CN113419334A - Large-aperture laser radar receiving optical lens - Google Patents
Large-aperture laser radar receiving optical lens Download PDFInfo
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- CN113419334A CN113419334A CN202110613800.0A CN202110613800A CN113419334A CN 113419334 A CN113419334 A CN 113419334A CN 202110613800 A CN202110613800 A CN 202110613800A CN 113419334 A CN113419334 A CN 113419334A
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- 230000003287 optical effect Effects 0.000 title claims abstract description 41
- 230000005499 meniscus Effects 0.000 claims abstract description 13
- 238000003825 pressing Methods 0.000 claims abstract description 4
- 125000006850 spacer group Chemical group 0.000 claims description 9
- 230000004907 flux Effects 0.000 abstract description 9
- 238000009826 distribution Methods 0.000 description 3
- 238000005286 illumination Methods 0.000 description 3
- 230000004075 alteration Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000003384 imaging method Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000002834 transmittance Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 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
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/481—Constructional features, e.g. arrangements of optical elements
- G01S7/4816—Constructional features, e.g. arrangements of optical elements of receivers alone
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/0012—Optical design, e.g. procedures, algorithms, optimisation routines
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/02—Simple or compound lenses with non-spherical faces
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/021—Mountings, adjusting means, or light-tight connections, for optical elements for lenses for more than one lens
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/026—Mountings, adjusting means, or light-tight connections, for optical elements for lenses using retaining rings or springs
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Abstract
A large aperture lidar receiving optical lens comprising: the device comprises a main lens barrel, a front pressing ring, an optical lens group and a lens fixing structure which are arranged in the main lens barrel, and a photoelectric detector arranged behind the main lens barrel; an optical lens assembly comprising: the first lens, the second lens, the third lens, the band-pass filter, the fourth lens and the fifth lens are sequentially arranged in the main lens cone from left to right along the light incidence direction; the first lens is a biconcave lens, the second lens is a plano-convex lens, the third lens is a meniscus lens, the band-pass filter is a planar lens, the fourth lens is a meniscus lens, and the fifth lens is a meniscus aspheric lens. The invention shares 5 lenses, realizes a large aperture of 0.75 by reasonably distributing the focal power of each lens, and can improve the light flux collected by the lens compared with the prior art of 0.8 aperture, wherein the light flux is in direct proportion to the square of the reciprocal of the F number, so that the aperture is improved from 0.8 to 0.75, and the light flux can be improved by 1.306 times.
Description
[ technical field ] A method for producing a semiconductor device
The invention belongs to the technical field of optical lenses, and particularly relates to a large-aperture laser radar receiving optical lens.
[ background of the invention ]
The laser radar can form laser radar point cloud by transmitting and receiving laser beams and returning a large amount of data, and has the advantages of high angular resolution, long measuring distance, high reaction speed, high reliability and the like. The functions of detection, identification, classification, tracking and the like of the target object can be realized in automatic driving and intelligent detection. The main structure of the lidar can be divided into three major parts: the device comprises a transmitting module, a receiving module and a signal processing part. At present, the laser radar plays an important role in military affairs, and is more and more widely applied in the commercial field. Particularly in the vehicle-mounted field, the three-dimensional imaging laser radar adopts the pulse type measuring principle, so that the vehicle can measure the distance in real time and draw a three-dimensional map, and the three-dimensional imaging laser radar is an indispensable component in the technical fields of automatic navigation and unmanned driving.
Because the laser radar receiving lens needs to collect the light reflected by objects hundreds of meters away, the light is transmitted in a long distance, and the energy attenuation is large. Therefore, a lidar receiving lens with a large aperture is required to obtain more light energy. At present, few laser radar receiving lenses with large apertures exist, and Chinese invention patent CN111308635A discloses a 3D radar lens with an aperture of 0.8, wherein the length and the aperture of the lens are both large, a fourth lens (7) is a meniscus lens, the bending degree of the lens is large, the processing and manufacturing cost is high, and if the lens can be miniaturized and lightened, the lens can be applied to more fields, the aperture of a laser radar is further improved, and the lens is a key factor for improving the measuring distance of the laser radar.
