CN115248496A - High-definition optical lens and high-performance laser radar - Google Patents

High-definition optical lens and high-performance laser radar Download PDF

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Publication number
CN115248496A
CN115248496A CN202211167735.4A CN202211167735A CN115248496A CN 115248496 A CN115248496 A CN 115248496A CN 202211167735 A CN202211167735 A CN 202211167735A CN 115248496 A CN115248496 A CN 115248496A
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lens
optical
optical lens
power
focal length
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CN115248496B (en
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邢圆圆
刘凯
丁洪兴
方勇军
邓志吉
丁乃英
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Zhejiang Dahua Technology Co Ltd
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Zhejiang Dahua Technology Co Ltd
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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
    • 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
    • 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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  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
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  • Computer Networks & Wireless Communication (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
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Abstract

The application provides a high definition optical lens and high performance laser radar, optical lens includes: include in proper order from the thing side to image side along the optical axis: a first lens of negative optical power; a second lens having positive refractive power; a third lens of negative optical power; a fourth lens of positive optical power; a fifth lens of negative power; a sixth lens of positive refractive power; a seventh lens of positive refractive power; an eighth lens of positive refractive power; an optical filter; an imaging plane; wherein a combined focal length of the third lens and the fourth lens
Figure 655822DEST_PATH_IMAGE001
Focal length of optical lens
Figure 728820DEST_PATH_IMAGE002
Angle of view of optical lens
Figure 759093DEST_PATH_IMAGE003
The following relation is satisfied:
Figure 215744DEST_PATH_IMAGE004
. The optical lens adopts 8 optical lenses with specific structures, and the optical lenses are sequentially arranged from the object side to the image side, and the optical lens has high distortion control and excellent imaging characteristics through the distribution and combination of specific focal power of each optical lens, so that the optical lens realizes low cost, large target surface and high imaging definition.

Description

High-definition optical lens and high-performance laser radar
Technical Field
The application mainly relates to the field of optical imaging, in particular to a high-definition optical lens and a high-performance laser radar.
Background
Thanks to the rapid development of automatic driving in recent years, the vehicle-mounted optical lens is increasingly applied in the field of automatic driving, especially in the field of vehicle-mounted lenses, laser radars and the like, and with the rapid development of the field of laser radars, the following problems still exist in the existing optical imaging lens: the existing optical prime lens has a small imaging target surface, most of which is concentrated on 1/2.7 inch, and cannot meet the existing use requirements; the conventional fixed focus lens on the market has a small aperture; the optical lenses of the lens are more in number, the imaging quality is improved, the size of the whole lens is increased, and the design requirement for miniaturization cannot be met.
Disclosure of Invention
In order to solve the above technical problems, the present application provides a high-definition optical lens and a high-performance laser radar.
To solve the above-mentioned problems, the present application provides a high-definition optical lens, which sequentially includes, from an object side to an image side along an optical axis: a first lens of negative optical power; a second lens of positive optical power; a third lens of negative optical power; a fourth lens of positive optical power; a fifth lens of negative power; a sixth lens of positive refractive power; a seventh lens of positive optical power; an eighth lens of positive refractive power; an optical filter; an imaging plane;
wherein a combined focal length of the third lens and the fourth lens
Figure 579357DEST_PATH_IMAGE001
Focal length of the optical lens
Figure 840706DEST_PATH_IMAGE002
Angle of view of the optical lens
Figure 886022DEST_PATH_IMAGE003
The following relation is satisfied:
Figure 546810DEST_PATH_IMAGE004
。
wherein a combined focal length of the third lens and the fourth lens
Figure 626762DEST_PATH_IMAGE001
Focal length of the optical lens
Figure 449224DEST_PATH_IMAGE002
Angle of view of the optical lens
Figure 981837DEST_PATH_IMAGE003
The following relation is satisfied:
Figure 446316DEST_PATH_IMAGE005
。
wherein the optical lens further includes an aperture stop disposed between the fourth lens and the fifth lens.
The second lens is a biconvex lens, and the image side surface of the second lens is a convex surface at the paraxial position;
the seventh lens is a meniscus lens; the object side surface of the seventh lens is concave at the paraxial region.
