seventh lens and the ninth lens are all plastic lenses.
According to one aspect of the invention, the fourth lens and the fifth lens are cemented to form a cemented doublet.
According to one aspect of the invention, the following conditional expression is satisfied between the focal length F45 of the doublet lens and the focal length F of the unmanned aerial vehicle lens: -2.7.ltoreq.F45/F.ltoreq.1.1.
According to one aspect of the invention, the refractive index Nd of the third lens 3 And Abbe number Vd 3 The following conditional expressions are satisfied, respectively: nd is more than or equal to 1.58 3 ≤1.63；60≤Vd 3 ≤70。
According to one aspect of the invention, the refractive index Nd of the fifth lens 5 And Abbe number Vd 5 The following conditional expressions are satisfied, respectively: nd is more than or equal to 1.8 5 ≤1.95；20≤Vd 5 ≤40。
According to one aspect of the present invention, the following conditional expression is satisfied between the focal length F of the unmanned aerial vehicle lens and the total length TTL of the unmanned aerial vehicle lens: F/TTL is more than or equal to 0.32 and less than or equal to 0.38.
According to one aspect of the invention, the following conditional expression is satisfied between the total length TTL of the unmanned aerial vehicle lens and the focal length Fg of the fixed group: TTL/Fg is less than or equal to 3.3 and less than or equal to 3.9.
According to one aspect of the invention, the following conditional expression is satisfied between the focal length F of the unmanned aerial vehicle lens and the focal length Fg of the fixed group: F/Fg is more than or equal to 1.1 and less than or equal to 1.4.
According to one aspect of the invention, the following conditional expression is satisfied between the focal length F of the unmanned aerial vehicle lens and the focal length Ft of the focusing group: F/Ft is less than or equal to-0.7 and less than or equal to-0.4.
According to the scheme of the invention, an internal focusing mode of a first fixed group (i.e. a fixed group) with positive focal power and a second focusing group (i.e. a focusing group) with negative focal power is adopted, so that the focusing stability and speed of the unmanned aerial vehicle lens are improved, and the lens can realize clear imaging from infinity to 0.4 m. The positive and negative focal powers of the lenses are optimally configured and matched with different shapes of the lenses, so that aberration is effectively corrected, the lens has the characteristics of miniaturization, low distortion and large target surface, high resolution of more than two tens of millions of pixels can be met, and clear imaging can be realized in a temperature range of-40 ℃ to +85 ℃.
According to one scheme of the invention, an optical architecture of nine lenses and two lens groups is adopted, and a specific combination of the plastic aspherical lens and the glass spherical lens is adopted in a mixed mode, so that on one hand, the defect that the plastic aspherical lens is easy to cause focus drift in different environments with high and low temperatures due to large expansion coefficient is overcome, the lens is free from virtual focus in different temperature environments, and the imaging performance of the lens in a temperature range of-40 ℃ to +85 ℃ is improved. On the other hand, the use of three plastic aspherical lenses reduces the production cost of the lens.
According to the invention, the double-cemented lens formed by the fourth lens and the fifth lens and the relation between the focal length of the double-cemented lens and the focal length of the unmanned aerial vehicle lens and the range thereof are limited, so that tolerance sensitivity of the lens unit due to inclination/core shift and the like generated in the assembling process can be reduced, assembling parts between the lenses can be reduced, working procedures can be reduced, and cost can be reduced.
According to one aspect of the present invention, the refractive index Nd of the third lens 3 And Abbe number Vd 3 The following conditional expressions are satisfied, respectively: nd is more than or equal to 1.58 3 ≤1.63；60≤Vd 3 Less than or equal to 70, and is more beneficial to the optical system not to be in the virtual focus within the temperature range of minus 40 ℃ to +85 ℃.
According to one aspect of the present invention, the refractive index Nd of the fifth lens 5 And Abbe number Vd 5 The following conditional expressions are satisfied, respectively: nd is more than or equal to 1.8 5 ≤1.95；20≤Vd 5 And the aberration on the axis of the optical lens is favorably compensated and the imaging quality of the unmanned aerial vehicle lens is further improved by less than or equal to 40.
