CN113568146A - Unmanned aerial vehicle imaging lens - Google Patents
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- CN113568146A CN113568146A CN202110878440.7A CN202110878440A CN113568146A CN 113568146 A CN113568146 A CN 113568146A CN 202110878440 A CN202110878440 A CN 202110878440A CN 113568146 A CN113568146 A CN 113568146A
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- G—PHYSICS
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- 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
- 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
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
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Abstract
The invention discloses an unmanned aerial vehicle imaging lens, which sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens and a ninth lens from an object side to an image side along an optical axis, wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens and the ninth lens are negative refractive indexes, and the imaging lens only comprises the nine lenses. The imaging lens is short in total length, light in weight, small in temperature drift amount and good in color reduction degree, effectively avoids the blue-violet edge phenomenon, simultaneously weakens the energy of ghost images, and is high in imaging quality.
Description
Technical Field
The invention relates to the technical field of optics, in particular to an unmanned aerial vehicle imaging lens.
Background
In recent years, the industry of unmanned aerial vehicles is rapidly developed, and unmanned aerial vehicles are generally used in occasions such as aerial photography, spying, monitoring, communication, anti-diving, electronic interference and the like, so that unmanned aerial vehicles become important tools in industries such as civil use, military use and the like.
The existing unmanned aerial vehicle imaging lens has the following problems: ghost generally exists in the environment of a strong light source, and the imaging effect is influenced; blue-violet edge phenomenon can occur; the structure is long and the mass is large; the temperature drift amount of the lens is large, and when the temperature disturbance is too large, the imaging quality is influenced.
In view of this, the inventor of the present application invented an imaging lens for an unmanned aerial vehicle.
Disclosure of Invention
The invention aims to provide an unmanned aerial vehicle imaging lens which is short in total length, light in weight and high in imaging quality.
In order to achieve the purpose, the invention adopts the following technical scheme: an unmanned aerial vehicle imaging lens sequentially comprises a first lens, a second lens, a third lens and a fourth lens from an object side to an image side along an optical axis, wherein the first lens, the second lens and the third lens respectively comprise an object side surface facing the object side and allowing imaging light rays to pass through and an image side surface facing the image side and allowing imaging light rays to pass through;
the first lens element with negative refractive index has a convex object-side surface and a concave image-side surface;
the second lens element with negative refractive index has a convex object-side surface and a concave image-side surface;
the third lens element with negative refractive index has a convex object-side surface and a concave image-side surface;
the fourth lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the fifth lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the sixth lens element with negative refractive index has a concave object-side surface and a convex image-side surface;
the seventh lens element with positive refractive index has a convex object-side surface and a concave image-side surface;
the eighth lens element with a positive refractive index has a convex object-side surface and a convex image-side surface;
the ninth lens element with negative refractive index has a concave object-side surface and a convex image-side surface;
the imaging lens has only the nine lenses with the refractive index.
Further, the focal lengths of the first to ninth lenses satisfy:
-20<f1<-18， -32<f2<-31， -31<f3<-30， 8<f4<9，
10<f5<11， -17<f6<-15， 39<f7<41，10<f8<11， -8<f9<-7，
wherein f1, f2, f3, f4, f5, f6, f7, f8 and f9 are focal length values of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens and the ninth lens respectively.
Further, the absolute value of the ratio of the focal length of the first to ninth lenses to the focal length of the lens satisfies:
1.9<|(f1/f)|<2.1， 3.3<|(f2/f)|<3.4， 3.1<|(f3/f)|<3.3，
0.9<|(f4/f)|<1， 1<|(f5/f)|<1.1， 1.6<|(f6/f)|<1.7，
4.1<|(f7/f)|<4.3， 1.1<|(f8/f)|<1.2， 0.7<|(f9/f)|<0.8，
wherein f is the focal length of the lens, and f1, f2, f3, f4, f5, f6, f7, f8 and f9 are the focal length values of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens and the ninth lens, respectively.
Further, the image side surface of the third lens and the object side surface of the fourth lens are mutually glued, and the difference value of the dispersion coefficients of the third lens and the fourth lens is larger than 17.
