CN115248496B - High-definition optical lens and high-performance laser radar - Google Patents
High-definition optical lens and high-performance laser radar Download PDFInfo
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- CN115248496B CN115248496B CN202211167735.4A CN202211167735A CN115248496B CN 115248496 B CN115248496 B CN 115248496B CN 202211167735 A CN202211167735 A CN 202211167735A CN 115248496 B CN115248496 B CN 115248496B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 191
- 238000003384 imaging method Methods 0.000 claims abstract description 24
- 239000011521 glass Substances 0.000 claims description 31
- 239000000463 material Substances 0.000 claims description 26
- 230000005499 meniscus Effects 0.000 claims description 11
- 238000010586 diagram Methods 0.000 description 15
- 230000004075 alteration Effects 0.000 description 7
- 238000012546 transfer Methods 0.000 description 6
- 239000006185 dispersion Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000035945 sensitivity Effects 0.000 description 4
- 238000012634 optical imaging Methods 0.000 description 3
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- 206010010071 Coma Diseases 0.000 description 2
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- G—PHYSICS
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
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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
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- 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
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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
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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 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 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
Focal length of optical lens
Angle of view of optical lens
The following relation is satisfied:
. The optical lens adopts 8 optical lenses with specific structures, 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
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
Due to the rapid development of automatic driving in recent years, vehicle-mounted optical lenses are increasingly applied in the field of automatic driving, in particular to 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 current optical imaging lenses: 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 technical problem, 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 having 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
Focal length of the optical lens
Angle of view of said optical lens
The following relation is satisfied:
wherein a combined focal length of the third lens and the fourth lens
Focal length of the optical lens
Angle of view of the optical lens
The following relation is satisfied:
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 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.
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:
wherein the focal length of the second lens is
The focal length of the seventh lens is
And satisfies the following relation:
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:
wherein the Abbe number of the glass material of the first lens is
The abbe number of the glass material of the third lens is
The Abbe number of the fifth lens is
And satisfies the following relation:
wherein the refractive index of the glass material of the fourth lens is
The refractive index of the glass material of the sixth lens is
The first mentionedThe refractive index of the glass material of the eight lenses is
And satisfies the following relation:
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 power; a second lens of positive optical power; a third lens having a negative refractive 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
Focal length of optical lens
Angle of view of optical lens
The following relation is satisfied:
. 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 required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other 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 stippling diagram of a first embodiment of an optical lens provided by the present application in the visible light 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 laser radar 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 in the claims of the present application and in the drawings described above, 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 following are specific:
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
The focal length of the optical lens 10 is
The angle of view of the optical lens 10 is
The above data satisfy the following relation:
。
in another embodiment provided herein, a combined focal length of the third lens and the fourth lens is defined
The focal length of the optical lens 10 is
The field angle of the optical lens 10 is
And satisfies the following relation:
。
specifically, in the following second specific embodiment, the above-described lens parameters of the optical lens 10 satisfy:
. In the following first specific embodiment, the above-described lens parameters of the optical lens 10 satisfy:
。
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-mentioned 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
Of the eighth lensThe center curvature radius of the object side surface is
And satisfies the following relation:
。
specifically, in the following first specific embodiment, the above-described lens parameters of the optical lens 10 satisfy:
. In the following second specific embodiment, the above-described lens parameters of the optical lens 10 satisfy:
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-mentioned lens parameter relation, which is not listed here. The second lens of the optical lens provided by the application has a focal length of
A focal length of the seventh lens is
And satisfies the following relation:
； 
。
specifically, in the following first specific embodiment, the above-described lens parameters of the optical lens 10 satisfy:
，
. In the following second specific embodiment, the above-described lens parameters of the optical lens 10 satisfy:
12，
。
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
The total system length of the optical lens 10 is
And satisfies the following relation:
。
specifically, in the following first specific embodiment, the above-described lens parameters of the optical lens 10 satisfy:
. In the following second specific embodiment, the above-described lens parameters of the optical lens 10 satisfy:
。
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
The third lens element L3 is made of glass having an Abbe number of
Abbe number of glass material of the fifth lens element L5
(ii) a Refractive index of glass material of fourth lens L4
The refractive index of the glass material of the sixth lens element L6 is
The refractive index of the glass material of the eighth lens element L8 is
。
The present application provides an optical lens 10 that satisfies the following relational expression:
； 
； 
； 
； 
； 
。
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 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.
The specific parameters are as follows:
TABLE 1 optical lens the first embodiment lens parameter Table
Specifically, in the present embodiment, the focal length of the optical lens 10 is defined as
Focal length of the cemented lens group G1 is
The field angle of the lens system is
Satisfy the following requirements
，Angle of view
=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=9.33Focal length of seventh lens L7f7=28.77. Through reasonable distribution of focal length, the shooting optical lens 10 has better imaging quality and lower sensitivity.