According to one aspect of the present invention, the following conditional expression is satisfied between the focal length F of the unmanned aerial vehicle lens and the total length TTL of the unmanned aerial vehicle lens: F/TTL is more than or equal to 0.32 and less than or equal to 0.38, which is beneficial to the miniaturization of the size of the unmanned aerial vehicle lens and the improvement of the resolution of the lens.
According to one aspect of the present invention, the following conditional expression is satisfied between the total length TTL of the unmanned aerial vehicle lens and the focal length Fg of the fixed group: TTL/Fg is less than or equal to 3.3 and less than or equal to 3.9, which is beneficial to improving the resolution of the lens and reducing the sensitivity of the lens.
According to one scheme of the invention, the focal length F of the unmanned aerial vehicle lens, the focal length Fg of the fixed group and the focal length Ft of the focusing group respectively meet the following conditional expressions: F/Fg is more than or equal to 1.1 and less than or equal to 1.4; F/Ft is less than or equal to 0.7 and less than or equal to-0.4, so that various aberrations of the optical lens are sufficiently corrected, the optical lens is compact in structure, and meanwhile, the resolution of lens imaging can be improved, distortion can be optimized, and optical performances such as a Chief Ray Angle (CRA) can be optimized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments will be briefly described below. It is evident that the drawings in the following description are only some embodiments of the present invention and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.
Fig. 1 schematically illustrates a structural diagram of a lens of an unmanned aerial vehicle according to a first embodiment of the present invention;
fig. 2 schematically illustrates a structural diagram of a lens of an unmanned aerial vehicle according to a second embodiment of the present invention;
fig. 3 schematically illustrates a structural diagram of a lens of an unmanned aerial vehicle according to a third embodiment of the present invention;
fig. 4 schematically illustrates a structural diagram of a lens of an unmanned aerial vehicle according to a fourth embodiment of the present invention.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
The description of the embodiments of this specification should be taken in conjunction with the accompanying drawings, which are a complete description of the embodiments. In the drawings, the shape or thickness of the embodiments may be enlarged and indicated simply or conveniently. Furthermore, portions of the structures in the drawings will be described in terms of separate descriptions, and it should be noted that elements not shown or described in the drawings are in a form known to those of ordinary skill in the art.
Any references to directions and orientations in the description of the embodiments herein are for convenience only and should not be construed as limiting the scope of the invention in any way. The following description of the preferred embodiments will refer to combinations of features which may be present alone or in combination, and the invention is not particularly limited to the preferred embodiments. The scope of the invention is defined by the claims.
Referring to fig. 1, an unmanned aerial vehicle lens provided by an embodiment of the present invention sequentially includes, along a direction from an object side to an image side of an optical axis: a fixed group having positive optical power and a focusing group having negative optical power. The fixed group comprises a first lens L1, a second lens L2, a third lens L3, a diaphragm, a fourth lens L4, a fifth lens L5, a sixth lens L6 and a seventh lens L7 which are sequentially arranged, and the focusing group comprises an eighth lens L8 and a ninth lens L9 which are sequentially arranged. When the object distance changes, the focusing group can move along the optical axis to focus.
In the embodiment of the present invention, the first lens L1, the second lens L2, the fifth lens L5 and the eighth lens L8 each have negative optical power, the third lens L3, the fourth lens L4, the sixth lens L6 and the seventh lens L7 each have positive optical power, and the ninth lens L9 has either positive optical power or negative optical power.
In the embodiment of the invention, the object-side surfaces of the first lens element L1 and the ninth lens element L9 are convex, and the image-side surfaces thereof are concave. The object-side surfaces of the second lens element L2 and the seventh lens element L7 are concave, and the image-side surfaces thereof are convex. The shapes of the object side surface and the image side surface of the third lens L3, the fourth lens L4, and the sixth lens L6 are convex. The shape of the object side surface and the image side surface of the fifth lens element L5 is concave. The eighth lens element L8 has a concave object-side surface and a concave or convex image-side surface.