Furthermore, the first lens, the third lens, the fourth lens, the sixth lens and the seventh lens are all glass spherical lenses, and the second lens 2, the fifth lens 5, the eighth lens 8 and the ninth lens 9 are all glass aspheric lenses.
Further, the seventh lens is made of a material with a negative temperature coefficient of refractive index, and the seventh lens is a positive lens.
Further, the R value of the object-side surface of the fifth lens is greater than 24, the R value of the image-side surface of the seventh lens is greater than 17, and the absolute value of the R value of the image-side surface of the ninth lens is greater than 18.
Further, the imaging lens satisfies: TTL =31mm, where TTL is the total optical length of the lens.
Further, the lens further comprises a diaphragm, and the diaphragm is located between the fourth lens and the fifth lens.
After the technical scheme is adopted, the invention has the following advantages:
1. the imaging lens is short in total length, light in weight, compact in structure and high in practicability;
2. the imaging lens adopts athermal design, has small temperature drift, and can well keep working states in various temperature environments;
3. the CRA of the imaging lens is 30 degrees, the CRA is matched with the sensor, the color reduction degree is good, and the illumination is uniform;
4. the imaging lens is designed by apochromatism, so that chromatic aberration is well optimized, and a blue-violet edge phenomenon is avoided;
5. the imaging lens well weakens the energy of ghost images by controlling the R value of the lens.
Drawings
Fig. 1 is a light path diagram of an imaging lens in embodiment 1 of the present invention;
FIG. 2 is a MTF graph of an imaging lens of embodiment 1 of the present invention;
FIG. 3 is a defocus graph of an imaging lens in embodiment 1 of the present invention;
FIG. 4 is a lateral chromatic aberration diagram of an imaging lens in embodiment 1 of the present invention;
FIG. 5 is a graph showing aberration characteristics of an imaging lens according to embodiment 1 of the present invention;
fig. 6 is a field curvature/distortion diagram of an imaging lens according to embodiment 1 of the present invention;
FIG. 7 is a diagram of an optical path of an imaging lens according to embodiment 2 of the present invention;
FIG. 8 is a MTF graph of an imaging lens of embodiment 2 of the present invention;
FIG. 9 is a defocus graph of an imaging lens in embodiment 2 of the present invention;
FIG. 10 is a lateral chromatic aberration diagram of an imaging lens of embodiment 2 of the present invention;
FIG. 11 is a graph showing aberration characteristics of an imaging lens according to embodiment 2 of the present invention;
fig. 12 is a field curvature/distortion diagram of an imaging lens according to embodiment 2 of the present invention;
FIG. 13 is a diagram of an optical path of an imaging lens according to embodiment 3 of the present invention;
FIG. 14 is a MTF graph of an imaging lens according to embodiment 3 of the present invention;
FIG. 15 is a defocus graph of an imaging lens in embodiment 3 of the present invention;
FIG. 16 is a lateral chromatic aberration diagram of an imaging lens of embodiment 3 of the present invention;
FIG. 17 is a graph showing aberration characteristics of an imaging lens according to embodiment 3 of the present invention;
fig. 18 is a field curvature/distortion diagram of an imaging lens according to embodiment 3 of the present invention;
FIG. 19 is a diagram showing the optical path of an imaging lens according to embodiment 4 of the present invention;
FIG. 20 is a MTF graph of an imaging lens according to embodiment 4 of the present invention;
FIG. 21 is a defocus graph of an imaging lens in embodiment 4 of the present invention;
FIG. 22 is a lateral chromatic aberration diagram of an imaging lens of embodiment 4 of the present invention;
FIG. 23 is a graph showing aberration characteristics of an imaging lens according to embodiment 4 of the present invention;
fig. 24 is a field curvature/distortion diagram of an imaging lens according to embodiment 4 of the present invention.
Description of reference numerals:
1-first lens, 2-second lens, 3-third lens, 4-fourth lens, 5-fifth lens, 6-sixth lens, 7-seventh lens, 8-eighth lens, 9-ninth lens, 10-diaphragm and 11-protective glass.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the present invention, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are all based on the orientation or positional relationship shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the apparatus or element of the present invention must have a specific orientation, and thus, should not be construed as limiting the present invention.
