CN116755217B - Optical lens and laser radar - Google Patents
Optical lens and laser radar Download PDFInfo
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- CN116755217B CN116755217B CN202311003425.3A CN202311003425A CN116755217B CN 116755217 B CN116755217 B CN 116755217B CN 202311003425 A CN202311003425 A CN 202311003425A CN 116755217 B CN116755217 B CN 116755217B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 59
- 239000000463 material Substances 0.000 claims abstract description 40
- 239000011521 glass Substances 0.000 claims description 35
- 230000007547 defect Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 10
- 238000003384 imaging method Methods 0.000 description 5
- 238000005286 illumination Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
- 238000007723 die pressing method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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- 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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Abstract
The application relates to an optical lens and a laser radar, which consists of a first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged from an object space to an image space; the fourth lens and the fifth lens form a double-cemented lens, and the other lenses are all single lenses. The application overcomes the defects of small angle of view, insufficient target surface, large distortion and the like existing in the long optical lens used in the laser radar at present, and has the advantages of large angle of view, large target surface and low distortion simultaneously by optimizing and limiting parameters such as focal power, concave-convex shape of each surface, air gap, curvature radius, half diameter, center thickness, material, refractive index, abbe coefficient and the like and limiting the first lens and the sixth lens to be aspheric lenses.
Description
Technical Field
The application relates to an optical lens and a laser radar, which are applied to the production field of laser radar lenses and laser radars.
Background
The application of the laser radar is that a detection signal is emitted to a target, reflected light is focused on the detector through a receiving lens set arranged in front of the laser radar detector, the reflected light is converted into a reflected signal, the reflected signal is compared with the emission signal and is properly processed, and then related information of the target such as parameters of the target such as distance, height and speed of the target can be obtained, so that the target is detected, tracked and identified. The optical lens used on the laser radar at present has the defects of smaller field angle, insufficient target surface, larger distortion and the like. For example, CN202211167735.4 discloses a high-definition optical lens and a high-performance laser radar, the angle of view is 77.3 °, the distortion is-19.3%, and the target surface is phi 8mm; the optical lens and the laser radar disclosed in CN202222121872.6 have the field distortion of-60% and the target surface of phi 7.55mm.
Therefore, it is urgent to provide an optical lens and a laser radar which have a large angle of view, a large target surface and low distortion.
Disclosure of Invention
In order to overcome the defects that the optical lens used in the laser radar at present is generally small in angle of view, insufficient in target surface, large in distortion and the like, the application provides the optical lens and the laser radar, and parameters such as focal power, concave-convex shapes of each surface, air gaps, curvature radius, half diameter, center thickness, materials, refractive indexes, abbe coefficients and the like are preferably limited, and the first lens and the sixth lens are matched and limited to be aspheric lenses, so that the optical lens and the laser radar have the advantages of large angle of view, large target surface and low distortion.
The technical scheme of the application is as follows:
an optical lens comprises a first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged from an object side to an image side; the fourth lens and the fifth lens form a double-cemented lens, and the other lenses are all single lenses;
the first lens is a negative focal power lens, the first surface of the first lens is a convex surface, the second surface is a concave surface,
the second lens is a positive focal power lens, the first surface of the second lens is a convex surface, the second surface is a concave surface,
the third lens is a negative focal power lens, the first surface of the third lens is a convex surface, the second surface is a concave surface,
the fourth lens is a negative focal power lens, the first surface of the fourth lens is a convex surface, the second surface is a concave surface,
the fifth lens is a positive focal power lens, the first surface of the fifth lens is a convex surface, the second surface is a convex surface,
the sixth lens is a positive focal power lens, the first surface of the sixth lens is a convex surface, and the second surface of the sixth lens is a convex surface;
the air gap between the first lens and the second lens is 0.891-4.898 mm,
the air gap between the second lens and the third lens is 0.1-0.231 mm,
the air gap between the third lens and the diaphragm is 3.17-4.381 mm,
the air gap between the diaphragm and the fourth lens is 1.141-1.659 mm,