The laser radar needs to perform a large amount of data processing on the collected return laser to form a laser radar point cloud so as to draw a three-dimensional graph. The energy distribution collected by the laser radar receiving lens is an important data base, and particularly, the energy distribution is uneven, so that the accuracy of the distribution of the laser radar point cloud is reduced. The laser radar lens on the current market is difficult to achieve high relative illumination uniformity.
The environment of the lidar lens is very harsh and complex no matter the lidar lens is applied to military or civil fields, so that the lidar lens is required to have high reliability and environmental temperature adaptability. The working temperature range of a conventional lens is-30 ℃ to 60 ℃. The lens of the automobile gauge is required to be between 40 ℃ below zero and 85 ℃. However, such a demand still cannot be satisfied for a long time in an extremely cold or hot place. Thus requiring a wider operating temperature range.
[ summary of the invention ]
The invention aims to solve the technical problem of providing a laser radar receiving optical lens with a large aperture.
The invention is realized by the following steps:
a large aperture lidar receiving optical lens comprising: the optical lens system comprises a main lens barrel, a front pressing ring, an optical lens group and a lens fixing structure which are arranged in the main lens barrel, and a photoelectric detector which is placed behind the main lens barrel;
the optical lens group includes: the first lens, the second lens, the third lens, the band-pass filter, the fourth lens and the fifth lens are sequentially arranged in the main lens cone from left to right along the light incidence direction;
the first lens is a biconcave lens, the second lens is a plano-convex lens, the third lens is a meniscus lens, the band-pass filter is a planar lens, the fourth lens is a meniscus lens, and the fifth lens is a meniscus aspheric lens;
the lens fixing structure includes: the first space ring, the second space ring, the third space ring, the fourth space ring and the fifth space ring are sequentially arranged in the main lens cone from left to right along the light incidence direction and used for limiting the space interval of the two lenses; the first spacer is positioned between the first lens and the second lens; the second spacer is positioned between the second lens and the third lens; the third space ring is positioned between the third lens and the band-pass filter; the fourth space ring is positioned between the band-pass filter and the fourth lens; the fifth spacer is positioned between the fourth lens and the fifth lens;
the photoelectric detector is used for receiving the light rays which pass through the optical lens from left to right along the incident direction of the light rays.
Further, each lens of the optical lens group satisfies the following condition:
the first lens: 1.6< n1<2.1, 20< v1<40, -600< R1< -400mm, 10< R2<40mm, 0.5< d1<3.5mm, -10< f1< -30mm, said second lens: 1.7< n2<2.2, 10< v2<30, R3 ∞ mm, -60< R4< -30mm, 4< d2<8mm, 40< f2<60mm, the third lens: 1.6< n3<2.1, 20< v3<40, 10< R5<40mm, 20< R6<50mm, 1< d3<5mm, -10< f3< -20mm, said bandpass filter: 1.4< n4<1.9, 20< v4<40, R7 ∞ mm, R8 ∞ mm, 1< d4<5mm, f4 ∞ mm, the fourth lens: 1.7< n5<2.2, 10< v5<30, 10< R9<40mm, 20< R10<50mm, 3< d5<7mm, 30< f5<50mm, the fifth lens: 1.6< n6<2.1, 20< v6<40, 10< R11<40mm, 30< R12<60mm, 5< d6<9mm, 30< f6<50 mm;
the refractive indexes of the first lens to the fifth lens are sequentially from n1 to n6 along the incident direction of light rays from left to right, the abbe coefficients of the first lens to the fifth lens are sequentially from v1 to v6, the curvature radii of the first lens to the fifth lens are sequentially from R1 to R12, the central thicknesses of the first lens to the fifth lens are sequentially from d1 to d6, and the effective focal lengths of the first lens to the fifth lens are sequentially from f1 to f 6.