According to the lens groups with different positive and negative focal powers and the lens combination thereof in the unmanned aerial vehicle lens, specifically, an internal focusing mode of a first fixed group with positive focal power (i.e. a fixed group) and a second focusing group with negative focal power (i.e. a focusing group) is adopted, so that the focusing stability and speed of the unmanned aerial vehicle lens are improved, and the lens can realize clear imaging with an object distance of infinity to 0.4 m. The positive and negative focal powers of the lenses are optimally configured and matched with different shapes of the lenses, so that aberration is effectively corrected, the lens has the characteristics of miniaturization, low distortion and large target surface, high resolution of more than two tens of millions of pixels can be met, and clear imaging can be realized in a temperature range of-40 ℃ to +85 ℃.
In the embodiment of the invention, the first lens L1, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the eighth lens L8 are all spherical lenses, and the second lens L2, the seventh lens L7 and the ninth lens L9 are all aspherical lenses.
In the embodiment of the invention, the first lens L1, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the eighth lens L8 are all glass lenses, and the second lens L2, the seventh lens L7 and the ninth lens L9 are all plastic lenses.
According to the unmanned aerial vehicle lens provided by the embodiment of the invention, an optical framework of nine lenses and two lens groups is adopted, and the specific plastic aspherical lens and the specific glass spherical lens are adopted in a mixed mode, so that on one hand, the defect that the plastic aspherical lens is easy to cause focus drift in different environments with high and low temperatures due to large expansion coefficient is overcome, the lens is free from virtual focus in different temperature environments, and the imaging performance of the lens in a temperature range of-40 ℃ to +85 ℃ is improved. On the other hand, the use of three plastic aspherical lenses reduces the production cost of the lens.
In the embodiment of the invention, the fourth lens L4 and the fifth lens L5 are cemented together to form a cemented doublet. Further, the following conditional expression is satisfied between the focal length F45 of the doublet lens and the focal length F of the unmanned aerial vehicle lens: -2.7.ltoreq.F45/F.ltoreq.1.1. The arrangement of the double-cemented lens and the limitation of the relation between the focal length of the double-cemented lens and the focal length of the unmanned aerial vehicle lens and the range thereof can reduce the tolerance sensitivity of the lens unit due to the inclination/core shift and the like generated in the assembly process, reduce the assembly parts between the lens and the lens, reduce the working procedures and reduce the cost.
In the embodiment of the invention, the refractive index Nd of the third lens L3 3 And Abbe number Vd 3 The following conditional expressions are satisfied, respectively: nd is more than or equal to 1.58 3 ≤1.63；60≤Vd 3 And is less than or equal to 70 percent. By adopting the third lens L3 of the specific refractive index and the dispersion coefficient, it is more advantageous that the optical system is free from the virtual focus in the temperature range of-40 ℃ to +85 ℃.
In the embodiment of the invention, the refractive index Nd of the fifth lens L5 5 And Abbe number Vd 5 The following conditional expressions are satisfied, respectively: nd is more than or equal to 1.8 5 ≤1.95；20≤Vd 5 And is less than or equal to 40. By the specific design of the refractive index and the dispersion coefficient of the fifth lens L5, on-axis aberration of the optical lens can be better compensated, and imaging quality of the unmanned aerial vehicle lens is further improved.
In the embodiment of the invention, the following conditional expression is satisfied between the focal length F of the unmanned aerial vehicle lens and the total length TTL of the unmanned aerial vehicle lens: F/TTL is more than or equal to 0.32 and less than or equal to 0.38. By meeting the conditional expression, the size of the unmanned aerial vehicle lens is miniaturized, and the resolution of the lens is improved.
In the embodiment of the invention, the following conditional expression is satisfied between the total length TTL of the unmanned aerial vehicle lens and the focal length Fg of the fixed group: TTL/Fg is less than or equal to 3.3 and less than or equal to 3.9. By setting the relation between the total length of the lens and the focal length of the fixed group, the lens resolution is improved, and the sensitivity of the lens is reduced.