the air gap between the fifth lens and the sixth lens is 4.369-5.687 mm;
the first surface of the first lens has a curvature radius of 37.373-40.004 mm, the second surface has a curvature radius of 10.339-11.195 mm,
the radius of curvature of the first surface of the second lens is 11.725-15.743 mm, the radius of curvature of the second surface is 31.455-58.73 mm,
the curvature radius of the first surface of the third lens is 10.825-19.682 mm, the curvature radius of the second surface is 3.709-3.95 mm,
the curvature radius of the first surface of the fourth lens is 28.137-48.907 mm, the curvature radius of the second surface is 12.586-12.794 mm,
the curvature radius of the first surface of the fifth lens is 12.568-12.794 mm, the curvature radius of the second surface is-7.116-8.235 mm,
the curvature radius of the first surface of the sixth lens is 30.325-31.654 mm, and the curvature radius of the second surface is-19.185-21.740 mm;
the half diameter of the first surface of the first lens is 10.505-17.04 mm, the half diameter of the second surface is 7.540-9.453 mm,
the half diameter of the first surface of the second lens is 7.354-9.188 mm, the half diameter of the second surface is 8mm,
the half diameter of the first surface of the third lens is 5.030-5.432 mm, the half diameter of the second surface is 3.044-3.4 mm,
the first surface half diameter of the fourth lens is 4.9mm, the second surface half diameter is 6.8mm,
the half diameter of the first surface of the fifth lens is 6.8mm, the half diameter of the second surface is 6.822-7.111 mm,
the half diameter of the first surface of the sixth lens is 8.398-9.225 mm, and the half diameter of the second surface is 8.257-9.070 mm;
the center thickness of the first lens is 1.652-2.103 mm,
the center thickness of the second lens is 2.312-4.22 mm,
the center thickness of the third lens is 1-1.634 mm,
the center thickness of the fourth lens is 1-1.794 mm,
the center thickness of the fifth lens is 4.787-7.8 mm,
the center thickness of the sixth lens is 4.114-4.5 mm;
the first lens and the sixth lens are aspheric lenses.
The optical lens has the advantages of large angle of view, large target surface and low distortion by optimizing and limiting parameters such as focal power, concave-convex shape of each surface, air gap, curvature radius, half diameter, center thickness, material, refractive index, abbe coefficient and the like and matching and limiting the first lens and the sixth lens to be aspherical lenses. The focal length of the optical lens is 6.28mm plus or minus 10% mm, the maximum field angle FOV can reach 105 degrees of large-angle field information, a large target surface of 1 inch (the corresponding image surface size is phi 16 mm), the F number of the F is 2.0 plus or minus 5%, the half image height can reach 8.1mm, and a double-sheet die pressing aspheric lens is adopted in the optical system, so that the system realizes ultra-low optical distortion with the absolute value of < |1.2|% under 40mm short TTL, the overall size of the lens is greatly shortened, and a high-precision cloud picture is obtained. The optical lens is arranged in front of the detector when in use.
The first lens is made of glass material: 1.55< n <1.75, 45< Vd <55,
the second lens is made of glass material: 1.80< n <2.10, 15< Vd <25,
the third lens is made of glass material: 1.55< n <1.75, 55< Vd <65,
the fourth lens is made of glass material: 1.80< n <2.10, 15< Vd <25,
the fifth lens is made of glass material: 1.55< n <1.75, 60< Vd <70,
the sixth lens is made of glass material: 1.70< n <1.95, 35< Vd <45,
where n is the refractive index and Vd is the Abbe's number.
The optical lens is arranged in front of the detector, a plane lens is arranged on the detector, the plane lens is positioned between the detector and the sixth lens, and the air gap between the sixth lens and the plane lens is 1-3 mm.
The plane lens is a protective lens and can play a role in protecting the detector.
The planar lens is made of glass materials: 1.50< n <1.70, 55< Vd <65, where n is the refractive index and Vd is the Abbe's coefficient.
The preferable plane lens material, refractive index and Abbe coefficient can further ensure the large angle, large target surface and low distortion imaging of the optical lens.
A laser radar comprises the optical lens.
The laser radar with the specially designed optical lens has the advantages of large angle, large target surface and low distortion imaging. The laser radar can receive laser reflection light points with the wavelengths of 0.850um-0.950um returned from a target and construct 4D point cloud imaging, so that surrounding environment information is obtained.
Compared with the prior art, the application has the following advantages:
1) The optical lens has the advantages of large angle of view, large target surface and low distortion by optimizing and limiting parameters such as focal power, concave-convex shape of each surface, air gap, curvature radius, half diameter, center thickness, material, refractive index, abbe coefficient and the like, and matching and limiting the first lens and the sixth lens to be aspheric lenses;
2) The laser radar provided by the application has the advantages of large angle, large target surface and low distortion imaging, can receive laser reflection light spots with the wavelengths of 0.850-0.950 um returned from a target, and constructs a 4D point cloud imaging, so that surrounding environment information is obtained.