Further, the fifth lens is an even-order aspheric lens, and the aspheric surface shape satisfies the following equation:
Z＝cy2/{1+√[1-(1+k)c2y2]}+α1y2+α2y4+α3y6+α4y8+α5y10+α6y12+α
7y14+α8y16where c is 1/R, R denotes a curvature radius of the lens, y denotes a radial coordinate of the lens, k denotes a conic coefficient, and α 1 to α 8 denote coefficients of the radial coordinate;
the radial coordinate coefficient of the fifth lens satisfies the following condition:
from left to right along the incident direction of light rays, the first surface of the fifth lens:
0<k1<20，1α1＝0，-1.0E-006<1α2<-1.0E-005，1.0E-007<1α3<1.0E-006，-1.0E-009<1α4<-1.0E-008，1.0E-011<1α5<1.0E-010，1.0E-012<1α6<1.0E-011，-1.0E-015<1α7<-1.0E-014，1α8＝0；
from left to right along the incident direction of the light rays, the second surface of the fifth lens is:
10<k2<30，2α1＝0，1.0E-004<2α2<1.0E-003，-1.0E-007<2α3<-1.0E-006，1.0E-008<2α4<1.0E-007，-1.0E-010<2α5<-1.0E-009，1.0E-011<2α6<1.0E-010，-1.0E-014<2α7<-1.0E-013，2α8＝0。
further, the distance between the photoelectric detector and the fifth lens is 6.8 mm; the effective image plane diameter of the photoelectric detector is 7.2mm at most.
The invention has the advantages that:
1. the invention provides a laser radar receiving lens with an aperture of 0.75, the lens shares 5 lenses, the large aperture of 0.75 is realized by reasonably distributing the focal power of each lens, compared with a 0.8 aperture in the prior art, the light flux collected by the lens can be improved, the light flux is in direct proportion to the square of the reciprocal of the F number, and therefore, the aperture is improved from 0.8 to 0.75, and the light flux can be improved by 1.306 times.
2. The invention provides a laser radar receiving lens with high uniformity of laser receiving energy, which controls the aspheric surface type by reasonably distributing the focal power of an optical element and ensures that light rays of each field uniformly irradiate on an image surface, thereby realizing high uniformity of the receiving energy and ensuring that the relative illumination is more than 98.5%.
3. The invention provides a laser radar receiving lens with a wide working temperature range, which can maintain good working performance under the severe condition of-80 ℃ to 130 ℃. The invention selects materials (aluminum and tungsten) with reasonable thermal expansion coefficient as the main lens cone and the space ring, so that the lens clearance of the integral optical system is changed at minus 80 ℃ to 130 ℃, the optical performance is not greatly reduced, the contrast of the MTF value of each view field at 20lp/mm is more than 0.3 at 20 ℃, minus 80 ℃ and 130 ℃, and the performance of the laser radar receiving lens at minus 80 ℃ to 130 ℃ can meet the use requirement.
4. The invention reduces the number of optical lenses and improves the optical transmittance of laser rays through reasonable design.
5. The invention uses a high-refractivity aspheric lens at the end of the optical lens system, thereby reducing the spherical aberration and the field curvature of the system and effectively improving the light spot focusing performance of the laser radar receiving lens.
[ description of the drawings ]
The invention will be further described with reference to the following examples with reference to the accompanying drawings.
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a graph of relative illuminance of the present invention.
FIG. 3 is a graph of the MTF function of the present invention at 20 ℃.
FIG. 4 is a graph of the MTF function at-80 ℃ in accordance with the present invention.
FIG. 5 is a graph of the MTF function of the present invention at 130 ℃.