As used herein, the term "a lens element having a positive refractive index (or a negative refractive index)" means that the paraxial refractive index of the lens element calculated by Gaussian optics is positive (or negative). The term "object-side (or image-side) of a lens" is defined as the specific range of imaging light rays passing through the lens surface. The determination of the surface shape of the lens can be performed by the judgment method of a person skilled in the art, i.e., by the sign of the curvature radius (abbreviated as R value). The R value may be commonly used in optical design software, such as Zemax or CodeV. The R value is also commonly found in lens data sheets (lens data sheets) of optical design software. When the R value is positive, the object side is judged to be a convex surface; and when the R value is negative, judging that the object side surface is a concave surface. On the contrary, regarding the image side surface, when the R value is positive, the image side surface is judged to be a concave surface; when the R value is negative, the image side surface is judged to be convex.
The invention discloses an unmanned aerial vehicle imaging lens, which sequentially comprises a first lens 1 to a ninth lens 9 from an object side to an image side along an optical axis, wherein the first lens 1 to the ninth lens 9 respectively comprise an object side surface facing the object side and allowing imaging light rays to pass through and an image side surface facing the image side and allowing the imaging light rays to pass through;
the first lens element 1 has a negative refractive index, and the object-side surface and the image-side surface of the first lens element 1 are convex and concave;
the second lens element 2 has a negative refractive index, and the object-side surface and the image-side surface of the second lens element 2 are convex and concave;
the third lens element 3 has a negative refractive index, and the object-side surface and the image-side surface of the third lens element 3 are convex and concave;
the fourth lens element 4 has a positive refractive index, and the object-side surface and the image-side surface of the fourth lens element 4 are convex and convex, respectively;
the fifth lens element 5 has a positive refractive index, and the object-side surface and the image-side surface of the fifth lens element 5 are convex and convex;
the sixth lens element 6 has a negative refractive index, and the sixth lens element 6 has a concave object-side surface and a convex image-side surface;
the seventh lens element 7 has a positive refractive index, and the seventh lens element 7 has a convex object-side surface and a concave image-side surface;
the eighth lens element 8 has a positive refractive index, and an object-side surface and an image-side surface of the eighth lens element 8 are convex;
the ninth lens element 9 has a negative refractive index, and the ninth lens element 9 has a concave object-side surface and a convex image-side surface;
the imaging lens has only the nine lenses, and further includes a diaphragm 10, where the diaphragm 10 is located between the fourth lens element 4 and the fifth lens element 5.
Preferably, the focal lengths of the first to ninth lenses 1 to 9 satisfy:
-20<f1<-18， -32<f2<-31， -31<f3<-30， 8<f4<9，
10<f5<11， -17<f6<-15， 39<f7<41， 10<f8<11， -8<f9<-7，
wherein f1, f2, f3, f4, f5, f6, f7, f8 and f9 are focal length values of the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, the seventh lens 7, the eighth lens 8 and the ninth lens 9, respectively. The focal power is reasonably distributed, and the performance of the imaging lens is favorably improved.
Preferably, the absolute value of the ratio of the focal length of the first to ninth lenses 1 to 9 to the lens focal length satisfies:
1.9<|(f1/f)|<2.1， 3.3<|(f2/f)|<3.4， 3.1<|(f3/f)|<3.3，
0.9<|(f4/f)|<1， 1<|(f5/f)|<1.1， 1.6<|(f6/f)|<1.7，
4.1<|(f7/f)|<4.3， 1.1<|(f8/f)|<1.2， 0.7<|(f9/f)|<0.8，
where f is the focal length of the lens, and f1, f2, f3, f4, f5, f6, f7, f8, and f9 are the focal length values of the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, the seventh lens 7, the eighth lens 8, and the ninth lens 9, respectively. Therefore, the imaging lens optical system can be balanced, temperature drift is compensated, and imaging quality is guaranteed.
Preferably, the first lens 1, the third lens 3, the fourth lens 4, the sixth lens 6, and the seventh lens 7 are all glass spherical lenses, and the second lens 2, the fifth lens 5, the eighth lens 8, and the ninth lens 9 are all glass aspherical lenses. The image side surface of the third lens 3 and the object side surface of the fourth lens 4 are mutually glued, and the difference value of the dispersion coefficients of the third lens 3 and the fourth lens 4 is larger than 17. The apochromatic design ensures that the chromatic aberration is less than 2.5um, and the chromatic aberration is well corrected, and avoids the blue-violet phenomenon which is easy to appear in lens imaging.