The center curvature radius of the image side surface of the seventh lens element is R13, the center curvature radius of the object side surface of the eighth lens element is R14, and the following relation is satisfied:
Figure 380774DEST_PATH_IMAGE006
。
wherein the focal length of the second lens is
Figure 639717DEST_PATH_IMAGE007
The focal length of the seventh lens is
Figure 394047DEST_PATH_IMAGE008
And satisfies the following relation:
Figure 645905DEST_PATH_IMAGE009
Figure 434870DEST_PATH_IMAGE010
。
the optical back focus of the optical lens is BFL, the total system length of the optical lens is TTL, and the following relational expression is satisfied:
Figure 130293DEST_PATH_IMAGE011
。
wherein the Abbe number of the glass material of the first lens is
Figure 637498DEST_PATH_IMAGE012
The abbe number of the glass material of the third lens is
Figure 443780DEST_PATH_IMAGE013
The Abbe number of the fifth lens is
Figure 352830DEST_PATH_IMAGE014
And satisfies the following relation:
Figure 953576DEST_PATH_IMAGE015
Figure 698809DEST_PATH_IMAGE016
Figure 43203DEST_PATH_IMAGE017
。
wherein the refractive index of the glass material of the fourth lens is
Figure 806759DEST_PATH_IMAGE018
The refractive index of the glass material of the sixth lens is
Figure 843985DEST_PATH_IMAGE019
The refractive index of the glass material of the eighth lens is
Figure 60203DEST_PATH_IMAGE020
And satisfies the following relation:
Figure 208288DEST_PATH_IMAGE021
Figure 826351DEST_PATH_IMAGE022
Figure 768899DEST_PATH_IMAGE023
。
wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are glass spherical lenses;
the eighth lens is an aspheric lens.
The first lens is a biconcave lens, the second lens is a biconvex lens, the third lens is a meniscus lens, the fourth lens is a meniscus lens, the fifth lens is a biconcave lens, the sixth lens is a biconvex lens, the seventh lens is a meniscus lens, and the eighth lens is a biconvex lens.
In order to solve the above technical problem, the present application provides a high performance laser radar, which includes the above optical lens
Different from the prior art, the high-definition optical lens provided in the present application sequentially includes, from an object side to an image side along an optical axis: a first lens of negative optical power; a second lens of positive optical power; a third lens of negative optical power; a fourth lens of positive optical power; a fifth lens of negative power; a sixth lens of positive refractive power; a seventh lens of positive optical power; an eighth lens of positive refractive power; an optical filter; an imaging plane; wherein a combined focal length of the third lens and the fourth lens
Figure 472413DEST_PATH_IMAGE001
Focal length of optical lens
Figure 407877DEST_PATH_IMAGE002
Angle of view of optical lens
Figure 146026DEST_PATH_IMAGE003
The following relation is satisfied:
Figure 525054DEST_PATH_IMAGE004
. Through the lens arrangement and parameter setting, 8 optical lenses with specific structural shapes are adopted and are sequentially arranged from the object side to the image side according to a specific sequence, and through the distribution and combination of specific focal powers of the optical lenses, the optical lens has high distortion control and excellent imaging characteristics, so that the optical lens achieves the effects of low cost, large target surface and high imaging definition.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts. Wherein:
fig. 1 is a schematic structural diagram of an embodiment of an optical lens provided in the present application;
FIG. 2 is a graph of field curvature and distortion in the visible band for a first embodiment of an optical lens provided herein;
fig. 3 is a graph of an optical transfer function (MTF) of a first embodiment of an optical lens provided in the present application in a normal temperature state in a visible light band;
FIG. 4 is a diagram of a lateral fan in the visible band for a first embodiment of an optical lens provided herein;
FIG. 5 is a dot-column diagram of a first embodiment of an optical lens provided herein in the visible wavelength band;
fig. 6 is a graph of an optical transfer function (MTF) of a second embodiment of an optical lens provided in the present application in a normal temperature state in a visible light band;
FIG. 7 is a graph of field curvature and distortion in the visible band for a second embodiment of an optical lens provided herein;
FIG. 8 is a diagram of a lateral fan in the visible band for a second embodiment of an optical lens provided herein;
FIG. 9 is a plot of a transverse fan pattern in the visible wavelength band for a second embodiment of an optical lens provided herein;
fig. 10 is a schematic structural diagram of an embodiment of a lidar provided in the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terms "first," "second," "third," "fourth," and the like in the description and claims of this application and in the above-described drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an optical lens according to an embodiment of the present disclosure.
As shown in fig. 1, the details are as follows:
the optical lens 10 in this embodiment includes 8 lens elements, specifically, the left side is an object side, and the right side is an image side, and the optical lens 10 sequentially includes, from the object side to the image side along an optical axis: a first lens L1 of negative refractive power; a second lens L2 of positive refractive power; a third lens L3 of negative refractive power; a fourth lens L4 of positive refractive power; a negative-power fifth lens L5; a sixth lens L6 of positive refractive power; a seventh lens L7 of positive refractive power; and an eighth lens L8 of positive refractive power.