[ detailed description ] embodiments
As shown in fig. 1, a large aperture lidar receiving optical lens includes: the lens-assembling device comprises a main lens barrel 1, a front pressing ring 2, an optical lens group and a lens fixing structure which are arranged in the main lens barrel 1, and a photoelectric detector 14 which is placed behind the main lens barrel 1.
An optical lens assembly comprising: the first lens 3, the second lens 4, the third lens 5, the band-pass filter 6, the fourth lens 7 and the fifth lens 8 are sequentially arranged in the main lens barrel 1 from left to right along the incident direction of light rays.
The first lens 3 is a biconcave lens, the second lens 4 is a plano-convex lens, the third lens 5 is a meniscus lens, the band-pass filter 6 is a planar lens, the fourth lens 7 is a meniscus lens, and the fifth lens 8 is a meniscus aspheric lens;
a lens holding structure comprising: a first space ring 9, a second space ring 10, a third space ring 11, a fourth space ring 12 and a fifth space ring 13 which are arranged in the main lens barrel 1 from left to right along the light incidence direction and used for limiting the space interval of the two lenses; the first spacer 9 is positioned between the first lens 3 and the second lens 4; the second spacer 10 is positioned between the second lens 4 and the third lens 5; the third space ring 11 is positioned between the third lens 5 and the band-pass filter 6; the fourth space ring 12 is positioned between the band-pass filter 6 and the fourth lens 7; the fifth spacer 13 is located between the fourth lens 7 and the fifth lens 8.
And the photoelectric detector 14 is used for receiving the light rays which pass through the optical lens from left to right along the incident direction of the light rays.
Each lens of the optical lens group satisfies the following condition:
first lens 3: 1.6< n1<2.1, 20< v1<40, -600< R1< -400mm, 10< R2<40mm, 0.5< d1<3.5mm, -10< f1< -30mm,
second lens 4: 1.7< n2<2.2, 10< v2<30, R3 ∞ mm, -60< R4< -30mm, 4< d2<8mm, 40< f2<60mm,
third lens 5: 1.6< n3<2.1, 20< v3<40, 10< R5<40mm, 20< R6<50mm, 1< d3<5mm, -10< f3< -20mm,
the band pass filter 6: 1.4< n4<1.9, 20< v4<40, R7 ∞ mm, R8 ∞ mm, 1< d4<5mm, f4 ∞ mm,
fourth lens 7: 1.7< n5<2.2, 10< v5<30, 10< R9<40mm, 20< R10<50mm, 3< d5<7mm, 30< f5<50mm,
fifth lens 8: 1.6< n6<2.1, 20< v6<40, 10< R11<40mm, 30< R12<60mm, 5< d6<9mm, 30< f6<50 mm;
in the light incidence direction from left to right, n1 to n6 sequentially represent refractive indexes of the first lens 3 to the fifth lens 8, v1 to v6 sequentially represent abbe coefficients of the first lens 3 to the fifth lens 8, R1 to R12 sequentially represent curvature radiuses of the first lens 3 to the fifth lens 8, d1 to d6 sequentially represent central thicknesses of the first lens 3 to the fifth lens 8, and f1 to f6 sequentially represent effective focal lengths of the first lens 3 to the fifth lens 8.
