CN111190267A - Wide-angle optical imaging lens - Google Patents
Wide-angle optical imaging lens Download PDFInfo
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- CN111190267A CN111190267A CN202010106144.0A CN202010106144A CN111190267A CN 111190267 A CN111190267 A CN 111190267A CN 202010106144 A CN202010106144 A CN 202010106144A CN 111190267 A CN111190267 A CN 111190267A
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- 238000012634 optical imaging Methods 0.000 title claims abstract description 48
- 230000003287 optical effect Effects 0.000 claims description 24
- 239000006185 dispersion Substances 0.000 claims description 11
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- 238000003384 imaging method Methods 0.000 abstract description 7
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- 239000000463 material Substances 0.000 description 5
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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
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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
- G02B13/0055—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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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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Abstract
The invention relates to the technical field of lenses. The invention discloses a wide-angle optical imaging lens, which comprises ten lenses, wherein a first lens and a second lens are convex-concave lenses with negative refractive indexes; the third lens is a concave lens with negative refractive index; the fourth lens element, the fifth lens element and the ninth lens element are convex lenses with positive refractive index; the sixth lens is a concave-convex lens with positive refractive index; the seventh lens element with positive refractive index has a convex image-side surface; the eighth lens element and the tenth lens element are meniscus lenses with negative refractive index; the third lens and the fourth lens are mutually cemented and/or the seventh lens and the eighth lens are mutually cemented and/or the ninth lens and the tenth lens are mutually cemented. The invention has wide angle; the resolution ratio is high, and the imaging quality is high; the chromatic aberration is low, and the color reducibility is high; less distortion.
Description
Technical Field
The invention belongs to the technical field of lenses, and particularly relates to a wide-angle optical imaging lens for aerial photography of an unmanned aerial vehicle.
Background
With the continuous progress of scientific technology and the continuous development of society, in recent years, optical imaging lenses are also rapidly developed, and the optical imaging lenses are widely applied to various fields such as smart phones, tablet computers, video conferences, vehicle-mounted monitoring, security monitoring, unmanned aerial vehicle aerial photography and the like, so that the requirements on the optical imaging lenses are higher and higher.
In the field of unmanned aerial vehicle aerial photography, a wide-angle optical imaging lens is generally used for shooting to obtain a larger visual field, but the existing wide-angle optical imaging lens applied to the field of unmanned aerial vehicle aerial photography has many defects, such as lower resolution and poor imaging quality, and cannot meet the requirement of a 4K high-pixel sensor; because the angle is large, the chromatic aberration is difficult to correct, and color cast and purple fringing are easy to occur; large distortion, large deformation, large difficulty of software correction and the like, so that improvement is needed to meet the increasing requirements of consumers.
Disclosure of Invention
The present invention is directed to a wide-angle optical imaging lens to solve the above problems.
In order to achieve the purpose, the invention adopts the technical scheme that: a wide-angle optical imaging lens sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens from an object side to an image side along an optical axis; the first lens element to the tenth lens element each include an object-side surface facing the object side and passing the image light and an image-side surface facing the image side and passing the image light;
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 concave 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 positive refractive index has a concave object-side surface and a convex image-side surface;
the seventh lens element with positive refractive power has a convex image-side surface;
the eighth lens element with negative refractive index has a concave object-side surface and a convex image-side surface;
the ninth lens element with positive refractive power has a convex object-side surface and a convex image-side surface;
the tenth lens element with negative refractive index has a concave object-side surface and a convex image-side surface;
the third lens and the fourth lens are mutually cemented and/or the seventh lens and the eighth lens are mutually cemented and/or the ninth lens and the tenth lens are mutually cemented;
the wide-angle optical imaging lens only comprises the ten lenses with the refractive indexes.
Further, the wide-angle optical imaging lens further satisfies the following conditions: nd1 is more than or equal to 1.9, and D12/R12 is more than or equal to 1.8, wherein nd1 is the refractive index of the first lens, D12 is the outer diameter of the image side surface of the first lens, and R12 is the curvature radius of the image side surface of the first lens.
Further, the relative partial dispersion dPgF1 of the first lens is > 0.025.
