CN111190267B - Wide-angle optical imaging lens - Google Patents
Wide-angle optical imaging lens Download PDFInfo
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- CN111190267B CN111190267B CN202010106144.0A CN202010106144A CN111190267B CN 111190267 B CN111190267 B CN 111190267B CN 202010106144 A CN202010106144 A CN 202010106144A CN 111190267 B CN111190267 B CN 111190267B
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- 238000012634 optical imaging Methods 0.000 title claims abstract description 42
- 238000003384 imaging method Methods 0.000 claims abstract description 18
- 230000003287 optical effect Effects 0.000 claims description 26
- 239000006185 dispersion Substances 0.000 claims description 16
- 239000011521 glass Substances 0.000 description 21
- 238000010586 diagram Methods 0.000 description 11
- 239000000463 material Substances 0.000 description 7
- 230000004075 alteration Effects 0.000 description 6
- 238000001228 spectrum Methods 0.000 description 6
- 238000012546 transfer Methods 0.000 description 6
- 230000014509 gene expression Effects 0.000 description 4
- 230000001681 protective effect Effects 0.000 description 3
- 230000003746 surface roughness Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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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 the first lens and the second lens are convex-concave lenses with negative refractive index; the third lens is a concave lens with negative refractive index; the fourth lens, the fifth lens and the ninth lens are convex-convex lenses with positive refractive index; the sixth lens is a concave-convex lens with positive refractive index; the seventh lens has positive refractive index, and the image side surface is a convex surface; the eighth lens and the tenth lens are concave-convex lenses with negative refractive index; the third lens and the fourth lens are glued to each other and/or the seventh lens and the eighth lens are glued to each other and/or the ninth lens and the tenth lens are glued to each other. The invention has wide angle; the resolution is high, and the imaging quality is high; the color difference 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 unmanned aerial vehicle aerial photography.
Background
With the continuous progress of science and technology and the continuous development of society, in recent years, an optical imaging lens is rapidly developed, and the optical imaging lens is widely applied to various fields of smart phones, tablet personal computers, video conferences, vehicle-mounted monitoring, security monitoring, unmanned aerial vehicle aerial photography and the like, so that the requirements on the optical imaging lens are also higher and higher.
In the unmanned aerial vehicle aerial photographing field, a wide-angle optical imaging lens is generally used for photographing to obtain a larger visual field, but the existing wide-angle optical imaging lens applied to the unmanned aerial vehicle aerial photographing field has many defects, such as lower resolution and poor imaging quality, and does not meet the requirement of a sensor with 4K high pixels; because the angle is large, chromatic aberration is difficult to correct, and color cast and purple fringing are easy to occur; large distortion, large deformation, large software correction difficulty, and the like, and therefore, improvement thereof is necessary to meet the increasing demands of consumers.
Disclosure of Invention
The present invention is directed to a wide-angle optical imaging lens for solving the above-mentioned technical problems.
In order to achieve the above purpose, the invention adopts the following technical scheme: the wide-angle optical 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; the first lens element to the tenth lens element each comprise an object side surface facing the object side and allowing the 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 has negative refractive index, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface;
The second lens has negative refractive index, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface;
the third lens has negative refractive index, the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a concave surface;
the fourth lens has positive refractive index, the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface;
The fifth lens has positive refractive index, the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface;
the sixth lens element has positive refractive index, wherein the object-side surface of the sixth lens element is concave, and the image-side surface of the sixth lens element is convex;
the seventh lens has positive refractive index, and the image side surface of the seventh lens is a convex surface;
the eighth lens has negative refractive power, the object side surface of the eighth lens is a concave surface, and the image side surface of the eighth lens is a convex surface;
the ninth lens has positive refractive index, the object side surface of the ninth lens is a convex surface, and the image side surface of the ninth lens is a convex surface;
the tenth lens has negative refractive power, the object side surface of the tenth lens is a concave surface, and the image side surface of the tenth lens is a convex surface;
the third lens and the fourth lens are mutually glued and/or the seventh lens and the eighth lens are mutually glued and/or the ninth lens and the tenth lens are mutually glued;
The wide-angle optical imaging lens has only ten lenses with refractive index.