The fifth lens 8 is an even-order aspheric lens, and the aspheric surface shape satisfies the following equation:
Z＝cy2/{1+√[1-(1+k)c2y2]}+α1y2+α2y4+α3y6+α4y8+α5y10+α6y12+α
7y14+α8y16where c is 1/R, R denotes a curvature radius of the lens, y denotes a radial coordinate of the lens, k denotes a conic coefficient, and α 1 to α 8 denote coefficients of the radial coordinate;
the radial coordinate coefficient of the fifth lens 8 satisfies the following condition:
along the light incidence direction from left to right, the first surface of the fifth lens 8:
0<k1<20，1α1＝0，-1.0E-006<1α2<-1.0E-005，1.0E-007<1α3<1.0E-006，-1.0E-009<1α4<-1.0E-008，1.0E-011<1α5<1.0E-010，1.0E-012<1α6<1.0E-011，-1.0E-015<1α7<-1.0E-014，1α8＝0；
from left to right along the incident direction of light, the second surface of the fifth lens 8:
10<k2<30，2α1＝0，1.0E-004<2α2<1.0E-003，-1.0E-007<2α3<-1.0E-006，1.0E-008<2α4<1.0E-007，-1.0E-010<2α5<-1.0E-009，1.0E-011<2α6<1.0E-010，-1.0E-014<2α7<-1.0E-013，2α8＝0。
the distance between the photoelectric detector 14 and the fifth lens 8 is 6.8 mm; the effective image plane diameter of the photodetector 14 is 7.2mm at the maximum.
The technical parameters which can be realized by the laser radar receiving lens are as follows:
aperture: the ratio of F/# to #0.75,
relative illuminance: more than or equal to 98.5 percent,
image plane diameter: the thickness of the steel wire is less than or equal to 7.2mm,
total optical length: the thickness of the film is less than or equal to 55mm,
working temperature: -80 ℃ to 13, 0 ℃.
The aperture of the invention is 0.75, the lens shares 5 lenses, the large aperture of 0.75 is realized by reasonably distributing the focal power of each lens, compared with the 0.8 aperture in the prior art, the light flux collected by the lens can be improved, the light flux is in direct proportion to the square of the reciprocal of the F number, and therefore, the light flux of 1.306 times can be improved by increasing the aperture from 0.8 to 0.75. The invention controls the aspheric surface type by reasonably distributing the focal power of the optical element, ensures that the light of each field uniformly irradiates on the image surface, thereby realizing the high uniformity of the received energy and the relative illumination of more than 98.5 percent. The invention has wider working temperature range and can maintain good working performance under the severe condition of-80 ℃ to 130 ℃. The invention selects materials with reasonable thermal expansion coefficient as the main lens cone and the space ring, so that the lens clearance of the integral optical system is changed at minus 80 ℃ to 130 ℃, the optical performance is not greatly reduced, the contrast of MTF value of each view field at 20lp/mm is more than 0.3 at 20 ℃, minus 80 ℃ and 130 ℃, and the performance of the laser radar receiving lens at minus 80 ℃ to 130 ℃ can meet the use requirement. Through reasonable design, the number of optical lenses is reduced, and the optical transmittance of laser rays is improved. The invention uses a high-refractivity aspheric lens at the end of the optical lens system, reduces the spherical aberration and the field curvature of the system, and effectively improves the performance of the laser radar receiving lens
The above description is only an example of the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. A large aperture lidar receiving optical lens comprising: the optical lens system comprises a main lens barrel, a front pressing ring, an optical lens group and a lens fixing structure which are arranged in the main lens barrel, and a photoelectric detector which is placed behind the main lens barrel; the method is characterized in that:
the optical lens group includes: the first lens, the second lens, the third lens, the band-pass filter, the fourth lens and the fifth lens are sequentially arranged in the main lens cone from left to right along the light incidence direction;
the first lens is a biconcave lens, the second lens is a plano-convex lens, the third lens is a meniscus lens, the band-pass filter is a planar lens, the fourth lens is a meniscus lens, and the fifth lens is a meniscus aspheric lens;
the lens fixing structure includes: the first space ring, the second space ring, the third space ring, the fourth space ring and the fifth space ring are sequentially arranged in the main lens cone from left to right along the light incidence direction and used for limiting the space interval of the two lenses; the first spacer is positioned between the first lens and the second lens; the second spacer is positioned between the second lens and the third lens; the third space ring is positioned between the third lens and the band-pass filter; the fourth space ring is positioned between the band-pass filter and the fourth lens; the fifth spacer is positioned between the fourth lens and the fifth lens;
the photoelectric detector is used for receiving the light rays which pass through the optical lens from left to right along the incident direction of the light rays.