In the embodiment of the invention, the following conditional expression is satisfied between the focal length F of the unmanned aerial vehicle lens and the focal length Fg of the fixed group: F/Fg is more than or equal to 1.1 and less than or equal to 1.4. The following conditional expression is satisfied between the focal length F of the unmanned aerial vehicle lens and the focal length Ft of the focusing group: F/Ft is less than or equal to-0.7 and less than or equal to-0.4. By setting the relation between the focal length of the fixed group and the focal length of the focusing group in the lens and the focal length of the lens and the range thereof, various aberrations of the optical lens are sufficiently corrected, and the optical lens has compact structure and can improve the resolution of imaging, optimize distortion, optimize optical properties such as Chief Ray Angle (CRA) and the like.
In summary, the unmanned aerial vehicle lens provided by the embodiment of the invention improves the focusing stability and speed of the unmanned aerial vehicle lens by adopting an internal focusing mode of a fixed group with positive focal power and a focusing group with negative focal power, so that the lens can realize clear imaging from infinity to 0.4 m. The positive and negative focal powers, focal lengths and materials of the lenses are optimally configured, and different shapes of the lenses are matched, so that various aberrations of the lenses are effectively corrected, on-axis aberrations are better compensated, tolerance sensitivity of the lens units and the lenses is reduced, the lenses have the characteristics of miniaturization, low production cost, low distortion and large target surface, high resolution of more than two tens of millions of pixels can be met, and clear imaging is realized in a temperature range of-40 ℃ to +85 ℃. Meanwhile, the lens single part and the assembly tolerance are good, and the manufacturability is good.
The unmanned aerial vehicle lens of the invention is specifically described below in four embodiments with reference to the accompanying drawings and tables. In the following embodiments, the present invention refers to a diaphragm as one side, a parallel flat plate located between the ninth lens L9 and the image plane as two sides, and the image plane as one side.
The parameters of the respective examples specifically satisfying the above conditional expression are shown in the following table 1:
| conditional expression | Example 1 | Example two | Example III | Example IV |
| 1.58≤Nd 3 ≤1.63 | 1.58 | 1.59 | 1.59 | 1.6 |
| 60≤Vd 3 ≤70 | 65 | 68.3 | 68.4 | 68.7 |
| 1.8≤Nd 5 ≤1.95 | 1.91 | 1.9 | 1.89 | 1.9 |
| 20≤Vd 5 ≤40 | 33.9 | 31.4 | 31.3 | 31.2 |
| -2.7≤F45/F≤-1.1 | -1.61 | -1.20 | -1.30 | -2.61 |
| 0.32≤F/TTL≤0.38 | 0.34 | 0.36 | 0.35 | 0.36 |
| 3.3≤TTL/Fg≤3.9 | 3.66 | 3.60 | 3.65 | 3.40 |
| 1.1≤F/Fg≤1.4 | 1.23 | 1.29 | 1.26 | 1.22 |
| -0.7≤F/Ft≤-0.4 | -0.52 | -0.65 | -0.56 | -0.57 |
Table 1 in an embodiment of the present invention, the aspherical lens of the unmanned aerial vehicle lens satisfies the following formula:
in the above formula, z is the axial distance from the curved surface to the vertex at the position with the height h perpendicular to the optical axis along the optical axis direction; c represents the curvature at the apex of the aspherical curved surface; k is a conic coefficient; a is that 4 、A 6 、A 8 、A 10 、A 12 、A 14 、A 16 The fourth order, sixth order, eighth order, tenth order, fourteenth order, sixteen order, respectively, are aspherical coefficients.
Example 1
Referring to fig. 1, the parameters of the lens of the unmanned aerial vehicle in this embodiment are as follows: focal length f=8.76 mm; focal length Fg of fixed group=7.1 mm, focal length Ft of focusing group= -16.89mm; total length ttl=26 mm.
Table 2 lists relevant parameters of each lens in the unmanned aerial vehicle lens of the present embodiment, including: surface type, radius of curvature, thickness, refractive index of the material, and abbe number.