Drawings
FIG. 1 is a diagram of an optical lens and lidar optical system according to the present application;
FIG. 2 is an MTF diagram of an optical lens and lidar embodiment 1 according to the present application;
FIG. 3 is a point diagram of an optical lens and lidar embodiment 1 according to the present application;
FIG. 4 is a graph showing curvature of field/distortion of an optical lens and lidar embodiment 1 according to the present application;
FIG. 5 is a diagram of illumination of an optical lens and lidar embodiment 1 according to the present application;
FIG. 6 is an MTF diagram of an optical lens and lidar embodiment 2 according to the present application;
FIG. 7 is a dot column diagram of an optical lens and lidar embodiment 2 according to the present application;
FIG. 8 is a graph showing curvature of field/distortion of an optical lens and lidar embodiment 2 according to the present application;
FIG. 9 is a diagram of illumination of an optical lens and lidar embodiment 2 according to the present application;
FIG. 10 is an MTF diagram of an optical lens and lidar embodiment 3 according to the present application;
FIG. 11 is a dot column diagram of an optical lens and lidar embodiment 3 according to the present application;
FIG. 12 is a graph showing curvature of field/distortion of an optical lens and lidar embodiment 3 according to the present application;
fig. 13 is an illuminance diagram of an optical lens and lidar example 3 according to the present application.
Description of the reference numerals:
1. the lens comprises a first lens, 2, a second lens, 3, a third lens, 4, a fourth lens, 5, a fifth lens, 6, a sixth lens, 7, a plane lens, 8, a diaphragm, 9 and a detector.
Detailed Description
The technical scheme of the application is described in detail below with reference to the accompanying drawings 1-13.
Example 1 (focal length 6.28 mm)
As shown in fig. 1 to 5, an optical lens of the present application is composed of a first lens 1, a second lens 2, a third lens 3, a diaphragm 8, a fourth lens 4, a fifth lens 5 and a sixth lens 6, which are sequentially arranged from an object side to an image side; the fourth lens 4 and the fifth lens 5 form a double-cemented lens, and the other lenses are all single lenses;
the first lens 1 is a negative power lens, the first surface of the first lens 1 is a convex surface, the second surface is a concave surface,
the second lens 2 is a positive power lens, the first surface of the second lens 2 is a convex surface, the second surface is a concave surface,
the third lens 3 is a negative power lens, the first surface of the third lens 3 is a convex surface, the second surface is a concave surface,
the fourth lens 4 is a negative power lens, the first surface of the fourth lens 4 is a convex surface, the second surface is a concave surface,
the fifth lens 5 is a positive power lens, the first surface of the fifth lens 5 is convex, the second surface is convex,
the sixth lens 6 is a positive power lens, the first surface of the sixth lens 6 is a convex surface, and the second surface is a convex surface;
the air gap between the first lens 1 and the second lens 2 is 2.873mm,
the air gap between the second lens 2 and the third lens 3 is 0.231mm,
the air gap between the third lens 3 and the diaphragm 8 is 3.17mm,
the air gap between the diaphragm 8 and the fourth lens 4 is 1.468mm,
the air gap between the fifth lens 5 and the sixth lens 6 is 4.369mm;
the first lens 1 has a first surface radius of curvature of 37.84mm, a second surface radius of curvature of 10.6mm,
the radius of curvature of the first surface of the second lens 2 is 15.52mm, the radius of curvature of the second surface is 58.73mm,
the radius of curvature of the first surface of the third lens 3 is 11.51mm, the radius of curvature of the second surface is 3.95mm,