Alternatively, an optical element such as an optical filter (filter) GF may be disposed between the eighth lens element L8 and the image plane.
Optionally, in a specific embodiment of the present application, the first lens element L1 is a biconcave lens element, the second lens element L2 is a biconvex lens element, the third lens element L3 is a meniscus lens element, the fourth lens element L4 is a meniscus lens element, the fifth lens element L5 is a biconcave lens element, the sixth lens element L6 is a biconvex lens element, the seventh lens element L7 is a meniscus lens element, and the eighth lens element L8 is a biconvex lens element. In other embodiments of the present application, the lens may also be other lenses capable of exhibiting the same positive power or negative power, and various combinations that may be realized are not necessarily listed here.
In an embodiment provided by the present application, a combined focal length of the third lens L3 and the fourth lens L4 is defined
Figure 450285DEST_PATH_IMAGE001
The focal length of the optical lens 10 is
Figure 940172DEST_PATH_IMAGE002
The angle of view of the optical lens 10 is
Figure 267248DEST_PATH_IMAGE003
The above data satisfy the following relation:
Figure 817178DEST_PATH_IMAGE004
。
in another embodiment provided herein, a combined focal length of the third lens and the fourth lens is defined
Figure 495284DEST_PATH_IMAGE001
The focal length of the optical lens 10 is
Figure 523283DEST_PATH_IMAGE002
The field angle of the optical lens 10 is
Figure 970445DEST_PATH_IMAGE003
And satisfies the following relation:
Figure 176430DEST_PATH_IMAGE005
。
specifically, in the following second specific embodiment, the above-described lens parameters of the optical lens 10 satisfy:
Figure 341832DEST_PATH_IMAGE024
. In the following first specific embodiment, the above-described lens parameters of the optical lens 10 satisfy:
Figure 173522DEST_PATH_IMAGE025
。
it should be noted that, in other possible embodiments, the present application is also applicable to provide other optical lenses 10 according to the above lens parameter relation, which is not listed here.
Through the lens arrangement and parameter setting, 8 optical lenses with specific structural shapes are adopted and are sequentially arranged from the object side to the image side according to a specific sequence, and through the distribution and combination of specific focal powers of the optical lenses, the optical lens 10 has high distortion control and excellent imaging characteristics, so that the optical lens 10 realizes low cost, large target surface, large aperture and high imaging definition.
The central curvature radius of the image side surface of the seventh lens is
Figure 475190DEST_PATH_IMAGE026
The center curvature radius of the object side surface of the eighth lens is
Figure 101343DEST_PATH_IMAGE027
And satisfies the following relation:
Figure 754041DEST_PATH_IMAGE006
。
specifically, in the following first specific embodiment, the above-described lens parameters of the optical lens 10 satisfy:
Figure 389422DEST_PATH_IMAGE028
. In the following second specific embodiment, the above-described lens parameters of the optical lens 10 satisfy:
Figure 545597DEST_PATH_IMAGE029
50。
it should be noted that, in other possible embodiments, the present application is also applicable to provide other optical lenses 10 according to the above lens parameter relation, which is not listed here. The second lens of the optical lens provided by the application has a focal length of
Figure 342652DEST_PATH_IMAGE007
Said seventh transmittanceFocal length of the mirror is
Figure 217067DEST_PATH_IMAGE008
And satisfies the following relation:
Figure 905406DEST_PATH_IMAGE009
；
Figure 181667DEST_PATH_IMAGE010
。
specifically, in the following first specific embodiment, the above-described lens parameters of the optical lens 10 satisfy:
Figure 415202DEST_PATH_IMAGE030
，
Figure 511334DEST_PATH_IMAGE031
. In the following second specific embodiment, the above-described lens parameters of the optical lens 10 satisfy:
Figure 488517DEST_PATH_IMAGE032
12，
Figure 619284DEST_PATH_IMAGE033
。
it should be noted that, in other possible embodiments, the present application is also applicable to provide other optical lenses 10 according to the above lens parameter relation, which is not listed here.
The optical lens 10 of the present application has an optical back focus of
Figure 23721DEST_PATH_IMAGE034
The total system length of the optical lens 10 is
Figure 872728DEST_PATH_IMAGE035
And satisfies the following relation:
Figure 388023DEST_PATH_IMAGE011
。
specifically, in the first specific embodiment below,the above lens parameters of the optical lens 10 satisfy:
Figure 389608DEST_PATH_IMAGE036
. In the following second specific embodiment, the above-described lens parameters of the optical lens 10 satisfy:
Figure 699367DEST_PATH_IMAGE037
。
it should be noted that, in other possible embodiments, the present application is also applicable to provide other optical lenses 10 according to the above lens parameter relation, which is not listed here.