Further, the wide-angle optical imaging lens further satisfies the following conditions: r21 < 15mm, R22 < 5mm, wherein R21 and R22 are the radii of curvature of the object-side surface and the image-side surface of the second lens, respectively.
Further, the wide-angle optical imaging lens further satisfies the following conditions: 1 < - | f4/f3 | 1.5, wherein f3 and f4 are focal lengths of the third lens element and the fourth lens element, respectively.
Further, the wide-angle optical imaging lens further satisfies the following conditions: nd5 > 1.9, where nd5 is the refractive index of the fifth lens.
Further, the wide-angle optical imaging lens further satisfies the following conditions: vd7 is more than or equal to 60, vd8 is less than or equal to 30, and vd7-vd8 are more than 30, wherein vd7 and vd8 are the dispersion coefficients of the seventh lens and the eighth lens respectively.
Further, the wide-angle optical imaging lens further satisfies the following conditions: vd9 is more than or equal to 65, vd10 is less than or equal to 35, and vd9-vd10 are more than 30, wherein vd9 and vd10 are the dispersion coefficients of the ninth lens and the tenth lens respectively.
Further, the wide-angle optical imaging lens further satisfies the following conditions: vd2 > 50, vd3 > 50, vd4 > 50 and vd6 > 50, wherein vd2 is the abbe number of the second lens, vd3 is the abbe number of the third lens, vd4 is the abbe number of the fourth lens, and vd6 is the abbe number of the sixth lens.
Further, the wide-angle optical imaging lens further satisfies the following conditions: 0.9 < | f2/f5 | < 1.2, wherein f2 and f5 are focal lengths of the second lens element and the fifth lens element, respectively.
The invention has the beneficial technical effects that:
the invention adopts ten lenses, and has wide angle through the arrangement design of the refractive index and the surface type of each lens; the resolution is high and can reach 4K level, the transfer function can reach high frequency 300lp/mm, and the contrast and the image quality are high; low chromatic aberration and high color reducibility; less distortion.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural diagram according to a first embodiment of the present invention;
FIG. 2 is a graph of MTF of 0.435-0.656 μm according to the first embodiment of the present invention;
FIG. 3 is a schematic diagram of a chromatic aberration curve according to a first embodiment of the present invention;
FIG. 4 is a diagram illustrating curvature of field and distortion according to a first embodiment of the present invention;
FIG. 5 is a schematic structural diagram according to a second embodiment of the present invention;
FIG. 6 is a graph of MTF of 0.435-0.656 μm according to example two of the present invention;
FIG. 7 is a schematic diagram of a color difference curve according to a second embodiment of the present invention;
FIG. 8 is a diagram illustrating curvature of field and distortion according to a second embodiment of the present invention;
FIG. 9 is a schematic structural diagram of a third embodiment of the present invention;
FIG. 10 is a graph of MTF of 0.435-0.656 μm according to example three of the present invention;
FIG. 11 is a schematic diagram of a color difference curve according to a third embodiment of the present invention;
FIG. 12 is a diagram illustrating curvature of field and distortion according to a third embodiment of the present invention;
FIG. 13 is a schematic structural diagram according to a fourth embodiment of the present invention;
FIG. 14 is a graph of MTF of 0.435-0.656 μm for example four of the present invention;
FIG. 15 is a schematic diagram of a chromatic aberration curve according to a fourth embodiment of the present invention;
FIG. 16 is a graph showing curvature of field and distortion according to a fourth embodiment of the present invention;
FIG. 17 is a table of values of relevant important parameters according to four embodiments of the present invention.
Detailed Description
To further illustrate the various embodiments, the invention provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. Those skilled in the art will appreciate still other possible embodiments and advantages of the present invention with reference to these figures. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.
The invention will now be further described with reference to the accompanying drawings and detailed description.
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 provides a wide-angle optical imaging lens which sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens from an object side to an image side along an optical axis; the first lens element to the tenth lens element each include an object-side surface facing the object side and passing the image light, and an image-side surface facing the image side and passing the image light.
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 concave object-side surface and a concave image-side surface.
The fourth lens element with positive refractive power has a convex object-side surface and a convex image-side surface.
The fifth lens element with positive refractive power has a convex object-side surface and a convex image-side surface.
The sixth lens element with positive refractive power has a concave object-side surface and a convex image-side surface.