the radius of curvature of the first surface of the fourth lens 4 is 39.3mm, the radius of curvature of the second surface is 12.645mm,
the first surface of the fifth lens 5 has a radius of curvature of 12.645mm, the second surface has a radius of curvature of-8.235 mm,
the radius of curvature of the first surface of the sixth lens 6 is 31.41mm, and the radius of curvature of the second surface is-21.22 mm;
the first lens 1 has a first surface half diameter of 17.04mm, a second surface half diameter of 9.289mm,
the second lens 2 has a first surface half diameter of 9.188mm, a second surface half diameter of 8mm,
the third lens 3 has a first surface half diameter of 5.432mm, a second surface half diameter of 3.4mm,
the first surface half diameter of the fourth lens 4 is 4.9mm, the second surface half diameter is 6.8mm,
the fifth lens 5 has a first surface half diameter of 6.8mm, a second surface half diameter of 6.926mm,
the half diameter of the first surface of the sixth lens 6 is 8.846mm, and the half diameter of the second surface is 8.846mm;
the center thickness of the first lens 1 is 2mm,
the center thickness of the second lens 2 is 4.22mm,
the center thickness of the third lens 3 is 1mm,
the center thickness of the fourth lens 4 is 1mm,
the center thickness of the fifth lens 5 is 7.8mm,
the center thickness of the sixth lens 6 is 4.5mm;
the first lens 1 is a glass material: 1.55< n <1.75, 45< Vd <55,
the second lens 2 is a glass material: 1.80< n <2.10, 15< Vd <25,
the third lens 3 is a glass material: 1.55< n <1.75, 55< Vd <65,
the fourth lens 4 is a glass material: 1.80< n <2.10, 15< Vd <25,
the fifth lens 5 is a glass material: 1.55< n <1.75, 60< Vd <70,
the sixth lens 6 is a glass material: 1.70< n <1.95, 35< Vd <45,
wherein n is refractive index, vd is Abbe coefficient;
the first lens 1 and the sixth lens 6 are both aspherical lenses.
Wherein, each aspheric surface accords with the following even aspheric surface formula:
in the formula, r is the caliber vertical to the optical axis direction, z is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height r along the optical axis direction, c represents the vertex curvature (namely the inverse of the curvature radius) of the surface, k is a conical coefficient, a is a higher-order aspheric coefficient, the value of the conical coefficient refers to an aspheric coefficient table, i is the aspheric order, and a i Is the coefficient of each higher order term, and 2i is the higher order of the aspherical surface.
Conic coefficient of the first surface of the first lens: 1.383,
conic coefficient of the second surface of the first lens: -0.696,
conic coefficient of the first surface of the sixth lens: 10.127,
conic coefficient of the second surface of the sixth lens: -63.155.
The aspherical coefficients were as follows:
table 1 aspherical coefficients
| Surface of the body | α4 | α6 | α8 | α10 | α12 | α14 |
| First surface of first lens | 1.362E-004 | 7.855E-007 | -2.741E-008 | 2.406E-0010 | -1.050E-012 | 1.860E-015 |
| A first lens second surface | 6.598E-005 | 1.296E-005 | -3.256E-007 | 4.668E-009 | -4.201E-011 | 1.582E-013 |
| A first surface of a sixth lens | 6.986E-007 | -5.628E-007 | 6.300E-008 | -1.458E-009 | 1.482E-011 | -7.856E-014 |
| Second surface of sixth lens | -4.580E-004 | 2.231E-005 | -5.471E-007 | 9.406E-009 | -9.154E-011 | 3.490E-013 |
The optical lens is arranged in front of the detector 9, the detector 9 is provided with a plane lens 7, the plane lens 7 is positioned between the detector 9 and the sixth lens 6, and the air gap between the sixth lens 6 and the plane lens 7 is 1mm.
The planar lens 7 is made of glass material: 1.50< n <1.70, 55< Vd <65, where n is the refractive index and Vd is the Abbe's coefficient.
A laser radar comprises the optical lens.