The Abbe number of the glass material of the first lens L1 is defined as
Figure 35670DEST_PATH_IMAGE012
The third lens element L3 is made of glass having an Abbe number of
Figure 354656DEST_PATH_IMAGE013
Abbe number of glass material of the fifth lens element L5
Figure 460015DEST_PATH_IMAGE014
(ii) a Refractive index of glass material of the fourth lens element L4
Figure 206254DEST_PATH_IMAGE018
The refractive index of the glass material of the sixth lens element L6 is
Figure 764275DEST_PATH_IMAGE019
The refractive index of the glass material of the eighth lens element L8 is
Figure 886951DEST_PATH_IMAGE020
。
The present application provides an optical lens 10 that satisfies the following relational expression:
Figure 846817DEST_PATH_IMAGE015
；
Figure 498378DEST_PATH_IMAGE016
；
Figure 58542DEST_PATH_IMAGE017
；
Figure 719330DEST_PATH_IMAGE021
；
Figure 533702DEST_PATH_IMAGE022
；
Figure 887323DEST_PATH_IMAGE023
。
specifically, in the following first specific embodiment, the above-described lens parameters of the optical lens 10 satisfy:Vd1=47.20， Vd3=17.98，Vd5=23.96，Nd4=1.50，Nd6=1.62，Nd8=1.58。in the following second specific embodiment, the above-described lens parameters of the optical lens 10 satisfy:Vd1=35.50，Vd3=17.94，Vd5=21.51；Nd4=1.53，Nd6=1.60，Nd8= 1.53。
it should be noted that, in other possible embodiments, the present application is also applicable to provide other optical lenses 10 according to the above lens parameter relation, which is not listed here.
The following is a first specific example provided in the present application, and table 1 shows parameters, including a curvature radius, of each lens component of the optical lens 10 provided in the present exampleRCenter thickness ofTcRefractive index ofNdAbbe constantVdAnd coefficient of conicityk。
The mirror numbers are mirror numbers of the lenses from left to right in the optical lens 10 shown in fig. 1.
The specific parameters are as follows:
TABLE 1 optical lens first embodiment lens parameter Table
Figure 154357DEST_PATH_IMAGE038
Specifically, in the present embodiment, the focal length of the optical lens 10 is defined as
Figure 618836DEST_PATH_IMAGE002
The focal length of the cemented lens group G1 is
Figure 287715DEST_PATH_IMAGE001
The field angle of the lens system is
Figure 812237DEST_PATH_IMAGE003
To satisfy
Figure 832146DEST_PATH_IMAGE025
，Angle of view
Figure 569157DEST_PATH_IMAGE003
=77.3 °, can realize the advantages of large target surface, high imaging definition and wide application range.
In the present embodiment, the abbe number of the glass material of the first lens L1 of the optical lens 10Vd1=47.20Abbe number of glass material of the third lens L3Vd3=17.98Abbe number of glass material of the fifth lens element L5Vd5=23.96Refractive index of glass material of the fourth lens element L4Nd4=1.50Refractive index of glass material of the sixth lens element L6Nd6=1.62Refractive index of glass material of the eighth lens element L8Nd8=1.58。
Specifically, in the field of optical imaging, the abbe number is used for measuring the light color degree of a transparent medium, and the larger the refractive index of the medium is, the more serious the dispersion is, and the smaller the abbe number is; conversely, the smaller the refractive index of the medium, the more slight the dispersion and the larger the Abbe number. The lens using the above parameters also has excellent control of spherical aberration and dispersion.
Define the focal length of the second lens L2 asf2The focal length of the seventh lens L7 isf7. Focal length of the second lens L2 of the optical lens 10f2=9.33Of the focal length of the seventh lens L7f7=28.77. Through reasonable distribution of focal length, the image pickup optical lens 10 has better imaging quality and lower sensitivity.
The central curvature radius of the object side surface of the seventh lens L7 is defined as R13, and the central curvature radius of the image side surface of the eighth lens L8 is defined as R14, so that the requirements ofThe following relationships:
Figure 108854DEST_PATH_IMAGE028
the shapes of the seventh lens element L7 and the eighth lens element L8 are defined, and the degree of deflection of light rays passing through the lens elements can be reduced within the range of the relational expression, thereby effectively reducing aberration.