Preferably, the seventh lens 7 is made of a material having a negative temperature coefficient of refractive index, and the seventh lens 7 is a positive lens. When the external temperature changes, the material can well offset the influence of the temperature change on the back focus of the lens, so that the lens can keep temperature drift compensation with the Holder, the clear and non-defocusing picture can be ensured when the lens is used in a temperature range of-20 ℃ to 70 ℃, and the requirements of most use environments can be met.
Preferably, the R value of the object-side surface of the fifth lens 5 is greater than 24, the R value of the image-side surface of the seventh lens 7 is greater than 17, and the absolute value of the R value of the image-side surface of the ninth lens 9 is greater than 18. Therefore, the energy of the ghost can be well dispersed, and the lens has higher imaging quality under strong light.
The imaging lens has TTL =31mm, wherein TTL is the total optical length of the lens. The lens has the advantages of light weight, compact structure and strong practicability, and the weight of the lens is less than 24 g.
CRA =30 ° of the imaging lens, where CRA is the chief ray angle of the lens. It is matched with sensor, and its colour reduction degree is good and illumination intensity is uniform.
F/NO =2.35 or 2.43 of the imaging lens, wherein F/NO is an aperture value of the lens. The light transmission is large, the image edge illumination is uniform, and the imaging quality is high.
The imaging surface of the imaging lens is 1/1' inches, and the imaging surface is more than ∅ 15.8.8 m. The imaging surface is large, and the imaging effect is good.
The integral F-tan (theta) distortion of the imaging lens is less than-1.7%, the deformation quantity corresponding to an image and an object is small, and the image is clear and does not deform.
The MTF of the imaging lens is more than 0.2 at 200mm/lp, the resolution can reach the level of twenty million pixels, the imaging quality is guaranteed, the overall static resolution and video resolution of the scheme are greatly improved, and the development of later-stage image optimization algorithms is greatly facilitated.
The mini infrared imaging lens of the present invention will be described in detail with specific embodiments.
Example 1
As shown in fig. 1, an imaging lens of an unmanned aerial vehicle sequentially includes, from an object side to an image side along an optical axis, first to ninth lenses 1 to 9, where each of the first to ninth lenses 1 to 9 includes an object side surface facing the object side and allowing an imaging light to pass therethrough and an image side surface facing the image side and allowing the imaging light to pass therethrough;
the first lens element 1 has a negative refractive index, and the object-side surface and the image-side surface of the first lens element 1 are convex and concave;
the second lens element 2 has a negative refractive index, and the object-side surface and the image-side surface of the second lens element 2 are convex and concave;
the third lens element 3 has a negative refractive index, and the object-side surface and the image-side surface of the third lens element 3 are convex and concave;
the fourth lens element 4 has a positive refractive index, and the object-side surface and the image-side surface of the fourth lens element 4 are convex and convex, respectively;
the fifth lens element 5 has a positive refractive index, and the object-side surface and the image-side surface of the fifth lens element 5 are convex and convex;
the sixth lens element 6 has a negative refractive index, and the sixth lens element 6 has a concave object-side surface and a convex image-side surface;
the seventh lens element 7 has a positive refractive index, and the seventh lens element 7 has a convex object-side surface and a concave image-side surface;
the eighth lens element 8 has a positive refractive index, and an object-side surface and an image-side surface of the eighth lens element 8 are convex;
the ninth lens element 9 has a negative refractive index, and the ninth lens element 9 has a concave object-side surface and a convex image-side surface;
the imaging lens has only the nine lenses, and further includes a diaphragm 10, where the diaphragm 10 is located between the fourth lens element 4 and the fifth lens element 5.
In this embodiment, the image-side surface of the third lens element 3 and the object-side surface of the fourth lens element 4 are cemented with each other to form a cemented lens.
Detailed optical data of this example are shown in table 1.
Table 1 detailed optical data for example 1
In this embodiment, the focal length F =9.61, the aperture value F/No. =2.35, and the total optical length TTL =31 mm.