TABLE 2
Table 3 shows the present exampleThe aspheric coefficients of each aspheric lens of the unmanned aerial vehicle lens comprise: the quadric constant K and the fourth-order aspheric coefficient A of the surface 4 Aspheric coefficient A of six orders 6 Eighth order aspheric coefficient A 8 Tenth order aspherical coefficient A 10 Twelve-order aspheric coefficient A 12 And fourteen-order aspheric coefficient a 14 。
| Face number | K | A 4 | A 6 | A 8 | A 10 | A 12 | A 14 |
| S3 | -0.45 | -5.87E-04 | 5.18E-05 | -2.24E-06 | 5.51E-08 | 1.53E-10 | -7.25E-17 |
| S4 | -0.23 | -4.76E-05 | 4.39E-05 | -2.57E-06 | 9.93E-08 | -1.01E-09 | 1.45E-15 |
| S13 | 15.88 | -9.79E-04 | 1.24E-04 | -4.45E-06 | 2.59E-08 | 2.20E-09 | -1.01E-15 |
| S14 | 1.52 | -1.11E-03 | 1.49E-04 | -4.12E-06 | -2.25E-08 | 3.07E-09 | 4.77E-16 |
| S17 | -1.18 | -5.68E-03 | 1.29E-04 | -7.74E-07 | -3.95E-08 | 2.37E-15 | -2.53E-17 |
| S18 | -3.78 | -3.73E-03 | 1.04E-04 | -1.69E-06 | 5.79E-09 | -2.15E-16 | 6.64E-18 |
TABLE 3 Table 3
As shown in fig. 1 and the above tables 1 to 3, the unmanned aerial vehicle lens of the embodiment realizes clear imaging with an object distance of infinity to 0.4m, has the characteristics of miniaturization, low production cost, low distortion and large target surface, can satisfy high resolution of more than two tens of millions of pixels, and has no virtual focus in a temperature range of-40 ℃ to +85 ℃. Meanwhile, the lens single part and the assembly tolerance are good, and the manufacturability is good.
Example two
Referring to fig. 2, the parameters of the lens of the unmanned aerial vehicle in this embodiment are as follows: focal length f=9.29 mm; focal length Fg of fixed group=7.21 mm, focal length Ft of focusing group= -14.16mm; total length ttl=26.01 mm.
Table 4 lists relevant parameters of each lens in the unmanned aerial vehicle lens of the present embodiment, including: surface type, radius of curvature, thickness, refractive index of the material, and abbe number.
TABLE 4 Table 4
Table 5 lists the aspherical coefficients of each aspherical lens of the unmanned aerial vehicle lens of the present embodiment, including: the quadric constant K and the fourth-order aspheric coefficient A of the surface 4 Aspheric coefficient A of six orders 6 Eighth order aspheric coefficient A 8 Tenth order aspherical coefficient A 10 Twelve-order aspheric coefficient A 12 And fourteen-order aspheric coefficient a 14 。
TABLE 5
As shown in fig. 2 and the above tables 1, 4 and 5, the unmanned aerial vehicle lens of the embodiment realizes clear imaging with an object distance of infinity to 0.4m, has the characteristics of miniaturization, low production cost, low distortion and large target surface, can satisfy high resolution of more than two tens of millions of pixels, and has no virtual focus in a temperature range of-40 ℃ to +85 ℃. Meanwhile, the lens single part and the assembly tolerance are good, and the manufacturability is good.
Example III
Referring to fig. 3, the parameters of the lens of the unmanned aerial vehicle of the present embodiment are as follows: focal length f=8.99 mm; focal length Fg of fixed group=7.12 mm, focal length Ft of focusing group= -15.88mm; total length ttl=26 mm.
Table 6 lists relevant parameters of each lens in the unmanned aerial vehicle lens of the present embodiment, including: surface type, radius of curvature, thickness, refractive index of the material, and abbe number.