Further, the wide-angle optical imaging lens further satisfies: nd1 is equal to or greater than 1.9, and D12/R12 is equal to or greater than 1.8, wherein nd1 is the refractive index of the first lens, D12 is the outer diameter of the image side of the first lens, and R12 is the radius of curvature of the image side of the first lens.
Further, the relative partial dispersion dPgF of the first lens is > 0.025.
Further, the wide-angle optical imaging lens further satisfies: r21 < 15mm, R22 < 5mm, wherein R21 and R22 are the radii of curvature of the object-side and image-side surfaces, respectively, of the second lens.
Further, the wide-angle optical imaging lens further satisfies: 1 < |f4/f3| < 1.5, wherein f3 and f4 are the focal lengths of the third lens and the fourth lens, respectively.
Further, the wide-angle optical imaging lens further satisfies: nd5 > 1.9, wherein nd5 is the refractive index of the fifth lens.
Further, the wide-angle optical imaging lens further satisfies: vd7 is more than or equal to 60, vd8 is less than or equal to 30, and vd7-vd8 is 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: vd9 is greater than or equal to 65, vd10 is greater than or equal to 35, and vd9-vd10 is greater than 30, wherein vd9 and vd10 are the dispersion coefficients of the ninth and tenth lenses, respectively.
Further, the wide-angle optical imaging lens further satisfies: 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: 0.9 < |f2/f5| < 1.2, wherein f2 and f5 are the focal lengths of the second lens and the fifth lens, respectively.
The beneficial technical effects of the invention are as follows:
Ten lenses are adopted, and the refractive index of each lens and the arrangement design of the surfaces are designed, so that the lens has a wide angle; the resolution is high, the level can reach 4K, the transfer function can reach 300lp/mm of high frequency, the contrast ratio is high, and the image quality is high; low color difference and high color reducibility; less distortion.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a first embodiment of the present invention;
FIG. 2 is a graph of MTF between 0.435 and 0.656 μm for example one of the present invention;
FIG. 3 is a schematic diagram of a color difference curve according to a first embodiment of the present invention;
FIG. 4 is a diagram illustrating curvature of field and distortion in accordance with a first embodiment of the present invention;
FIG. 5 is a schematic diagram of a second embodiment of the present invention;
FIG. 6 is a graph of MTF between 0.435 and 0.656 μm for 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 in accordance with a second embodiment of the present invention;
FIG. 9 is a schematic diagram of a third embodiment of the present invention;
FIG. 10 is a graph of MTF between 0.435 and 0.656 μm for example III of the present invention;
FIG. 11 is a color difference curve of a third embodiment of the present invention;
FIG. 12 is a diagram showing curvature of field and distortion in accordance with a third embodiment of the present invention;
FIG. 13 is a schematic diagram of a fourth embodiment of the present invention;
FIG. 14 is a graph of MTF between 0.435 and 0.656 μm for example four of the present invention;
FIG. 15 is a color difference curve of a fourth embodiment of the present invention;
FIG. 16 is a diagram showing curvature of field and distortion in accordance with a fourth embodiment of the present invention;
fig. 17 is a table showing the values of the relevant important parameters according to four embodiments of the present invention.
Detailed Description
For further illustration of the various embodiments, the invention is provided with the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments and together with the description, serve to explain the principles of the embodiments. With reference to these matters, one of ordinary skill in the art will understand other possible embodiments and advantages of the present invention. The components in the figures are not drawn to scale and like reference numerals are generally used to designate like components.
The invention will now be further described with reference to the drawings and detailed description.
The term "a lens having a positive refractive index (or negative refractive index)" as used herein means that the paraxial refractive index of the lens calculated by Gaussian optics theory 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 surface roughness determination of the lens can be performed by a determination method by a person of ordinary skill in the art, that is, by a sign of a radius of curvature (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 the lens data table (LENS DATA SHEET) of optical design software. When the R value is positive, the object side surface is judged to be convex; when the R value is negative, the object side surface is judged to be a concave surface. On the contrary, when the R value is positive, the image side surface is judged to be concave; when the R value is negative, the image side surface is determined to be convex.