The seventh lens element with a positive refractive power has a convex image-side surface.
The eighth lens element with negative refractive index has a concave object-side surface and a convex image-side surface.
The ninth lens element with positive refractive power has a convex object-side surface and a convex image-side surface.
The tenth lens element with a negative refractive index has a concave object-side surface and a convex image-side surface.
The third lens and the fourth lens are mutually cemented and/or the seventh lens and the eighth lens are mutually cemented and/or the ninth lens and the tenth lens are mutually cemented; the wide-angle optical imaging lens only comprises the ten lenses with the refractive indexes.
The invention adopts ten lenses, and has wide angle through the arrangement design of the refractive index and the surface type of each lens; the resolution is high and can reach 4K level, the transfer function can reach high frequency 300lp/mm, and the contrast and the image quality are high; low chromatic aberration and high color reducibility; less distortion.
Preferably, the wide-angle optical imaging lens further satisfies the following conditions: nd1 is more than or equal to 1.9, and D12/R12 is more than or equal to 1.8, wherein nd1 is the refractive index of the first lens, D12 is the outer diameter of the image side surface of the first lens, and R12 is the curvature radius of the image side surface of the first lens, thereby further reducing the optical system distortion and controlling the outer diameter of the first lens.
Preferably, the relative partial dispersion dPgF1 of the first lens is > 0.025, better to achieve multi-wavelength achromatization.
Preferably, the wide-angle optical imaging lens further satisfies the following conditions: r21 is less than 15mm, R22 is less than 5mm, wherein R21 and R22 are curvature radii of an object side surface and an image side surface of the second lens respectively, and distortion of an optical system is further reduced.
Preferably, the wide-angle optical imaging lens further satisfies the following conditions: 1 < - | f4/f3 | < 1.5, wherein f3 and f4 are the focal lengths of the third lens and the fourth lens, respectively, thereby optimizing the resolution and reducing chromatic aberration.
Preferably, the wide-angle optical imaging lens further satisfies the following conditions: nd5 is more than 1.9, wherein nd5 is the refractive index of the fifth lens, and the resolution is further improved.
Preferably, the wide-angle optical imaging lens further satisfies the following conditions: vd7 is more than or equal to 60, vd8 is less than or equal to 30, and vd7-vd8 are more than 30, wherein vd7 and vd8 are dispersion coefficients of the seventh lens and the eighth lens respectively, and high-low dispersion combination is adopted, so that multi-wavelength wide-spectrum achromatization is better realized, and image quality is optimized.
Preferably, the wide-angle optical imaging lens further satisfies the following conditions: vd9 is more than or equal to 65, vd10 is less than or equal to 35, and vd9-vd10 is more than 30, wherein vd9 and vd10 are dispersion coefficients of the ninth lens and the tenth lens respectively, and the multi-wavelength wide-spectrum achromatization is better realized by combining high-low dispersion materials.
Preferably, the wide-angle optical imaging lens further satisfies the following conditions: vd2 > 50, vd3 > 50, vd4 > 50 and vd6 > 50, wherein vd2 is the abbe number of the second lens, vd3 is the abbe number of the third lens, vd4 is the abbe number of the fourth lens, and vd6 is the abbe number of the sixth lens, so that chromatic aberration is further optimized.
Preferably, the wide-angle optical imaging lens further satisfies the following conditions: 0.9 < | f2/f5 | < 1.2, wherein f2 and f5 are the focal lengths of the second lens element and the fifth lens element, respectively, and the surface type is controlled to optimize chromatic aberration.
Preferably, the optical diaphragm is arranged between the fifth lens and the sixth lens, and the front five structure and the rear five structure further reduce distortion and improve system performance.
The wide-angle optical imaging lens of the present invention will be described in detail below with specific embodiments.
Example one
As shown in fig. 1, a wide-angle optical imaging lens includes, in order along an optical axis I from an object side a1 to an image side a2, a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a stop 110, a sixth lens 6, a seventh lens 7, an eighth lens 8, a ninth lens 9, a tenth lens 100, a protective sheet 120, and an image plane 130; the first lens element 1 to the tenth lens element 100 each include an object-side surface facing the object side a1 and passing the image light, and an image-side surface facing the image side a2 and passing the image light.