In this embodiment, the second lens 2, the fifth lens 5, the eighth lens 8, and the ninth lens 9 are all glass aspheric lenses. The equation for the surface curve of an aspherical lens is expressed as follows:
wherein,
z: depth of the aspheric surface (the vertical distance between a point on the aspheric surface that is y from the optical axis and a tangent plane tangent to the vertex on the optical axis of the aspheric surface);
c: the curvature of the aspheric vertex (the vertex curvature);
k: cone coefficient (Conic Constant);
rn: normalized radius (normalysis radius (NRADIUS));
u：r/rn；
am: mth order QconCoefficient (is the m)thQcon coefficient)；
Qm con: mth order QconPolynomial (the m)thQcon polynomial)。
In the present embodiment, aspheric data of the second lens 2, the fifth lens 5, the eighth lens 8, and the ninth lens 9 are shown in table 2.
Table 2 aspheric data of example 1
In this embodiment, please refer to fig. 1 for a light path diagram of an imaging lens. Please refer to fig. 2, which shows that the MTF curve under the light of 434nm to 656nm is still greater than 0.2 in the full-field transfer function image when the spatial frequency of the lens reaches 200lp/mm, and the resolution and the imaging quality are high. Please refer to fig. 3, which shows the defocus curve of the imaging lens under light of 434nm-656nm, the defocus amount of the imaging lens under light is small. Referring to fig. 4, it can be seen that the lens improves the image color reducibility of the image through apochromatic design, and has small color difference and unobvious blue-violet phenomenon. Please refer to fig. 5, which shows the aberration characteristic curve under the light of 434nm to 656nm, the aberration value of the imaging lens for visible light is controlled within the range of 0.02mm to 0.05 mm. Referring to fig. 6, it can be seen that the optical distortion is controlled within-1.7%, the distortion quantity of the image-object correspondence is small, the image is clear and has no deformation, the imaging quality is high, the distortion is not required to be corrected by a later image algorithm, and the application is convenient.
Example 2
As shown in fig. 7, the surface convexoconcave and the refractive index of each lens of this example are substantially the same as those of the lens of example 1, and the optical parameters such as the curvature radius of the surface of each lens and the lens thickness are different.
Detailed optical data of this example are shown in table 3.
Table 3 detailed optical data of example 2
In this embodiment, the focal length F =9.61, the aperture value F/No. =2.43, and the total optical length TTL =31 mm.
In the present embodiment, aspheric data of the second lens 2, the fifth lens 5, the eighth lens 8, and the ninth lens 9 are shown in table 4.
Table 4 aspheric data of example 2
In this embodiment, please refer to fig. 7 for a light path diagram of the imaging lens. Please refer to fig. 8, which shows that the MTF curve under the light of 434nm to 656nm is still greater than 0.2 in the full-field transfer function image when the spatial frequency of the lens reaches 200lp/mm, and the resolution and the imaging quality are high. Please refer to fig. 9, which shows the defocus curve of the imaging lens under light of 434nm to 656nm, the defocus amount of the imaging lens under light is small. Referring to fig. 10, it can be seen that the lens improves the image color reducibility of the image through apochromatic design, and has small color difference to the color and unobvious blue-violet phenomenon. Please refer to fig. 11, which shows the aberration characteristic curve under the light of 434nm to 656nm, the aberration value of the imaging lens for visible light is controlled in the range of-0.03 mm to 0.04 mm. Referring to fig. 12, it can be seen that the optical distortion is controlled within-1.7%, the distortion amount of the image-to-object is small, the image is clear and has no deformation, the imaging quality is high, the distortion is not required to be corrected by a later image algorithm, and the application is convenient.
Example 3
As shown in fig. 13, the surface convexoconcave and the refractive index of each lens of this example are substantially the same as those of the lens of example 1, and the optical parameters such as the curvature radius of the surface of each lens and the lens thickness are different.
Detailed optical data of this example are shown in table 5.
Table 5 detailed optical data of example 3
In this embodiment, the focal length F =9.61, the aperture value F/No. =2.35, and the total optical length TTL =31 mm.
In the present embodiment, aspheric data of the second lens 2, the fifth lens 5, the eighth lens 8, and the ninth lens 9 are shown in table 6.