Example 2 (focal length 7 mm)
As shown in fig. 1 and 6-9, the optical lens of the present application comprises a first lens 1, a second lens 2, a third lens 3, a diaphragm 8, a fourth lens 4, a fifth lens 5 and a sixth lens 6, which are sequentially arranged from an object side to an image side; the fourth lens 4 and the fifth lens 5 form a double-cemented lens, and the other lenses are all single lenses;
the first lens 1 is a negative power lens, the first surface of the first lens 1 is a convex surface, the second surface is a concave surface,
the second lens 2 is a positive power lens, the first surface of the second lens 2 is a convex surface, the second surface is a concave surface,
the third lens 3 is a negative power lens, the first surface of the third lens 3 is a convex surface, the second surface is a concave surface,
the fourth lens 4 is a negative power lens, the first surface of the fourth lens 4 is a convex surface, the second surface is a concave surface,
the fifth lens 5 is a positive power lens, the first surface of the fifth lens 5 is convex, the second surface is convex,
the sixth lens 6 is a positive power lens, the first surface of the sixth lens 6 is a convex surface, and the second surface is a convex surface;
the air gap between the first lens 1 and the second lens 2 is 0.891mm,
the air gap between the second lens 2 and the third lens 3 is 0.117mm,
the air gap between the third lens 3 and the diaphragm 8 is 4.381mm,
the air gap between the diaphragm 8 and the fourth lens 4 is 1.141mm,
the air gap between the fifth lens 5 and the sixth lens 6 is 5.687mm;
the first lens 1 has a first surface radius of curvature of 40.004mm, a second surface radius of curvature of 11.195mm,
the radius of curvature of the first surface of the second lens 2 is 11.725mm, the radius of curvature of the second surface is 31.455mm,
the radius of curvature of the first surface of the third lens 3 is 19.682mm, the radius of curvature of the second surface is 3.896mm,
the fourth lens 4 has a first surface radius of curvature of 28.137mm, a second surface radius of curvature of 12.794mm,
the first surface of the fifth lens 5 has a radius of curvature of 12.794mm, the second surface has a radius of curvature of-8.194 mm,
the radius of curvature of the first surface of the sixth lens 6 is 31.654mm, and the radius of curvature of the second surface is-21.740 mm;
the first lens 1 has a first surface half diameter of 10.505mm, a second surface half diameter of 7.540mm,
the second lens 2 has a first surface half diameter of 7.354mm, a second surface half diameter of 8mm,
the third lens 3 has a first surface half diameter of 5.030mm, a second surface half diameter of 3.044mm,
the first surface half diameter of the fourth lens 4 is 4.9mm, the second surface half diameter is 6.8mm,
the fifth lens 5 has a first surface half diameter of 6.8mm, a second surface half diameter of 7.111mm,
the half diameter of the first surface of the sixth lens 6 is 9.225mm, and the half diameter of the second surface is 9.070mm;
the first lens 1 has a central thickness of 1.652mm,
the center thickness of the second lens 2 is 2.312mm,
the center thickness of the third lens 3 is 1.634mm,
the center thickness of the fourth lens 4 is 1.505mm,
the center thickness of the fifth lens 5 is 4.787mm,
the center thickness of the sixth lens 6 is 4.114mm;
the first lens 1 is a glass material: 1.55< n <1.75, 45< Vd <55,
the second lens 2 is a glass material: 1.80< n <2.10, 15< Vd <25,
the third lens 3 is a glass material: 1.55< n <1.75, 55< Vd <65,
the fourth lens 4 is a glass material: 1.80< n <2.10, 15< Vd <25,
the fifth lens 5 is a glass material: 1.55< n <1.75, 60< Vd <70,
the sixth lens 6 is a glass material: 1.70< n <1.95, 35< Vd <45,
wherein n is refractive index, vd is Abbe coefficient;
the first lens 1 and the sixth lens 6 are both aspherical lenses.
Wherein, each aspheric surface accords with the following even aspheric surface formula:
in the formula, r is the caliber vertical to the optical axis direction, z is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height r along the optical axis direction, c represents the vertex curvature (namely the inverse of the curvature radius) of the surface, k is a conical coefficient, a is a higher-order aspheric coefficient, the value of the conical coefficient refers to an aspheric coefficient table, i is the aspheric order, and a i Is the coefficient of each higher order term, and 2i is the higher order of the aspherical surface.
Conic coefficient of the first surface of the first lens: 1.383
Conic coefficient of the second surface of the first lens: -0.696
Conic coefficient of the first surface of the sixth lens: 10.127
Conic coefficient of the second surface of the sixth lens: -63.155
The aspherical coefficients were as follows:
table 2 aspherical coefficients
| Surface of the body | α4 | α6 | α8 | α10 | α12 | α14 |
| First surface of first lens | 1.362E-004 | 7.855E-007 | -2.741E-008 | 2.406E-0010 | -1.050E-012 | 1.860E-015 |
| A first lens second surface | 6.598E-005 | 1.296E-005 | -3.256E-007 | 4.668E-009 | -4.201E-011 | 1.582E-013 |
| A first surface of a sixth lens | 6.986E-007 | -5.628E-007 | 6.300E-008 | -1.458E-009 | 1.482E-011 | -7.856E-014 |
| Second surface of sixth lens | -4.580E-004 | 2.231E-005 | -5.471E-007 | 9.406E-009 | -9.154E-011 | 3.490E-013 |
The optical lens is arranged in front of the detector 9, the detector 9 is provided with a plane lens 7, the plane lens 7 is positioned between the detector 9 and the sixth lens 6, and the air gap between the sixth lens 6 and the plane lens 7 is 2mm.