The invention provides a wide-angle optical imaging lens, which sequentially comprises a first lens, a tenth lens and a third lens from an object side to an image side along an optical axis; the first lens element to the tenth lens element each comprise an object side surface facing the object side and passing the imaging light beam and an image side surface facing the image side and passing the imaging light beam.
The first lens has negative refractive power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface.
The second lens has negative refractive power, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface.
The third lens has negative refractive power, the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a concave surface.
The fourth lens element has positive refractive power, wherein an object-side surface of the fourth lens element is convex, and an image-side surface of the fourth lens element is convex.
The fifth lens element has positive refractive index, wherein an object-side surface of the fifth lens element is convex, and an image-side surface of the fifth lens element is convex.
The sixth lens element has positive refractive power, wherein an object-side surface of the sixth lens element is concave, and an image-side surface of the sixth lens element is convex.
The seventh lens has positive refractive index, and the image side surface of the seventh lens is a convex surface.
The eighth lens element has negative refractive power, wherein an object-side surface of the eighth lens element is concave, and an image-side surface of the eighth lens element is convex.
The ninth lens element has positive refractive power, wherein an object-side surface of the ninth lens element is convex, and an image-side surface of the ninth lens element is convex.
The tenth lens has negative refractive power, the object side surface of the tenth lens is a concave surface, and the image side surface of the tenth lens is a convex surface.
The third lens and the fourth lens are mutually glued and/or the seventh lens and the eighth lens are mutually glued and/or the ninth lens and the tenth lens are mutually glued; the wide-angle optical imaging lens has only ten lenses with refractive index.
Ten lenses are adopted, and the refractive index of each lens and the arrangement design of the surfaces are designed, so that the lens has a wide angle; the resolution is high, the level can reach 4K, the transfer function can reach 300lp/mm of high frequency, the contrast ratio is high, and the image quality is high; low color difference and high color reducibility; less distortion.
Preferably, the wide-angle optical imaging lens further satisfies: 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, R12 is the curvature radius of the image side surface of the first lens, the distortion of an optical system is further reduced, and the outer diameter of the first lens is controlled.
Preferably, the relative partial dispersion dPgF of the first lens is > 0.025, better enabling achromatism at multiple wavelengths.
Preferably, the wide-angle optical imaging lens further satisfies: r21 is less than 15mm, R22 is less than 5mm, wherein R21 and R22 are the curvature radius of the object side surface and the image side surface of the second lens respectively, and the distortion of an optical system is further reduced.
Preferably, the wide-angle optical imaging lens further satisfies: 1 < |f4/f3| < 1.5, wherein f3 and f4 are the focal lengths of the third lens and the fourth lens respectively, the resolution is optimized, and the chromatic aberration is reduced.
Preferably, the wide-angle optical imaging lens further satisfies: nd5 > 1.9, wherein nd5 is the refractive index of the fifth lens, further improving resolution.
Preferably, the wide-angle optical imaging lens further satisfies: and vd7 is more than or equal to 60, vd8 is less than or equal to 30, and vd7-vd8 is more than 30, wherein vd7 and vd8 are the dispersion coefficients of the seventh lens and the eighth lens respectively, and the combination of high dispersion and low dispersion can better realize multi-wavelength wide spectrum achromatism and optimize image quality.
Preferably, the wide-angle optical imaging lens further satisfies: and 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 the dispersion coefficients of the ninth lens and the tenth lens respectively, and the combination of high-low dispersion materials can better realize multi-wavelength wide-spectrum achromatization.
Preferably, the wide-angle optical imaging lens further satisfies: vd2 > 50, vd3 > 50, vd4 > 50, and vd6 > 50, wherein vd2 is the dispersion coefficient of the second lens, vd3 is the dispersion coefficient of the third lens, vd4 is the dispersion coefficient of the fourth lens, and vd6 is the dispersion coefficient of the sixth lens, further optimizing chromatic aberration.