Table 6 aspheric data of example 3
In this embodiment, please refer to fig. 13 for a light path diagram of the imaging lens. Referring to fig. 14, it can be seen that the MTF curve under the light rays of 434nm to 656nm is still greater than 0.2 in the full-field transfer function image and the resolution and the imaging quality are high when the spatial frequency of the lens reaches 200 lp/mm. Please refer to fig. 15, which shows the defocus curve of the imaging lens under light of 434nm-656nm, the defocus amount of the imaging lens under light is small. Please refer to fig. 16, which shows that the lens improves the image color reducibility of the image through apochromatic design, and has small color difference and unobvious blue-violet phenomenon. Please refer to fig. 17, which shows the aberration characteristic curve under the light of 434nm to 656nm, the aberration value of the imaging lens for visible light is controlled in the range of-0.02 mm to 0.05 mm. Referring to fig. 18, it can be seen that the optical distortion is controlled within-1.7%, the distortion quantity of the image-object correspondence is small, the image is clear and has no deformation, the imaging quality is high, the distortion is not required to be corrected by a later image algorithm, and the application is convenient.
Example 4
As shown in fig. 19, the surface convexoconcave and the refractive index of each lens of this example are substantially the same as those of the lens of example 1, and the optical parameters such as the curvature radius of the surface of each lens and the lens thickness are different.
The detailed optical data of this example are shown in table 7.
Table 7 detailed optical data of example 4
In this embodiment, the focal length F =9.6, the aperture value F/No. =2.35, and the total optical length TTL =31 mm.
In the present embodiment, aspheric data of the second lens 2, the fifth lens 5, the eighth lens 8, and the ninth lens 9 are shown in table 8.
Table 8 aspheric data of example 4
In this embodiment, please refer to fig. 19 for a light path diagram of the imaging lens. Please refer to fig. 20, which shows that the MTF curve under the light rays of 434nm to 656nm is still greater than 0.2 in the full-field transfer function image, and the resolution and the imaging quality are high when the spatial frequency of the lens reaches 200 lp/mm. Please refer to fig. 21, which shows the defocus curve of the imaging lens in the light ray of 434nm-656nm, and it can be seen that the defocus amount of the imaging lens in the light ray is small. Please refer to fig. 22 for a transverse chromatic aberration diagram of an imaging lens under visible light, and it can be seen from the diagram that the lens improves the imaging color reducibility of an image through apochromatic design, and has small chromatic aberration to color and unobvious blue-violet phenomenon. Please refer to fig. 23, which shows the aberration characteristic curve under the light of 434nm to 656nm, wherein the aberration generated by the imaging lens for visible light is controlled within the range of-0.02 mm to 0.04 mm. Referring to fig. 24, it can be seen that the optical distortion is controlled within-1.7%, the distortion quantity of the image-object correspondence is small, the image is clear and has no deformation, the imaging quality is high, the distortion is not required to be corrected by a later image algorithm, and the application is convenient.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. The utility model provides an unmanned aerial vehicle imaging lens which characterized in that: the imaging lens sequentially comprises a first lens, a second lens, a third lens and a fourth lens from the object side to the image side along an optical axis, wherein the first lens, the second lens and the third lens respectively comprise an object side surface facing the object side and allowing the imaging light to pass through and an image side surface facing the image side and allowing the imaging light to pass through;
the first lens element with negative refractive index has a convex object-side surface and a concave image-side surface;
the second lens element with negative refractive index has a convex object-side surface and a concave image-side surface;
the third lens element with negative refractive index has a convex object-side surface and a concave image-side surface;
the fourth lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the fifth lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the sixth lens element with negative refractive index has a concave object-side surface and a convex image-side surface;
the seventh lens element with positive refractive index has a convex object-side surface and a concave image-side surface;
the eighth lens element with a positive refractive index has a convex object-side surface and a convex image-side surface;
the ninth lens element with negative refractive index has a concave object-side surface and a convex image-side surface;
the imaging lens has only the nine lenses with the refractive index.