The planar lens 7 is made of glass material: 1.50< n <1.70, 55< Vd <65, where n is the refractive index and Vd is the Abbe's coefficient.
A laser radar comprises the optical lens.
Example 3 (focal length 5.65 mm)
As shown in fig. 1 and 10-13, an optical lens of the present application is composed of a first lens 1, a second lens 2, a third lens 3, a diaphragm 8, a fourth lens 4, a fifth lens 5 and a sixth lens 6, which are sequentially arranged from an object side to an image side; the fourth lens 4 and the fifth lens 5 form a double-cemented lens, and the other lenses are all single lenses;
the first lens 1 is a negative power lens, the first surface of the first lens 1 is a convex surface, the second surface is a concave surface,
the second lens 2 is a positive power lens, the first surface of the second lens 2 is a convex surface, the second surface is a concave surface,
the third lens 3 is a negative power lens, the first surface of the third lens 3 is a convex surface, the second surface is a concave surface,
the fourth lens 4 is a negative power lens, the first surface of the fourth lens 4 is a convex surface, the second surface is a concave surface,
the fifth lens 5 is a positive power lens, the first surface of the fifth lens 5 is convex, the second surface is convex,
the sixth lens 6 is a positive power lens, the first surface of the sixth lens 6 is a convex surface, and the second surface is a convex surface;
the air gap between the first lens 1 and the second lens 2 is 4.898mm,
the air gap between the second lens 2 and the third lens 3 is 0.1mm,
the air gap between the third lens 3 and the diaphragm 8 is 4.052mm,
the air gap between the diaphragm 8 and the fourth lens 4 is 1.659mm,
the air gap between the fifth lens 5 and the sixth lens 6 is 4.81mm;
the first lens 1 has a first surface radius of curvature of 37.373mm, a second surface radius of curvature of 10.339mm,
the second lens 2 has a first surface with a radius of curvature of 15.743mm, a second surface with a radius of curvature of 54.234mm,
the third lens 3 has a first surface radius of curvature of 10.825mm, a second surface radius of curvature of 3.709mm,
the fourth lens 4 has a first surface radius of curvature of 48.907mm, a second surface radius of curvature of 12.586mm,
the first surface of the fifth lens 5 has a radius of curvature of 12.586mm, the second surface has a radius of curvature of-7.116 mm,
the radius of curvature of the first surface of the sixth lens 6 is 30.325mm, and the radius of curvature of the second surface is-19.185 mm;
the first lens 1 has a first surface half diameter of 12.974mm, a second surface half diameter of 9.453mm,
the second lens 2 has a first surface half diameter of 8.704mm, a second surface half diameter of 8mm,
the third lens 3 has a first surface half diameter of 5.274mm, a second surface half diameter of 3.329mm,
the first surface half diameter of the fourth lens 4 is 4.9mm, the second surface half diameter is 6.8mm,
the fifth lens 5 has a first surface half diameter of 6.8mm, a second surface half diameter of 6.822mm,
the half diameter of the first surface of the sixth lens 6 is 8.398mm, and the half diameter of the second surface is 8.257mm;
the center thickness of the first lens 1 is 2.103mm,
the center thickness of the second lens 2 is 3.344mm,
the center thickness of the third lens 3 is 1.088mm,
the center thickness of the fourth lens 4 is 1.794mm,
the center thickness of the fifth lens 5 is 5mm,
the center thickness of the sixth lens 6 is 4.381mm;
the first lens 1 is a glass material: 1.55< n <1.75, 45< Vd <55,
the second lens 2 is a glass material: 1.80< n <2.10, 15< Vd <25,
the third lens 3 is a glass material: 1.55< n <1.75, 55< Vd <65,
the fourth lens 4 is a glass material: 1.80< n <2.10, 15< Vd <25,
the fifth lens 5 is a glass material: 1.55< n <1.75, 60< Vd <70,
the sixth lens 6 is a glass material: 1.70< n <1.95, 35< Vd <45,
wherein n is refractive index, vd is Abbe coefficient;
the first lens 1 and the sixth lens 6 are both aspherical lenses.