Defining the optical back focus of the optical lens 10 in the present application asBFLThe total system length of the optical lens 10 isTTLAnd the following relation is satisfied between the two:
Figure 804278DEST_PATH_IMAGE036
。
the optical total length is the distance from the axis incident light to the sensor photosensitive surface from the lens, the optical back focus is the distance from the light ray to the sensor photosensitive surface from the last lens surface of the lens, and the mechanical total length of the lens is limited not to exceed 32mm through the ratio, so that the miniaturization requirement is met.
Define the aperture of the optical lens 10 asFNOThe optical lens 10 diaphragm provided in this embodimentFNO=1.65, the aperture is bigger, can be suitable for the control demand under the low light level condition.
As shown in fig. 2, fig. 2 is a graph of curvature of field and distortion in the visible light band of the first specific embodiment of the optical lens provided by the present application. The optical distortion of the optical lens 10 is only-19.2%, the distortion is set to balance the focal length, the field angle and the size of the corresponding camera target surface, and the deformation caused by the distortion can be corrected through post image processing.
The size of an imaging surface of the device is phi 8.0mm, a sensor (CCD/CMOS) camera can be supported, and the requirement of high resolution of the device is met.
The eighth lens L8 in this embodiment is an aspheric lens. The aspheric conic coefficients can be defined by the following aspheric equation, but are not limited to the following representation:
Figure 45903DEST_PATH_IMAGE039
wherein, the first and the second end of the pipe are connected with each other,Zis a non-ballNoodleZA radial axial rise;rheight of the aspheric surface; c is the curvature of the fitting sphere, and the numerical value is the reciprocal of the curvature radius;kis the fitting cone coefficient;A-Gthe coefficients are the coefficients of the 4 th, 6 th, 8 th, 10 th, 12 th, 14 th and 16 th order terms of the aspheric surface polynomial.
TABLE 2 parameter Table
Mirror surface serial number A B C D E F G
14 1.203E-06 4.671E-08 4.275E-09 1.247E-10 1.529E-12 -5.599E-14 -4.269E-15
15 6.043E-06 -4.460E-07 -6.093E-09 3.809E-10 2.609E-11 4.230E-13 -3.061E-14
Alternatively, in an embodiment of the present application, the optical lens 10 is provided with an aperture STOP (STOP) disposed between the fourth lens L4 and the fifth lens L5.
Referring to fig. 3, fig. 3 is a graph of an optical transfer function (MTF) of a first embodiment of an optical lens provided in the present application in a normal temperature state of a visible light band.
As shown in fig. 3, an optical transfer function (MTF) graph of the optical lens 10 provided by the present application in a normal temperature state in a visible light portion is smooth and concentrated, and an average MTF value of a full field of view (half image height Y' =4.0 mm) reaches 0.3 or more, so that the optical lens 10 can meet a high imaging requirement.
With continuing reference to fig. 3, as shown in fig. 3, the curvature of field of the optical lens 10 provided by the present application is controlled within ± 0.05 mm. The curvature of field is also called as "field curvature". When the lens has field curvature, the intersection point of the whole light beam is not coincident with an ideal image point, and although a clear image point can be obtained at each specific point, the whole image plane is a curved surface. T represents the meridian field curvature, and S represents the sagittal field curvature. The field curvature curve shows the distance of the current focal plane or image plane to the paraxial focal plane as a function of the field of view coordinates, and the meridional field curvature data is the distance from the currently determined focal plane to the paraxial focal plane measured along the Z axis and measured in the meridional (YZ plane). Sagittal curvature of field data measures distances measured in a plane perpendicular to the meridian plane, the base line in the schematic is on the optical axis, the top of the curve represents the maximum field of view (angle or height), and no units are set on the vertical axis, since the curve is always normalized by the maximum radial field of view.
Referring to fig. 3, the distortion of the optical lens 10 provided by the present application is preferably controlled within-20%. Generally, lens distortion is a general term of intrinsic perspective distortion of an optical lens, that is, distortion caused by perspective, which is very unfavorable for the imaging quality of a photograph, and after all, the purpose of photography is to reproduce rather than exaggerate, but because the distortion is intrinsic characteristics of the lens (converging light rays of a convex lens and diverging light rays of a concave lens), the distortion cannot be eliminated, and only can be improved.
The distortion of the optical lens 10 provided by the embodiment is only-19.2%, the distortion is set to balance the focal length, the field angle and the size of the target surface of the corresponding camera, and the deformation caused by the distortion can be corrected through post-image processing.
Referring to fig. 4, fig. 4 is a transverse light fan diagram of a first embodiment of an optical lens provided in the present application in the visible light band. As shown in fig. 4, the optical lens 10 provided by the present application has a more concentrated curve in the optical fan diagram, and also has excellent control of spherical aberration and dispersion.