The first lens element 1 has a negative refractive index, the object-side surface 11 of the first lens element 1 is convex, and the image-side surface 12 of the first lens element 1 is concave.
The second lens element 2 has a negative refractive index, and an object-side surface 21 of the second lens element 2 is convex and an image-side surface 22 of the second lens element 2 is concave.
The third lens element 3 has a negative refractive index, and an object-side surface 31 of the third lens element 3 is concave and an image-side surface 32 of the third lens element 3 is concave.
The fourth lens element 4 has a positive refractive index, the object-side surface 41 of the fourth lens element 4 is convex, and the image-side surface 42 of the fourth lens element 4 is convex.
The fifth lens element 5 has a positive refractive index, the object-side surface of the fifth lens element 51 is convex, and the image-side surface 52 of the fifth lens element 5 is convex.
The sixth lens element 6 with positive refractive power has a concave object-side surface 61 of the sixth lens element 6 and a convex image-side surface 62 of the sixth lens element 6.
The seventh lens element 7 has positive refractive index, the object-side surface 71 of the seventh lens element 7 is a convex surface, although in some embodiments, the object-side surface 71 of the seventh lens element 7 can also be a flat surface or a concave surface, and the image-side surface 72 of the seventh lens element 7 is a convex surface.
The eighth lens element 8 has a negative refractive index, and an object-side surface 81 of the eighth lens element 8 is concave and an image-side surface 82 of the eighth lens element 8 is convex.
The ninth lens element 9 with positive refractive power has a convex object-side surface 91 of the ninth lens element 9 and a convex image-side surface 92 of the ninth lens element 9.
The tenth lens element 100 with negative refractive index has a concave object-side surface 101 of the tenth lens element 100 and a convex image-side surface 102 of the tenth lens element 100.
In this embodiment, the third lens 3 and the fourth lens 4 are cemented with each other, the seventh lens 7 and the eighth lens 8 are cemented with each other, the ninth lens 9 and the tenth lens 100 are cemented with each other, and three groups of lenses are used for achieving lower chromatic aberration, however, in some embodiments where the chromatic aberration is not too low, only any one group of lenses may be cemented, such as the third lens 3 and the fourth lens 4 are cemented with each other; or any two groups of lenses are cemented, such as the seventh lens 7 and the eighth lens 8, the ninth lens 9 and the tenth lens 100, and the third lens 3 and the fourth lens 4 are not cemented.
In this embodiment, the first lens element 1 to the tenth lens element 100 are made of glass material, but not limited thereto, and in other embodiments, they may be made of plastic material.
Of course, in some embodiments, the stop 110 may also be disposed between other lenses.
The detailed optical data of this embodiment are shown in Table 1-1.
Table 1-1 detailed optical data for example one
Please refer to fig. 17 for the values of the conditional expressions related to the present embodiment.
Referring to fig. 2, it can be seen that the transfer function can reach a high frequency of 300lp/mm, the resolution is as high as 4K, and the contrast is high; referring to fig. 3, it can be seen that the chromatic aberration is small, the chromatic aberration is less than 3 μm under 435 nm-656 nm of visible light wide spectrum, and the color reducibility is high; as shown in FIGS. 4 (A) and (B), the field curvature and distortion pattern was as small as-1.1%.
In this embodiment, the focal length f of the wide-angle optical imaging lens is 2.7mm, the aperture value FNO is 2.6, the image height IMH is 8mm, the distance TTL between the object-side surface 11 of the first lens 1 and the imaging surface 130 on the optical axis I is 23.94mm, and the field angle FOV is 170 °.
Example two
As shown in fig. 5, in this embodiment, the surface convexoconcave and the refractive index of each lens are the same as those of the first embodiment, and only the optical parameters such as the curvature radius of the surface of each lens and the thickness of the lens are different.
The detailed optical data of this embodiment is shown in Table 2-1.
TABLE 2-1 detailed optical data for example two
Please refer to fig. 17 for the values of the conditional expressions related to the present embodiment.