2. A large aperture lidar receiver optical lens of claim 1 wherein: each lens of the optical lens group satisfies the following condition:
the first lens: 1.6< n1<2.1, 20< v1<40, -600< R1< -400mm, 10< R2<40mm, 0.5< d1<3.5mm, -10< f1< -30mm, said second lens: 1.7< n2<2.2, 10< v2<30, R3 ∞ mm, -60< R4< -30mm, 4< d2<8mm, 40< f2<60mm, the third lens: 1.6< n3<2.1, 20< v3<40, 10< R5<40mm, 20< R6<50mm, 1< d3<5mm, -10< f3< -20mm, said bandpass filter: 1.4< n4<1.9, 20< v4<40, R7 ∞ mm, R8 ∞ mm, 1< d4<5mm, f4 ∞ mm, the fourth lens: 1.7< n5<2.2, 10< v5<30, 10< R9<40mm, 20< R10<50mm, 3< d5<7mm, 30< f5<50mm, the fifth lens: 1.6< n6<2.1, 20< v6<40, 10< R11<40mm, 30< R12<60mm, 5< d6<9mm, 30< f6<50 mm;
the refractive indexes of the first lens to the fifth lens are sequentially from n1 to n6 along the incident direction of light rays from left to right, the abbe coefficients of the first lens to the fifth lens are sequentially from v1 to v6, the curvature radii of the first lens to the fifth lens are sequentially from R1 to R12, the central thicknesses of the first lens to the fifth lens are sequentially from d1 to d6, and the effective focal lengths of the first lens to the fifth lens are sequentially from f1 to f 6.
3. A large aperture lidar receiver optical lens of claim 2 wherein:
the fifth lens is an even-order aspheric lens, and the surface shape of the aspheric surface meets the following equation:
Z＝cy2/{1+√[1-(1+k)c2y2]}+α1y2+α2y4+α3y6+α4y8+α5y10+α6y12+α7y14+α8y16where c is 1/R, R denotes a curvature radius of the lens, y denotes a radial coordinate of the lens, k denotes a conic coefficient, and α 1 to α 8 denote coefficients of the radial coordinate;
the radial coordinate coefficient of the fifth lens satisfies the following condition:
from left to right along the incident direction of light rays, the first surface of the fifth lens:
0<k1<20，1α1＝0，-1.0E-006<1α2<-1.0E-005，1.0E-007<1α3<1.0E-006，-1.0E-009<1α4<-1.0E-008，1.0E-011<1α5<1.0E-010，1.0E-012<1α6<1.0E-011，-1.0E-015<1α7<-1.0E-014，1α8＝0；
from left to right along the incident direction of the light rays, the second surface of the fifth lens is:
10<k2<30，2α1＝0，1.0E-004<2α2<1.0E-003，-1.0E-007<2α3<-1.0E-006，1.0E-008<2α4<1.0E-007，-1.0E-010<2α5<-1.0E-009，1.0E-011<2α6<1.0E-010，-1.0E-014<2α7<-1.0E-013，2α8＝0。
4. a large aperture lidar receiver optical lens of claim 3 wherein: the distance between the photoelectric detector and the fifth lens is 6.8 mm; the effective image plane diameter of the photoelectric detector is 7.2mm at most.
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| CN116299982A (en) * | 2023-05-11 | 2023-06-23 | 宁波永新光学股份有限公司 | Long-focus receiving optical system of low-temperature drift laser radar |
Citations (6)
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| CN116299982A (en) * | 2023-05-11 | 2023-06-23 | 宁波永新光学股份有限公司 | Long-focus receiving optical system of low-temperature drift laser radar |
| CN116299982B (en) * | 2023-05-11 | 2023-09-05 | 宁波永新光学股份有限公司 | Long-focus receiving optical system of low-temperature drift laser radar |
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