2. The unmanned aerial vehicle imaging lens of claim 1, characterized in that: the focal lengths of the first to ninth lenses satisfy:
-20<f1<-18，-32<f2<-31，-31<f3<-30，8<f4<9，
10<f5<11，-17<f6<-15，39<f7<41，10<f8<11，-8<f9<-7，
wherein f1, f2, f3, f4, f5, f6, f7, f8 and f9 are focal length values of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens and the ninth lens respectively.
3. An unmanned aerial vehicle imaging lens of claim 1 or 2, characterized in that: the absolute value of the ratio of the focal length of the first lens to the focal length of the ninth lens to the focal length of the lens satisfies the following condition:
1.9<|(f1/f)|<2.1，3.3<|(f2/f)|<3.4，3.1<|(f3/f)|<3.3，
0.9<|(f4/f)|<1，1<|(f5/f)|<1.1，1.6<|(f6/f)|<1.7，
4.1<|(f7/f)|<4.3，1.1<|(f8/f)|<1.2，0.7<|(f9/f)|<0.8，
wherein f is the focal length of the lens, and f1, f2, f3, f4, f5, f6, f7, f8 and f9 are the focal length values of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens and the ninth lens, respectively.
4. The unmanned aerial vehicle imaging lens of claim 1, characterized in that: the image side surface of the third lens and the object side surface of the fourth lens are mutually glued, and the difference value of the dispersion coefficients of the third lens and the fourth lens is larger than 17.
5. An unmanned aerial vehicle imaging lens of claim 1 or 4, characterized in that: the first lens, the third lens, the fourth lens, the sixth lens and the seventh lens are all glass spherical lenses, and the second lens 2, the fifth lens 5, the eighth lens 8 and the ninth lens 9 are all glass aspheric lenses.
6. The unmanned aerial vehicle imaging lens of claim 1, characterized in that: the seventh lens is made of a material with a negative temperature coefficient of refractive index, and the seventh lens is a positive lens.
7. The unmanned aerial vehicle imaging lens of claim 1, characterized in that: the R value of the object side surface of the fifth lens is larger than 24, the R value of the image side surface of the seventh lens is larger than 17, and the absolute value of the R value of the image side surface of the ninth lens is larger than 18.
8. The unmanned aerial vehicle imaging lens of claim 1, characterized in that: the imaging lens satisfies: TTL =31mm, where TTL is the total optical length of the lens.
9. The unmanned aerial vehicle imaging lens of claim 1, characterized in that: the diaphragm is located between the fourth lens and the fifth lens.
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| CN202110878440.7A CN113568146A (en) | 2021-08-02 | 2021-08-02 | Unmanned aerial vehicle imaging lens |
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| CN202110878440.7A CN113568146A (en) | 2021-08-02 | 2021-08-02 | Unmanned aerial vehicle imaging lens |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023160277A1 (en) * | 2022-02-23 | 2023-08-31 | 东莞市宇瞳光学科技股份有限公司 | Prime lens |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106932889A (en) * | 2017-04-28 | 2017-07-07 | 深圳市东正光学技术有限公司 | Wide-angle lens |
| US20200241243A1 (en) * | 2019-01-28 | 2020-07-30 | Kantatsu Co., Ltd. | Imaging lens |
| CN112327465A (en) * | 2020-11-25 | 2021-02-05 | 厦门力鼎光电股份有限公司 | Wide-angle optical imaging lens |
| CN215340515U (en) * | 2021-08-02 | 2021-12-28 | 厦门力鼎光电股份有限公司 | Unmanned aerial vehicle imaging lens |
-
2021
- 2021-08-02 CN CN202110878440.7A patent/CN113568146A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106932889A (en) * | 2017-04-28 | 2017-07-07 | 深圳市东正光学技术有限公司 | Wide-angle lens |
| US20200241243A1 (en) * | 2019-01-28 | 2020-07-30 | Kantatsu Co., Ltd. | Imaging lens |
| CN112327465A (en) * | 2020-11-25 | 2021-02-05 | 厦门力鼎光电股份有限公司 | Wide-angle optical imaging lens |
| CN215340515U (en) * | 2021-08-02 | 2021-12-28 | 厦门力鼎光电股份有限公司 | Unmanned aerial vehicle imaging lens |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023160277A1 (en) * | 2022-02-23 | 2023-08-31 | 东莞市宇瞳光学科技股份有限公司 | Prime lens |
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