Defining the central curvature radius of the object-side surface of the seventh lens L7 as R13 and the central curvature radius of the image-side surface of the eighth lens L8 as R14, the following relations are satisfied:
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:
。
the total optical length is the distance from the incident light entering the lens to the sensor photosensitive surface, the optical back focal length is the distance from the light ray to the sensor photosensitive surface from the surface of the last lens of the lens, the total mechanical length of the lens is limited not to exceed 32mm through the ratio, and 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 large, and the monitoring requirement under the low illumination condition can be met.
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 coefficient can be defined by the following aspheric equation, but is not limited to the following expression:
wherein,Zis asphericZA sagittal 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 overlapped 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 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 field 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%. In general, lens distortion is actually a general term of perspective distortion inherent in an optical lens, that is, distortion due to perspective, and the distortion 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 inherent in a lens (converging light rays of a convex lens and diverging light rays of a concave lens), the distortion cannot be eliminated and can only 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 sector diagram, and the spherical aberration and dispersion are also well controlled.
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 thickness ofTcRefractive index of the glassNdAbbe 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
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 asfFocal length of the cemented lens group G1 is
The field angle of the lens system isFOVSatisfy the following requirements
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 image pickup 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:
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.
The optical back focus of the optical lens 10 in the present application is defined asBFLThe total system length of the optical lens 10 isTTLAnd the following relation is satisfied between the two:
. Wherein, the opticsThe total length is the distance from the lens entering to the sensor photosurface of the axis incident light, the optical back focal point is the distance from the surface of the last lens of the lens to the sensor photosurface, the ratio is used for limiting, the mechanical total length of the lens is not more than 32mm, and the miniaturization requirement is met.
Define the aperture of the optical lens 10 asFNOThe present embodiment provides an aperture of an optical lens 10FNO≤1.65，The aperture is large, and the monitoring requirement under the low light intensity condition can be met.
The size of an imaging plane 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 coefficient can be defined by the following aspheric equation, but is not limited to the following expression:
wherein,Zis asphericZA radial 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 coefficients of 4 th, 6 th, 8 th, 10 th, 12 th, 14 th and 16 th order of aspheric polynomial.
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 (half image height Y' =4.0 mm) is more than 0.3, 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 overlapped 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 field 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%. In general, lens distortion is actually a general term of perspective distortion inherent in an optical lens, that is, distortion due to perspective, and the distortion 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 inherent in a lens (converging light rays of a convex lens and diverging light rays of a concave lens), the distortion cannot be eliminated and can only 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 dot-column 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 lidar provided in the present application.
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 an embodiment of the present application, and is not intended to limit the scope of the present application, and the present application is also intended to cover the modifications and equivalents of the structure or equivalent process included in the description and drawings of the present application, or to be directly or indirectly applied to other related technical fields.
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 having a negative refractive power; a sixth lens having 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
Focal length of the optical lens
Angle of view of the optical lens
The following relation is satisfied:
2. the optical lens of claim 1,
a combined focal length of the third lens and the fourth lens
Focal length of the optical lens
Angle of view of the optical lens
The following relation is satisfied:
3. an optical lens according to claim 1, characterized in that the optical lens further comprises an aperture stop, which is arranged between the fourth lens and the fifth lens.
4. An optical lens according to claim 1,
the second lens is a biconvex lens, and the image side surface of the second lens is a convex surface at the paraxial part;
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:
6. the optical lens according to claim 4,
the focal length of the second lens is
The focal length of the seventh lens is
And satisfies the following relation:
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:
8. an optical lens according to claim 1,
the Abbe number of the glass material of the first lens is
The third lens has an Abbe number of a glass material
The Abbe number of the fifth lens is
And satisfies the following relation:
9. an optical lens according to claim 1,
the fourth lens element is made of glass having a refractive index of
The refractive index of the glass material of the sixth lens is
The refractive index of the glass material of the eighth lens is
And satisfies the following relation:
10. the optical lens of 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. The optical lens of 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 comprising the optical lens of any of claims 1 to 11.
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| CN202211167735.4A CN115248496B (en) | 2022-09-23 | 2022-09-23 | High-definition optical lens and high-performance laser radar |
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| CN202211167735.4A CN115248496B (en) | 2022-09-23 | 2022-09-23 | High-definition optical lens and high-performance laser radar |
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| CN115248496B true CN115248496B (en) | 2022-12-16 |
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| JP2002341242A (en) * | 2001-05-21 | 2002-11-27 | Matsushita Electric Ind Co Ltd | Projection lens and projector using it |
| JP2005283709A (en) * | 2004-03-29 | 2005-10-13 | Nagano Kogaku Kenkyusho:Kk | Small 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 |
| JP2019191502A (en) * | 2018-04-27 | 2019-10-31 | 株式会社タムロン | Inner-focus image capturing lens and image capturing device |
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Patent Citations (5)
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|---|---|---|---|---|
| JP2002341242A (en) * | 2001-05-21 | 2002-11-27 | Matsushita Electric Ind Co Ltd | Projection lens and projector using it |
| JP2005283709A (en) * | 2004-03-29 | 2005-10-13 | Nagano Kogaku Kenkyusho:Kk | Small 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 |
| JP2019191502A (en) * | 2018-04-27 | 2019-10-31 | 株式会社タムロン | Inner-focus image capturing lens and image capturing device |
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