Referring to fig. 5, fig. 5 is a dot-column diagram of a first embodiment of an optical lens provided by the present application in the visible light band. As shown in fig. 5, the optical lens 10 provided by the present application has a small spot radius, is relatively concentrated, and has excellent corresponding aberration and coma.
The following is a second specific embodiment provided in the present application, and table 3 is parameters of each lens component of the optical lens 10 provided in the present embodiment, including the radius of curvatureRCenter thicknessTcRefractive index ofNdAbbe constantVdAnd coefficient of conicityk。
The mirror numbers are mirror numbers of the lenses from left to right in the optical lens 10 shown in fig. 1.
TABLE 3 optical lens second embodiment lens parameter Table
Figure 852185DEST_PATH_IMAGE040
Note that the mirror surface numbers in table 3 are the surface numbers of the lenses from left to right in the lens configuration diagram shown in fig. 1.
Specifically, in the present embodiment, the focal length of the optical lens 10 is defined asfThe focal length of the cemented lens group G1 is
Figure 761235DEST_PATH_IMAGE001
The field angle of the lens system isFOVSatisfy the following requirements
Figure 96402DEST_PATH_IMAGE024
Angle of viewFOV=77.3°The advantages of large target surface, high imaging definition and wide application range can be realized.
Define the focal length of the second lens L2 asf2The focal length of the seventh lens L7 isf7. Focal length of the second lens L2 of the optical lens 10f2=9.33Of the focal length of the seventh lens L7f7=28.77. Through reasonable distribution of focal length, the shooting optical lens 10 has better imaging quality and lower sensitivity.
In the present embodiment, the abbe number of the glass material of the first lens L1 of the optical lens 10Vd1=35.50, abbe number of glass material of third lens L3Vd3=17.94Abbe number of glass material of the fifth lens element L5Vd5=21.51(ii) a Refractive index of glass material of fourth lens L4 of optical lens 10Nd4=1.53Refractive index Nd6=1.60 of the glass material of the sixth lens L6, and refractive index Nd6 of the glass material of the eighth lens L8Nd8=1.53。
Define the focal length of the second lens L2 asf2The focal length of the seventh lens L7 isf7. Focal length of the second lens L2 of the optical lens 10f2=9.12F7=28.84 of the focal length of the seventh lens L7; through reasonable distribution of focal length, the shooting optical lens 10 has better imaging quality and lower sensitivity.
The focal length of the second lens L2 is defined as f2, and the focal length of the seventh lens L7 is defined as f7. Focal length of the second lens L2 of the optical lens 10f2=9.33Of the focal length of the seventh lens L7f7=28.77. Through reasonable distribution of focal length, the shooting optical lens 10 has better imaging quality and lower sensitivity.
The center radius of curvature of the object side surface of the seventh lens L7 is defined asR13The center radius of curvature of the image-side surface of the eighth lens element L8 isR14The following relation is satisfied:
Figure 90903DEST_PATH_IMAGE041
the shapes of the seventh lens element L7 and the eighth lens element L8 are defined, and the degree of deflection of the light passing through the lens elements can be reduced within the range of the above relational expression, thereby effectively reducing the aberration.
Defining the optical back focus of the optical lens 10 in the present application asBFLThe total system length of the optical lens 10 isTTLAnd the following relation is satisfied between the two:
Figure 435296DEST_PATH_IMAGE037
. Wherein, optics total length is the distance that axle incident light begins to sensor photosurface from getting into the camera lens, and optics back focus indicates the distance that light leaves last piece lens surface of camera lens to sensor photosurface, restricts through this ratio, and camera lens machinery total length is no longer than 32mm, satisfies the miniaturization demand.
Define the aperture of the optical lens 10 asFNOThe optical lens 10 diaphragm provided in this embodimentFNO≤1.65，The aperture is bigger, can be suitable for the control demand under the low light level condition.
The size of an imaging surface of the device is phi 8.0mm, a sensor (CCD/CMOS) camera can be supported, and the requirement of high resolution of the device is met.
The eighth lens L8 in the embodiment of the present application is an aspheric lens.
The aspheric conic coefficients can be defined by the following aspheric equation, but are not limited to the following representation:
Figure 198853DEST_PATH_IMAGE039
wherein, the first and the second end of the pipe are connected with each other,Zis asphericZA sagittal axial rise;rheight of the aspheric surface;cthe curvature of the fitting sphere is numerically the reciprocal of the curvature radius;kis the fitting cone coefficient; A-G are aspheric polynomial4, 6, 8, 10, 12, 14, 16 term coefficients.