Preferably, the wide-angle optical imaging lens further satisfies: 0.9 < |f2/f5| < 1.2, wherein f2 and f5 are the focal lengths of the second lens and the fifth lens respectively, the surface shape is controlled, and the chromatic aberration is optimized.
Preferably, the optical system further comprises an optical diaphragm, wherein the optical diaphragm is arranged between the fifth lens and the sixth lens, and the front five structures and the rear five structures further reduce distortion and improve system performance.
The wide-angle optical imaging lens of the present invention will be described in detail with specific examples.
Example 1
As shown in fig. 1, a wide-angle optical imaging lens includes, in order from an object side A1 to an image side A2 along an optical axis I, 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 imaging surface 130; the first lens element 1 to the tenth lens element 100 respectively comprise an object side surface facing the object side A1 and allowing the imaging light to pass therethrough, and an image side surface facing the image side A2 and allowing the imaging light to pass therethrough.
The first lens element 1 has a negative refractive power, wherein an object-side surface 11 of the first lens element 1 is convex, and an image-side surface 12 of the first lens element 1 is concave.
The second lens element 2 has a negative refractive power, wherein 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 power, wherein 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 power, wherein an object-side surface 41 of the fourth lens element 4 is convex, and an image-side surface 42 of the fourth lens element 4 is convex.
The fifth lens element 5 has a positive refractive power, wherein an object-side surface of the fifth lens element 51 is convex, and an image-side surface 52 of the fifth lens element 5 is convex.
The sixth lens element 6 has a positive refractive power, wherein an object-side surface 61 of the sixth lens element 6 is concave, and an image-side surface 62 of the sixth lens element 6 is convex.
The seventh lens element 7 has positive refractive power, and the object-side surface 71 of the seventh lens element 7 is convex, however, in some embodiments, the object-side surface 71 of the seventh lens element 7 can be planar or concave, and the image-side surface 72 of the seventh lens element 7 is convex.
The eighth lens element 8 has a negative refractive power, wherein 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 has a positive refractive power, wherein an object-side surface 91 of the ninth lens element 9 is convex, and an image-side surface 92 of the ninth lens element 9 is convex.
The tenth lens element 100 has a negative refractive power, an object-side surface 101 of the tenth lens element 100 is concave, and an image-side surface 102 of the tenth lens element 100 is convex.
In this embodiment, the third lens 3 and the fourth lens 4 are glued to each other, the seventh lens 7 and the eighth lens 8 are glued to each other, the ninth lens 9 and the tenth lens 100 are glued to each other, and three groups of lenses are used to achieve lower chromatic aberration, however, in some embodiments where chromatic aberration is not too low, only any one group of lenses may be glued to each other, such as the third lens 3 and the fourth lens 4 are glued to each other; or any two groups of lenses, 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 the present embodiment, the first lens 1 to the tenth lens 100 are all made of glass materials, but the present invention is not limited thereto, and in other embodiments, they may be made of plastic materials or the like.
Of course, in some embodiments, the aperture 110 may also be disposed between other lenses.
The detailed optical data of this particular example are shown in Table 1-1.
Table 1-1 detailed optical data for example one
The numerical values of the related conditional expressions of this embodiment are shown in fig. 17.
With reference to fig. 2, it can be seen from the figure that the transfer function can reach high frequency 300lp/mm, the resolution is high, the level of 4K is reached, and the contrast is high; referring to FIG. 3, it can be seen that the color difference is small, the color difference is less than 3 μm and the color reproducibility is high under the visible light wide spectrum of 435 nm-656 nm; the field curvature and distortion patterns are shown in fig. 4 (a) and (B), and the distortion is found to be-1.1%.
In this embodiment, the focal length f=2.7 mm, the aperture value fno=2.6, the image height imh=8 mm, the distance ttl=23.94 mm between the object side surface 11 of the first lens element 1 and the imaging surface 130 on the optical axis I, and the field angle fov=170°.
Example two
As shown in fig. 5, in this embodiment, the surface roughness and refractive index of each lens are the same as those of the first embodiment, and only the optical parameters such as the radius of curvature and the lens thickness of each lens surface are different.