TABLE 6
Table 7 lists the aspherical coefficients of each aspherical lens of the unmanned aerial vehicle lens of the present embodiment, including: quadric constant K, fourth order non-of the surfaceSpherical coefficient A 4 Aspheric coefficient A of six orders 6 Eighth order aspheric coefficient A 8 Tenth order aspherical coefficient A 10 Twelve-order aspheric coefficient A 12 And fourteen-order aspheric coefficient a 14 。
| Face number | K | A 4 | A 6 | A 8 | A 10 | A 12 | A 14 |
| S3 | -0.48 | -6.03E-04 | 5.08E-05 | -2.28E-06 | 4.98E-08 | 1.61E-10 | 3.03E-12 |
| S4 | -0.18 | -3.21E-05 | 4.39E-05 | -2.62E-06 | 9.60E-08 | -1.04E-09 | 4.51E-14 |
| S13 | 16.75 | -9.95E-04 | 1.23E-04 | -4.35E-06 | 3.56E-08 | 2.18E-09 | 5.16E-13 |
| S14 | 1.57 | -1.11E-03 | 1.49E-04 | -4.15E-06 | -2.24E-08 | 3.17E-09 | -2.08E-12 |
| S17 | -1.56 | -5.65E-03 | 1.29E-04 | -7.83E-07 | -3.96E-08 | 1.21E-11 | 5.04E-13 |
| S18 | -4.87 | -3.85E-03 | 1.01E-04 | -1.66E-06 | 4.99E-09 | -2.67E-12 | -8.02E-14 |
TABLE 7
As shown in fig. 3 and the above tables 1, 6 and 7, the unmanned aerial vehicle lens of the embodiment realizes clear imaging with an object distance of infinity to 0.4m, has the characteristics of miniaturization, low production cost, low distortion and large target surface, can satisfy high resolution of more than two tens of millions of pixels, and has no virtual focus in a temperature range of-40 ℃ to +85 ℃. Meanwhile, the lens single part and the assembly tolerance are good, and the manufacturability is good.
Example IV
Referring to fig. 4, the parameters of the unmanned aerial vehicle lens of the present embodiment are as follows: focal length f=9.10 mm; focal length Fg of fixed group=7.44 mm, focal length Ft of focusing group= -15.86mm; total length ttl=25.36 mm.
Table 8 lists relevant parameters of each lens in the unmanned aerial vehicle lens of the present embodiment, including: surface type, radius of curvature, thickness, refractive index of the material, and abbe number.
TABLE 8
Table 9 lists the aspherical coefficients of each aspherical lens of the unmanned aerial vehicle lens of the present embodiment, including: the quadric constant K and the fourth-order aspheric coefficient A of the surface 4 Aspheric coefficient A of six orders 6 Eighth order aspheric coefficient A 8 Tenth order aspherical coefficient A 10 Twelve-order aspheric coefficient A 12 And fourteen-order aspheric coefficient a 14 。
| Face number | K | A 4 | A 6 | A 8 | A 10 | A 12 | A 14 |
| S3 | -1.13 | -2.18E-04 | 1.25E-05 | -6.51E-10 | -1.04E-07 | 3.93E-09 | 0.00E+00 |
| S4 | -0.55 | 2.12E-04 | 1.13E-05 | -1.08E-06 | -1.31E-08 | 1.99E-09 | 0.00E+00 |
| S13 | -14.68 | -9.97E-04 | 6.72E-05 | -2.82E-06 | 1.26E-07 | -2.40E-09 | 0.00E+00 |
| S14 | -1.39 | -1.57E-03 | 1.32E-04 | -5.35E-06 | 1.85E-07 | -2.52E-09 | 0.00E+00 |
| S17 | -0.88 | -4.82E-03 | 1.12E-04 | -1.58E-06 | 0.00E+00 | 0.00E+00 | 0.00E+00 |
| S18 | -3.78 | -2.77E-03 | 5.63E-05 | -7.06E-07 | 0.00E+00 | 0.00E+00 | 0.00E+00 |
TABLE 9
As shown in fig. 4 and the above tables 1, 8 and 9, the unmanned aerial vehicle lens of the embodiment realizes clear imaging with an object distance of infinity to 0.4m, has the characteristics of miniaturization, low production cost, low distortion and large target surface, can satisfy high resolution of more than two tens of millions of pixels, and has no virtual focus in a temperature range of-40 ℃ to +85 ℃. Meanwhile, the lens single part and the assembly tolerance are good, and the manufacturability is good.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (10)