TABLE 4 parameter Table
Mirror surface serial number A B C D E F G
14 4.025E-06 -1.635E-07 4.510E-09 4.390E-10 3.414E-12 -2.331E-13 -7.886E-15
15 3.381E-05 -7.265E-07 -1.769E-08 7.947E-10 5.229E-11 8.545E-13 -8.115E-14
Referring to fig. 6, fig. 6 is a graph illustrating an optical transfer function (MTF) of a second embodiment of an optical lens provided in the present application in a normal temperature state in a visible light band.
As shown in fig. 6, an optical transfer function (MTF) graph of the optical lens 10 provided by the present application in a normal temperature state in a visible light portion is smooth and concentrated, and an average MTF value of a full field of view (half image height Y' =4.0 mm) reaches 0.3 or more, so that the optical lens 10 can meet a high imaging requirement.
Further, please refer to fig. 7, fig. 7 is a graph of field curvature and distortion of a visible light band of a second embodiment of the optical lens provided by the present application.
As shown in fig. 7, the curvature of field of the optical lens 10 provided by the present application is controlled within ± 0.05 mm. The curvature of field is also called as "field curvature". When the lens has field curvature, the intersection point of the whole light beam is not coincident with an ideal image point, and although a clear image point can be obtained at each specific point, the whole image plane is a curved surface.
Wherein T represents the meridional field curvature and S represents the sagittal field curvature. The field curvature curve shows the distance of the current focal plane or image plane to the paraxial focal plane as a function of the field of view coordinates, and the meridional field curvature data is the distance from the currently determined focal plane to the paraxial focal plane measured along the Z axis and measured in the meridional (YZ plane). Sagittal curvature data measures distances measured in a plane perpendicular to the meridian plane, the baseline in the schematic is on the optical axis, the top of the curve represents the maximum field of view (angle or height), and no units are set on the longitudinal axis, since the curve is always normalized by the maximum radial field of view.
Referring to fig. 7, as shown in fig. 7, the distortion of the optical lens 10 provided by the present application is preferably controlled within-20%. Generally, lens distortion is a general term of intrinsic perspective distortion of an optical lens, that is, distortion caused by perspective, which is very unfavorable for the imaging quality of a photograph, and after all, the purpose of photography is to reproduce rather than exaggerate, but because the distortion is intrinsic characteristics of the lens (converging light rays of a convex lens and diverging light rays of a concave lens), the distortion cannot be eliminated, and only can be improved. The distortion of the fixed-focus lens provided by the embodiment is only-15.5%, the distortion is set to balance the focal length, the angle of view and the size of the target surface of the corresponding camera, and the deformation caused by the distortion can be corrected through post-image processing.
Referring to fig. 8, fig. 8 is a lateral fan diagram of a second embodiment of an optical lens according to the present application in the visible light band. As shown in fig. 8, the optical lens 10 provided by the present application has a more concentrated curve in the optical fan diagram, and also has excellent control of spherical aberration and dispersion.
Referring to fig. 9, fig. 9 is a schematic diagram of a transverse fan diagram of a second embodiment of an optical lens provided by the present application in a visible light band. As shown in fig. 9, the optical lens 10 provided by the present application has a small spot radius, is relatively concentrated, and has excellent corresponding aberration and coma.
Referring to fig. 10, fig. 10 is a schematic structural diagram of an embodiment of a laser radar according to the present disclosure.
As shown in fig. 10, the high-performance laser radar 20 according to the embodiment of the present application includes at least one high-definition optical lens 21. Specifically, the high-definition optical lens 21 may be the optical lens 10 described in fig. 1 to 9, and the detailed structure thereof is not described herein again.
The high-performance laser radar 20 of the embodiment of the present application may be applied to the field of high-precision environment detection, and may be installed on an autonomous vehicle, for example, to provide high-precision environment positioning information for the autonomous vehicle. In other embodiments, the high performance lidar 20 may also be applied to other devices, such as an unmanned aerial vehicle, a sweeping robot, and the like.
The above description is only for the purpose of illustrating embodiments of the present application and is not intended to limit the scope of the present application, which is defined by the claims and the accompanying drawings, and the equivalents and equivalent structures and equivalent processes used in the present application and the accompanying drawings are also directly or indirectly applicable to other related technical fields and are all included in the scope of the present application.