The detailed optical data of this particular example are shown in Table 2-1.
Table 2-1 detailed optical data for example two
The numerical values of the related conditional expressions of this embodiment are shown in fig. 17.
With reference to fig. 6, it can be seen that the transfer function can reach high frequency 300lp/mm, the resolution is high, the level of 4K is reached, and the contrast is high; referring to FIG. 7, it can be seen that the color difference is small, the color difference is less than 3 μm and the color reproducibility is high under the visible light wide spectrum of 435 nm-656 nm; the field curvature and distortion diagram are shown in fig. 8 (a) and (B), and it can be seen that the distortion is small, namely-2.2%.
In this embodiment, the focal length f=2.7 mm, the aperture value fno=2.6, the image height imh=8 mm, the distance ttl=24.00 mm between the object side surface 11 of the first lens element 1 and the imaging surface 130 on the optical axis I, and the field angle fov=168°.
Example III
As shown in fig. 9, in this embodiment, the surface roughness and refractive index of each lens are the same as those of the first embodiment, and only the optical parameters such as the radius of curvature and the lens thickness of each lens surface are different.
The detailed optical data of this particular example are shown in Table 3-1.
Table 3-1 detailed optical data for example three
| Surface of the body | Radius of curvature/mm | Thickness/mm | Material of material | Refractive index | Abbe number | Focal length/mm | |
| - | Object plane | 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 | 6.261 | 2.00 | Glass | 2.00 | 25.44 | 5.68 |
| 52 | -57.478 | 0.71 | |||||
| 110 | Diaphragm | Infinity | 0.26 | ||||
| 61 | Sixth lens | -6.652 | 1.69 | Glass | 1.73 | 51.49 | 27.75 |
| 62 | -5.562 | 0.10 | |||||
| 71 | Seventh lens | 40.244 | 1.93 | Glass | 1.59 | 68.65 | 4.28 |
| 72 | -2.671 | 0 | |||||
| 81 | Eighth lens | -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 | Imaging surface | Infinity |
The numerical values of the related conditional expressions of this embodiment are shown in fig. 17.
With reference to fig. 10, it can be seen that the transfer function can reach high frequency 300lp/mm, the resolution is high, the level of 4K is reached, and the contrast is high; referring to FIG. 11, it can be seen that the color difference is small, the color difference is less than 3 μm and the color reproducibility is high under the visible light wide spectrum of 435 nm-656 nm; the field curvature and distortion chart are shown in fig. 12 (a) and (B), and it can be seen that the distortion is small, namely-1.8%.
In this embodiment, the focal length f=2.7 mm, the aperture value fno=2.6, the image height imh=8 mm, the distance ttl=24.09 mm between the object side surface 11 of the first lens element 1 and the imaging surface 130 on the optical axis I, and the field angle fov=168°.
Example IV
As shown in fig. 13, in this embodiment, the surface irregularities and refractive index of each lens are substantially the same as those of the first embodiment, and only the object side surface 71 of the seventh lens 7 is a concave surface, and the optical parameters such as the radius of curvature and the lens thickness of each lens surface are also different.
The detailed optical data of this particular example are shown in Table 4-1.
Table 4-1 detailed optical data for example four
| Surface of the body | Radius of curvature/mm | Thickness/mm | Material of material | Refractive index | Abbe number | Focal length/mm | |
| - | Object plane | 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 | 6.791 | 1.63 | Glass | 2.00 | 25.44 | 6.32 |
| 52 | -94.259 | 0.94 | |||||
| 110 | Diaphragm | Infinity | 0.34 | ||||
| 61 | Sixth lens | -5.967 | 1.73 | Glass | 1.75 | 52.34 | 22.16 |
| 62 | -4.954 | 0.33 | |||||
| 71 | Seventh lens | -108.012 | 1.07 | Glass | 1.59 | 68.62 | 4.72 |
| 72 | -2.749 | 0 | |||||
| 81 | Eighth lens | -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 | Imaging surface | Infinity |
The numerical values of the related conditional expressions of this embodiment are shown in fig. 17.