1. An unmanned aerial vehicle camera lens along the direction of optical axis from object side to image side includes in proper order: the focusing lens comprises a fixed group and a focusing group, wherein the fixed group is provided with positive focal power, when the object distance is changed, the focusing group moves along an optical axis to focus, and comprises a first lens (L1), a second lens (L2), a third lens (L3), a diaphragm, a fourth lens (L4), a fifth lens (L5), a sixth lens (L6) and a seventh lens (L7) which are sequentially arranged, and the focusing group is provided with negative focal power and comprises an eighth lens (L8) and a ninth lens (L9) which are sequentially arranged;
-the first lens (L1), the second lens (L2), the fifth lens (L5) and the eighth lens (L8) each have negative optical power;
-the third lens (L3), the fourth lens (L4), the sixth lens (L6) and the seventh lens (L7) each have positive optical power;
the ninth lens (L9) has positive or negative optical power;
the following conditional expression is satisfied between the focal length F of the unmanned aerial vehicle lens and the focal length Fg of the fixed group: F/Fg is more than or equal to 1.1 and less than or equal to 1.4;
the following conditional expression is satisfied between the focal length F of the unmanned aerial vehicle lens and the focal length Ft of the focusing group: F/Ft is less than or equal to-0.7 and less than or equal to-0.4.
2. The unmanned aerial vehicle lens of claim 1, wherein the lens is arranged in a direction from the object side to the image side along the optical axis,
the first lens (L1) and the ninth lens (L9) are both convex-concave lenses;
the second lens (L2) and the seventh lens (L7) are both meniscus lenses;
the third lens (L3), the fourth lens (L4) and the sixth lens (L6) are all convex-convex lenses;
the fifth lens (L5) is a concave lens;
the eighth lens (L8) is a concave-convex lens or a concave-convex lens.
3. The unmanned aerial vehicle lens according to claim 1, wherein the first lens (L1), the third lens (L3), the fourth lens (L4), the fifth lens (L5), the sixth lens (L6) and the eighth lens (L8) are spherical lenses;
the second lens (L2), the seventh lens (L7), and the ninth lens (L9) are all aspherical lenses.
4. The unmanned aerial vehicle lens according to claim 1, wherein the first lens (L1), the third lens (L3), the fourth lens (L4), the fifth lens (L5), the sixth lens (L6) and the eighth lens (L8) are all glass lenses;
the second lens (L2), the seventh lens (L7) and the ninth lens (L9) are all plastic lenses.
5. The unmanned aerial vehicle lens according to any of claims 1 to 4, wherein the fourth lens (L4) and the fifth lens (L5) are cemented together to form a doublet.
6. The unmanned aerial vehicle lens of claim 5, wherein the following conditional expression is satisfied between a focal length F45 of the doublet lens and a focal length F of the unmanned aerial vehicle lens: -2.7.ltoreq.F45/F.ltoreq.1.1.
7. The unmanned aerial vehicle lens according to any of claims 1 to 4, wherein the third lens (L3) has a refractive index Nd 3 And Abbe number Vd 3 The following conditional expressions are satisfied, respectively: nd is more than or equal to 1.58 3 ≤1.63；60≤Vd 3 ≤70。
8. The unmanned aerial vehicle lens according to any of claims 1 to 4, wherein the fifth lens (L5) has a refractive index Nd 5 And Abbe number Vd 5 The following conditional expressions are satisfied, respectively: nd is more than or equal to 1.8 5 ≤1.95；20≤Vd 5 ≤40。
9. The drone lens of any one of claims 1-4, wherein the following conditional expression is satisfied between a focal length F of the drone lens and a total length TTL of the drone lens: F/TTL is more than or equal to 0.32 and less than or equal to 0.38.
10. The drone lens of any one of claims 1-4, wherein the total length TTL of the drone lens and the focal length Fg of the stationary group satisfy the following conditional expression: TTL/Fg is less than or equal to 3.3 and less than or equal to 3.9.
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