Wherein, each aspheric surface accords with the following even aspheric surface formula:
in the formula, r is the caliber vertical to the optical axis direction, and z is the aspheric surface along the lightWhen the axial direction is at the position with the height r, the distance from the aspheric surface vertex is sagittal, c represents the vertex curvature (namely the inverse of the curvature radius) of the surface, k is a conical coefficient, alpha is a higher-order aspheric coefficient, the value refers to the aspheric coefficient table, i is the aspheric order, and alpha i Is the coefficient of each higher order term, and 2i is the higher order of the aspherical surface.
Conic coefficient of the first surface of the first lens: 1.383
Conic coefficient of the second surface of the first lens: -0.696
Conic coefficient of the first surface of the sixth lens: 10.127
Conic coefficient of the second surface of the sixth lens: -63.155
The aspherical coefficients were as follows:
table 3 aspherical coefficients
| Surface of the body | α4 | α6 | α8 | α10 | α12 | α14 |
| First surface of first lens | 1.362E-004 | 7.855E-007 | -2.741E-008 | 2.406E-0010 | -1.050E-012 | 1.860E-015 |
| A first lens second surface | 6.598E-005 | 1.296E-005 | -3.256E-007 | 4.668E-009 | -4.201E-011 | 1.582E-013 |
| A first surface of a sixth lens | 6.986E-007 | -5.628E-007 | 6.300E-008 | -1.458E-009 | 1.482E-011 | -7.856E-014 |
| Second surface of sixth lens | -4.580E-004 | 2.231E-005 | -5.471E-007 | 9.406E-009 | -9.154E-011 | 3.490E-013 |
The optical lens is arranged in front of the detector 9, the detector 9 is provided with a plane lens 7, the plane lens 7 is positioned between the detector 9 and the sixth lens 6, and the air gap between the sixth lens 6 and the plane lens 7 is 3mm.
The planar lens 7 is made of glass material: 1.50< n <1.70, 55< Vd <65, where n is the refractive index and Vd is the Abbe's coefficient.
A laser radar comprises the optical lens.
1-13 of the accompanying drawings, the full field MTF of the embodiment 1 satisfies 30lp/mm >0.49, RMS radius <10.819um, distortion < |1.2|%, and relative illuminance >47%; the full field MTF of example 2 satisfies 30lp/mm >0.5, RMS radius <7.843um, distortion < |1.2|%, relative illuminance >53%; the full field MTF of example 3 satisfies 30lp/mm >0.5, RMS radius <11.356um, distortion < |1.2|%, relative illuminance >72%. The optical lens has the advantages of large angle, large target surface and low distortion.
The optical lens and the laser radar according to the present application are not limited to the above embodiments, but any modifications or substitutions according to the principles of the present application should be made within the scope of the present application.
Claims (5)
1. An optical lens, characterized in that: the lens comprises a first lens (1), a second lens (2), a third lens (3), a diaphragm (8), a fourth lens (4), a fifth lens (5) and a sixth lens (6) which are sequentially arranged from an object side to an image side; wherein the fourth lens (4) and the fifth lens (5) form a double-cemented lens, and the other lenses are all single lenses;
the first lens (1) is a negative focal power lens, the first surface of the first lens (1) is a convex surface, the second surface is a concave surface,
the second lens (2) is a positive focal power lens, the first surface of the second lens (2) is a convex surface, the second surface is a concave surface,
the third lens (3) is a negative focal power lens, the first surface of the third lens (3) is a convex surface, the second surface is a concave surface,
the fourth lens (4) is a negative focal power lens, the first surface of the fourth lens (4) is a convex surface, the second surface is a concave surface,
the fifth lens (5) is a positive focal power lens, the first surface of the fifth lens (5) is a convex surface, the second surface is a convex surface,
the sixth lens (6) is a positive focal power lens, the first surface of the sixth lens (6) is a convex surface, and the second surface is a convex surface;
the air gap between the first lens (1) and the second lens (2) is 0.891-4.898 mm,
the air gap between the second lens (2) and the third lens (3) is 0.1-0.231 mm,
the air gap between the third lens (3) and the diaphragm (8) is 3.17-4.381 mm,