With reference to fig. 14, it can be seen that the transfer function can reach high frequency 300lp/mm, the resolution is high, the level of 4K is reached, and the contrast is high; referring to FIG. 15, it can be seen that the color difference is small, the color difference is less than 3 μm and the color reproducibility is high under the visible light wide spectrum of 435 nm-656 nm; the field curvature and distortion chart are shown in fig. 16 (a) and (B), and it can be seen that the distortion is small, namely-0.5%.
In this embodiment, the focal length f=2.7 mm, the aperture value fno=2.6, the image height imh=7.5 mm, the distance ttl=24.47 mm between the object side surface 11 of the first lens element 1 and the imaging surface 130 on the optical axis I, and the field angle fov=168 °.
The wide-angle optical imaging lens is suitable for the field of aerial photography main shooting 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 details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. The wide-angle optical imaging lens is characterized in that: the lens system comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens, wherein the first lens and the tenth lens are sequentially arranged from an object side to an image side along an optical axis; the first lens element to the tenth lens element each comprise an object side surface facing the object side and allowing the 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 has negative refractive index, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface;
The second lens has negative refractive index, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface;
the third lens has negative refractive index, the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a concave surface;
the fourth lens has positive refractive index, the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface;
The fifth lens has positive refractive index, the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface;
the sixth lens element has positive refractive index, wherein the object-side surface of the sixth lens element is concave, and the image-side surface of the sixth lens element is convex;
the seventh lens has positive refractive index, and the image side surface of the seventh lens is a convex surface;
the eighth lens has negative refractive power, the object side surface of the eighth lens is a concave surface, and the image side surface of the eighth lens is a convex surface;
the ninth lens has positive refractive index, the object side surface of the ninth lens is a convex surface, and the image side surface of the ninth lens is a convex surface;
the tenth lens has negative refractive power, the object side surface of the tenth lens is a concave surface, and the image side surface of the tenth lens is a convex surface;
the third lens and the fourth lens are mutually glued and/or the seventh lens and the eighth lens are mutually glued and/or the ninth lens and the tenth lens are mutually glued;
the wide-angle optical imaging lens has only ten lenses with refractive index;
The wide-angle optical imaging lens satisfies the following conditions: nd1 is equal to or greater than 1.9, D12/R12 is equal to or greater than 1.8, R21 is less than 15mm, R22 is less than 5mm, and the relative partial dispersion dPgF1 of the first lens is greater than 0.025, where nd1 is the refractive index of the first lens, D12 is the outer diameter of the image side of the first lens, R12 is the radius of curvature of the image side of the first lens, and R21 and R22 are the radii of curvature of the object side and the image side of the second lens, respectively.
2. The wide-angle optical imaging lens of claim 1, further comprising: 1 < |f4/f3| < 1.5, wherein f3 and f4 are the focal lengths of the third lens and the fourth lens, respectively.
3. The wide-angle optical imaging lens of claim 1, further comprising: nd5 > 1.9, wherein nd5 is the refractive index of the fifth lens.
4. The wide-angle optical imaging lens of claim 1, further comprising: vd7 is more than or equal to 60, vd8 is less than or equal to 30, and vd7-vd8 is more than 30, wherein vd7 and vd8 are the dispersion coefficients of the seventh lens and the eighth lens, respectively.
5. The wide-angle optical imaging lens of claim 1, further comprising: vd9 is greater than or equal to 65, vd10 is greater than or equal to 35, and vd9-vd10 is greater than 30, wherein vd9 and vd10 are the dispersion coefficients of the ninth and tenth lenses, respectively.
6. The wide-angle optical imaging lens of claim 1, further comprising: 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.
7. The wide-angle optical imaging lens of claim 1, further comprising: 0.9 < |f2/f5| < 1.2, wherein f2 and f5 are the focal lengths of the second lens and the fifth lens, respectively.
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| 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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| JP6266497B2 (en) * | 2014-11-25 | 2018-01-24 | 富士フイルム株式会社 | Imaging lens and imaging apparatus |
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