Claims (12)

1. A high-definition optical lens, comprising, in order from an object side to an image side along an optical axis: a first lens of negative optical power; a second lens of positive optical power; a third lens of negative optical power; a fourth lens of positive optical power; a fifth lens of negative power; a sixth lens of positive refractive power; a seventh lens of positive optical power; an eighth lens of positive refractive power; an optical filter; an imaging plane;
wherein a combined focal length of the third lens and the fourth lens
Figure 302211DEST_PATH_IMAGE001
Focal length of the optical lens
Figure 987270DEST_PATH_IMAGE002
Angle of view of the optical lens
Figure 964715DEST_PATH_IMAGE003
The following relation is satisfied:
Figure 520462DEST_PATH_IMAGE004
。
2. the optical lens of claim 1,
a combined focal length of the third lens and the fourth lens
Figure 853223DEST_PATH_IMAGE001
Focal length of the optical lens
Figure 87895DEST_PATH_IMAGE002
Angle of view of the optical lens
Figure 869032DEST_PATH_IMAGE003
The following relation is satisfied:
Figure 607181DEST_PATH_IMAGE005
。
3. an optical lens according to claim 1, characterized in that the optical lens further comprises an aperture stop disposed between the fourth lens and the fifth lens.
4. The optical lens of claim 1,
the second lens is a biconvex lens, and the image side surface of the second lens at the paraxial position is a convex surface;
the seventh lens is a meniscus lens; the object side surface of the seventh lens is concave at the paraxial region.
5. The optical lens according to claim 4,
the center curvature radius of the image side surface of the seventh lens element is R13, the center curvature radius of the object side surface of the eighth lens element is R14, and the following relation is satisfied:
Figure 48526DEST_PATH_IMAGE006
。
6. the optical lens according to claim 4,
the focal length of the second lens is
Figure 301653DEST_PATH_IMAGE007
The focal length of the seventh lens is
Figure 994802DEST_PATH_IMAGE008
And satisfies the following relation:
Figure 416819DEST_PATH_IMAGE009
Figure 170011DEST_PATH_IMAGE010
29。
7. an optical lens according to claim 1,
the optical back focus of the optical lens is BFL, the total system length of the optical lens is TTL, and the following relational expression is satisfied:
Figure 176013DEST_PATH_IMAGE011
。
8. an optical lens according to claim 1,
the glass material of the first lens has an Abbe number of
Figure 141695DEST_PATH_IMAGE012
The abbe number of the glass material of the third lens is
Figure 916753DEST_PATH_IMAGE013
The Abbe number of the fifth lens is
Figure 106426DEST_PATH_IMAGE014
And satisfies the following relation:
Figure 68566DEST_PATH_IMAGE015
Figure 729617DEST_PATH_IMAGE016
Figure 234547DEST_PATH_IMAGE017
。
9. an optical lens according to claim 1,
the fourth lens element is made of glass having a refractive index of
Figure 188597DEST_PATH_IMAGE018
The refractive index of the glass material of the sixth lens is
Figure 44557DEST_PATH_IMAGE019
The refractive index of the glass material of the eighth lens is
Figure 742255DEST_PATH_IMAGE020
And satisfies the following relation:
Figure 367271DEST_PATH_IMAGE021
Figure 757801DEST_PATH_IMAGE022
Figure 632217DEST_PATH_IMAGE023
。
10. an optical lens according to claim 1,
the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are glass spherical lenses;
the eighth lens is an aspheric lens.
11. An optical lens according to claim 1,
the first lens is a biconcave lens, the second lens is a biconvex lens, the third lens is a meniscus lens, the fourth lens is a meniscus lens, the fifth lens is a biconcave lens, the sixth lens is a biconvex lens, the seventh lens is a meniscus lens, and the eighth lens is a biconvex lens.
12. A high performance lidar characterized by comprising an optical lens of any one of claims 1 to 11.
CN202211167735.4A 2022-09-23 2022-09-23 High-definition optical lens and high-performance laser radar Active CN115248496B (en)

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Cited By (1)

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JP2005283709A (en) * 2004-03-29 2005-10-13 Nagano Kogaku Kenkyusho:Kk Compact zoom lens
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CN207232497U (en) * 2017-08-16 2018-04-13 深圳市德利欧科技有限公司 The projection arrangement of scanning-projection system
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002341242A (en) * 2001-05-21 2002-11-27 Matsushita Electric Ind Co Ltd Projection lens and projector using the same
JP2005283709A (en) * 2004-03-29 2005-10-13 Nagano Kogaku Kenkyusho:Kk Compact zoom lens
CN105700117A (en) * 2016-04-26 2016-06-22 中山联合光电科技股份有限公司 Optical imaging system
CN207232497U (en) * 2017-08-16 2018-04-13 深圳市德利欧科技有限公司 The projection arrangement of scanning-projection system
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115598804A (en) * 2022-11-30 2023-01-13 浙江大华技术股份有限公司（Cn） Optical lens and imaging device
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