Referring to fig. 6, it can be seen that the transfer function can reach a high frequency of 300lp/mm, the resolution is as high as 4K, and the contrast is high; referring to fig. 7, it can be seen that the chromatic aberration is small, the chromatic aberration is less than 3 μm under 435 nm-656 nm of visible light wide spectrum, and the color reducibility is high; as shown in FIGS. 8 (A) and (B), the field curvature and distortion pattern was as small as-2.2%.
In this embodiment, the focal length f of the wide-angle optical imaging lens is 2.7mm, the aperture value FNO is 2.6, the image height IMH is 8mm, the distance TTL between the object-side surface 11 of the first lens 1 and the imaging surface 130 on the optical axis I is 24.00mm, and the field angle FOV is 168 °.
EXAMPLE III
As shown in fig. 9, in this embodiment, the surface convexoconcave and the refractive index of each lens are the same as those of the first embodiment, and only the optical parameters such as the curvature radius of the surface of each lens and the thickness of the lens are different.
The detailed optical data of this embodiment is shown in Table 3-1.
TABLE 3-1 detailed optical data for EXAMPLE III
| Surface of | Radius of curvature/mm | Thickness/mm | Material of | Refractive index | Abbe number | Focal length/mm | ||
| - | Shot object | Infinity | Infinity | |||||
| 11 | First lens | 10.966 | 1.19 | H-ZF88 | 1.95 | 17.94 | -8.59 | |
| 12 | 4.451 | 2.11 | ||||||
| 21 | Second lens | 14.273 | 0.55 | Glass | 1.73 | 54.67 | -5.69 | |
| 22 | 3.172 | 2.27 | ||||||
| 31 | Third lens | -7.729 | 0.46 | Glass | 1.50 | 81.61 | -5.06 | |
| 32 | 3.819 | 0 | ||||||
| 41 | Fourth lens | 3.819 | 1.71 | Glass | 1.52 | 58.95 | 5.73 | |
| 42 | -11.540 | 0.05 | ||||||
| 51 | Fifth lens element | 6.261 | 2.00 | Glass | 2.00 | 25.44 | 5.68 | |
| 52 | -57.478 | 0.71 | ||||||
| 110 | Diaphragm | Infinity | 0.26 | |||||
| 61 | Sixth lens element | -6.652 | 1.69 | Glass | 1.73 | 51.49 | 27.75 | |
| 62 | -5.562 | 0.10 | ||||||
| 71 | Seventh lens element | 40.244 | 1.93 | Glass | 1.59 | 68.65 | 4.28 | |
| 72 | -2.671 | 0 | ||||||
| 81 | Eighth lens element | -2.671 | 0.81 | Glass | 2.00 | 19.32 | -4.55 | |
| 82 | -7.299 | 0.88 | ||||||
| 91 | Ninth lens | 10.077 | 2.67 | Glass | 1.57 | 71.28 | 5.80 | |
| 92 | -4.456 | 0 | ||||||
| 101 | Tenth lens | -4.456 | 0.55 | Glass | 1.65 | 33.84 | -10.23 | |
| 102 | -14.082 | 0.60 | ||||||
| 120 | Protective sheet | Infinity | 0.80 | Glass | 1.52 | 64.21 | ||
| - | Infinity | 2.75 | ||||||
| 130 | Image plane | Infinity |
Please refer to fig. 17 for the values of the conditional expressions related to the present embodiment.
Referring to fig. 10, it can be seen that the transfer function has a high frequency of 300lp/mm, a high resolution of 4K, and a high contrast ratio; referring to fig. 11, it can be seen that the chromatic aberration is small, the chromatic aberration is less than 3 μm under 435 nm-656 nm of visible light wide spectrum, and the color reducibility is high; as shown in FIGS. 12 (A) and (B), the field curvature and distortion pattern was as small as-1.8%.
In this embodiment, the focal length f of the wide-angle optical imaging lens is 2.7mm, the aperture value FNO is 2.6, the image height IMH is 8mm, the distance TTL between the object-side surface 11 of the first lens 1 and the imaging surface 130 on the optical axis I is 24.09mm, and the field angle FOV is 168 °.
Example four
As shown in fig. 13, the surface-type convexo-concave and refractive index of each lens element of this embodiment are substantially the same as those of the first embodiment, only the object-side surface 71 of the seventh lens element 7 is a concave surface, and the optical parameters such as the curvature radius of the surface of each lens element and the thickness of the lens element are different.