the air gap between the diaphragm (8) and the fourth lens (4) is 1.141-1.659 mm,
the air gap between the fifth lens (5) and the sixth lens (6) is 4.369-5.687 mm;
the first surface of the first lens (1) has a curvature radius of 37.373-40.004 mm and the second surface has a curvature radius of 10.339-11.195 mm,
the curvature radius of the first surface of the second lens (2) is 11.725-15.743 mm, the curvature radius of the second surface is 31.455-58.73 mm,
the radius of curvature of the first surface of the third lens (3) is 10.825-19.682 mm, the radius of curvature of the second surface is 3.709-3.95 mm,
the curvature radius of the first surface of the fourth lens (4) is 28.137-48.907 mm, the curvature radius of the second surface is 12.586-12.794 mm,
the curvature radius of the first surface of the fifth lens (5) is 12.586-12.794 mm, the curvature radius of the second surface is-7.116-8.235 mm,
the curvature radius of the first surface of the sixth lens (6) is 30.325-31.654 mm, and the curvature radius of the second surface is-19.185-21.740 mm;
the half diameter of the first surface of the first lens is 10.505-17.04 mm, the half diameter of the second surface is 7.540-9.453 mm,
the half diameter of the first surface of the second lens is 7.354-9.188 mm, the half diameter of the second surface is 8mm,
the half diameter of the first surface of the third lens is 5.030-5.432 mm, the half diameter of the second surface is 3.044-3.4 mm,
the first surface half diameter of the fourth lens is 4.9mm, the second surface half diameter is 6.8mm,
the half diameter of the first surface of the fifth lens is 6.8mm, the half diameter of the second surface is 6.822-7.111 mm,
the half diameter of the first surface of the sixth lens is 8.398-9.225 mm, and the half diameter of the second surface is 8.257-9.070 mm;
the center thickness of the first lens (1) is 1.652-2.103 mm,
the center thickness of the second lens (2) is 2.312-4.22 mm,
the center thickness of the third lens (3) is 1-1.634 mm,
the center thickness of the fourth lens (4) is 1-1.794 mm,
the center thickness of the fifth lens (5) is 4.787-7.8 mm,
the center thickness of the sixth lens (6) is 4.114-4.5 mm;
the first lens (1) and the sixth lens (6) are both aspherical lenses.
2. The optical lens of claim 1, wherein:
the first lens (1) is made of a glass material: 1.55< n <1.75, 45< Vd <55,
the second lens (2) is made of glass material: 1.80< n <2.10, 15< Vd <25,
the third lens (3) is made of glass material: 1.55< n <1.75, 55< Vd <65,
the fourth lens (4) is made of glass material: 1.80< n <2.10, 15< Vd <25,
the fifth lens (5) is made of glass material: 1.55< n <1.75, 60< Vd <70,
the sixth lens (6) is made of glass material: 1.70< n <1.95, 35< Vd <45,
where n is the refractive index and Vd is the Abbe's number.
3. The optical lens of claim 1, wherein: the optical lens is arranged in front of the detector (9), the detector (9) is provided with a plane lens (7), the plane lens (7) is positioned between the detector (9) and the sixth lens (6), and the air gap between the sixth lens (6) and the plane lens (7) is 1-3 mm.
4. An optical lens as claimed in claim 3, wherein: the planar lens (7) is made of glass material: 1.50< n <1.70, 55< Vd <65, where n is the refractive index and Vd is the Abbe's coefficient.
5. A lidar, characterized in that: comprising an optical lens as claimed in any one of claims 1 to 4.
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| JP2002006219A (en) * | 2000-06-23 | 2002-01-09 | Asahi Optical Co Ltd | Zoom lens system and focusing method therefor |
| CN102109660A (en) * | 2009-12-25 | 2011-06-29 | 佛山普立华科技有限公司 | Image-capturing lens |
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| CN110858024A (en) * | 2018-08-22 | 2020-03-03 | 宁波舜宇车载光学技术有限公司 | Optical lens |
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| JP2002006219A (en) * | 2000-06-23 | 2002-01-09 | Asahi Optical Co Ltd | Zoom lens system and focusing method therefor |
| CN102109660A (en) * | 2009-12-25 | 2011-06-29 | 佛山普立华科技有限公司 | Image-capturing lens |
| CN103576290A (en) * | 2013-10-30 | 2014-02-12 | 宁波舜宇车载光学技术有限公司 | Wide-angle lens |
| CN105044885A (en) * | 2015-06-23 | 2015-11-11 | 信华精机有限公司 | Optical imaging system for vehicle monitoring |
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