The detailed optical data of this embodiment is shown in Table 4-1.
TABLE 4-1 detailed optical data for example four
| Surface of | Radius of curvature/mm | Thickness/mm | Material of | Refractive index | Abbe number | Focal length/mm | ||
| - | Shot object | Infinity | Infinity | |||||
| 11 | First lens | 12.891 | 1.48 | SF59 | 1.95 | 20.9 | -8.79 | |
| 12 | 4.822 | 1.94 | ||||||
| 21 | Second lens | 10.195 | 0.90 | Glass | 1.73 | 54.67 | -7.41 | |
| 22 | 3.410 | 2.29 | ||||||
| 31 | Third lens | -7.681 | 1.82 | Glass | 1.50 | 81.59 | -6.27 | |
| 32 | 5.679 | 0 | ||||||
| 41 | Fourth lens | 5.679 | 1.65 | Glass | 1.52 | 64.21 | 7.38 | |
| 42 | -10.566 | 0.05 | ||||||
| 51 | Fifth lens element | 6.791 | 1.63 | Glass | 2.00 | 25.44 | 6.32 | |
| 52 | -94.259 | 0.94 | ||||||
| 110 | Diaphragm | Infinity | 0.34 | |||||
| 61 | Sixth lens element | -5.967 | 1.73 | Glass | 1.75 | 52.34 | 22.16 | |
| 62 | -4.954 | 0.33 | ||||||
| 71 | Seventh lens element | -108.012 | 1.07 | Glass | 1.59 | 68.62 | 4.72 | |
| 72 | -2.749 | 0 | ||||||
| 81 | Eighth lens element | -2.749 | 0.78 | Glass | 2.00 | 19.32 | -4.88 | |
| 82 | -7.062 | 0.72 | ||||||
| 91 | Ninth lens | 7.685 | 2.80 | Glass | 1.59 | 68.62 | 4.78 | |
| 92 | -3.901 | 0 | ||||||
| 101 | Tenth lens | -3.901 | 0.46 | Glass | 1.65 | 33.84 | -7.07 | |
| 102 | -26.459 | 0.19 | ||||||
| 120 | Protective sheet | Infinity | 0.80 | Glass | 1.52 | 64.21 | ||
| - | Infinity | 2.55 | ||||||
| 130 | Image plane | Infinity |
Please refer to fig. 17 for the values of the conditional expressions related to the present embodiment.
Referring to fig. 14, it can be seen that the transfer function has a high frequency of 300lp/mm, a high resolution of 4K, and a high contrast ratio; referring to fig. 15, it can be seen that the chromatic aberration is small, the chromatic aberration is less than 3 μm under 435 nm-656 nm of visible light wide spectrum, and the color reducibility is high; as shown in FIGS. 16 (A) and (B), the field curvature and distortion pattern was as small as-0.5%.
In this embodiment, the focal length f of the wide-angle optical imaging lens is 2.7mm, the aperture value FNO is 2.6, the image height IMH is 7.5mm, the distance TTL between the object-side surface 11 of the first lens 1 and the imaging surface 130 on the optical axis I is 24.47mm, and the field angle FOV is 168 °.
The wide-angle optical imaging lens is suitable for the field of aerial photography of unmanned aerial vehicles.
While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A wide-angle optical imaging lens, characterized in that: the lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens in sequence from the object side to the image side along an optical axis; the first lens element to the tenth lens element each include an object-side surface facing the object side and passing the image light and an image-side surface facing the image side and passing the image light;
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 concave 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 positive refractive index has a concave object-side surface and a convex image-side surface;
the seventh lens element with positive refractive power has a convex image-side surface;
the eighth lens element with negative refractive index has a concave object-side surface and a convex image-side surface;
the ninth lens element with positive refractive power has a convex object-side surface and a convex image-side surface;
the tenth lens element with negative refractive index has a concave object-side surface and a convex image-side surface;
the third lens and the fourth lens are mutually cemented and/or the seventh lens and the eighth lens are mutually cemented and/or the ninth lens and the tenth lens are mutually cemented;
the wide-angle optical imaging lens only comprises the ten lenses with the refractive indexes.
2. The wide-angle optical imaging lens of claim 1, further satisfying: nd1 is more than or equal to 1.9, and D12/R12 is more than or equal to 1.8, wherein nd1 is the refractive index of the first lens, D12 is the outer diameter of the image side surface of the first lens, and R12 is the curvature radius of the image side surface of the first lens.
3. The wide-angle optical imaging lens of claim 1, wherein: the relative partial dispersion dPgF1 of the first lens is > 0.025.
4. The wide-angle optical imaging lens of claim 1, further satisfying: r21 < 15mm, R22 < 5mm, wherein R21 and R22 are the radii of curvature of the object-side surface and the image-side surface of the second lens, respectively.
5. The wide-angle optical imaging lens of claim 1, further satisfying: 1 < - | f4/f3 | 1.5, wherein f3 and f4 are focal lengths of the third lens element and the fourth lens element, respectively.
6. The wide-angle optical imaging lens of claim 1, further satisfying: nd5 > 1.9, where nd5 is the refractive index of the fifth lens.
7. The wide-angle optical imaging lens of claim 1, further satisfying: vd7 is more than or equal to 60, vd8 is less than or equal to 30, and vd7-vd8 are more than 30, wherein vd7 and vd8 are the dispersion coefficients of the seventh lens and the eighth lens respectively.
8. The wide-angle optical imaging lens of claim 1, further satisfying: vd9 is more than or equal to 65, vd10 is less than or equal to 35, and vd9-vd10 are more than 30, wherein vd9 and vd10 are the dispersion coefficients of the ninth lens and the tenth lens respectively.
9. The wide-angle optical imaging lens of claim 1, further satisfying: vd2 > 50, vd3 > 50, vd4 > 50 and vd6 > 50, wherein vd2 is the abbe number of the second lens, vd3 is the abbe number of the third lens, vd4 is the abbe number of the fourth lens, and vd6 is the abbe number of the sixth lens.
10. The wide-angle optical imaging lens of claim 1, further satisfying: 0.9 < | f2/f5 | < 1.2, wherein f2 and f5 are focal lengths of the second lens element and the fifth lens element, respectively.
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Cited By (2)
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| CN114460725A (en) * | 2022-01-17 | 2022-05-10 | 北京理工大学 | Empty dual-purpose panoramic lens of water |
| TWI770777B (en) * | 2021-01-20 | 2022-07-11 | 大陸商信泰光學（深圳）有限公司 | Lens assembly |
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| US20160147042A1 (en) * | 2014-11-25 | 2016-05-26 | Fujifilm Corporation | Imaging lens and imaging apparatus |
| US20160282588A1 (en) * | 2013-10-21 | 2016-09-29 | Kantatsu Co., Ltd. | Image pickup lens |
| US20180059362A1 (en) * | 2016-08-29 | 2018-03-01 | Sintai Optical (Shenzhen) Co., Ltd. | Lens assembly |
| CN211293431U (en) * | 2020-02-21 | 2020-08-18 | 厦门力鼎光电股份有限公司 | Wide-angle optical imaging lens |
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| US20160282588A1 (en) * | 2013-10-21 | 2016-09-29 | Kantatsu Co., Ltd. | Image pickup lens |
| US20160147042A1 (en) * | 2014-11-25 | 2016-05-26 | Fujifilm Corporation | Imaging lens and imaging apparatus |
| US20180059362A1 (en) * | 2016-08-29 | 2018-03-01 | Sintai Optical (Shenzhen) Co., Ltd. | Lens assembly |
| CN107783252A (en) * | 2016-08-29 | 2018-03-09 | 信泰光学(深圳)有限公司 | Imaging lens |
| CN211293431U (en) * | 2020-02-21 | 2020-08-18 | 厦门力鼎光电股份有限公司 | Wide-angle optical imaging lens |
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| TWI770777B (en) * | 2021-01-20 | 2022-07-11 | 大陸商信泰光學（深圳）有限公司 | Lens assembly |
| CN114460725A (en) * | 2022-01-17 | 2022-05-10 | 北京理工大学 | Empty dual-purpose panoramic lens of water |
| CN114460725B (en) * | 2022-01-17 | 2022-12-02 | 北京理工大学 | Empty dual-purpose panoramic lens of water |
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| CN111190267B (en) | 2024-07-19 |
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