CN111308635A - 3d radar lens - Google Patents

Abstract

The invention relates to a 3D radar lens. It includes a main lens barrel, a front lens group, a diaphragm, a rear lens group, and a photosensitive chip arranged at the rear end of the main lens barrel, which are sequentially arranged in the main lens barrel along the light incident direction. The optical power of the front lens group is 8-20mm The focal power of the rear mirror group is 8.5-15mm; the front mirror group includes a first lens, a second lens and a third lens arranged in sequence along the light incident direction, and the rear mirror group includes a fourth lens arranged in sequence along the light incident direction , the fifth lens, the sixth lens and the seventh lens; the first lens is a double concave lens, the second lens is a double convex lens, the third lens is a double convex lens, the fourth lens is a double concave lens, and the fifth lens It is a biconvex lens, the sixth lens is a biconvex lens, and the seventh lens is a meniscus lens. The invention provides a 3D radar lens with an aperture of 0.8, which has a strong ability to receive light and can effectively improve the ranging distance of the laser radar.

Description

3d radar lens

technical field

The invention relates to the field of lenses, in particular to a 3D radar lens.

Background technique

Lidar ranging technology obtains three-dimensional information of the scene through laser scanning. The basic principle is to emit laser light into space at a certain time interval, and record the signal of each scanning point, through the interval from the lidar to the object in the measured scene, and then through the reflection of the object back to the lidar, it is calculated accordingly. The distance between the surface of the object and the lidar. Due to its wide ranging range and high measurement accuracy, lidar is widely used in artificial intelligence systems for outdoor 3D space perception, such as obstacle avoidance navigation for autonomous vehicles, 3D scene reconstruction and other applications.

3d lidar lenses are used to receive light signals. The larger the aperture, the better the reception performance. The existing 3d lidar lenses on the market usually have an aperture of 1.2 or higher. For more and more complex road conditions, a lens with an aperture of 1.2 appears. It is already a top priority to develop a lens with a large aperture.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a 3D radar lens with an aperture of 0.8, the lens has a strong ability to receive light, and can effectively improve the ranging distance of the laser radar.

The present invention is realized by the following technical solutions: a 3D radar lens, which is characterized in that: it comprises a main lens barrel, a front lens group, a diaphragm, a rear lens group, which are sequentially arranged in the main lens barrel along the light incident direction, and a The photosensitive chip at the rear end of the lens barrel, the focal power of the front lens group is 8-20mm, and the focal power of the rear lens group is 8.5-15mm;

The front mirror group includes a first lens, a second lens and a third lens arranged in sequence along the light incident direction, and the rear mirror group includes a fourth lens, a fifth lens, a sixth lens and a fourth lens arranged in sequence along the light incident direction. the seventh lens;

The first lens is a double-concave lens, the second lens is a double-convex lens, the third lens is a double-convex lens, the fourth lens is a double-concave lens, the fifth lens is a double-convex lens, and the sixth lens is a double-convex lens. A convex lens, the seventh lens is a meniscus lens, the air gap between the first lens and the second lens is 2-2.5mm, and the air gap between the second lens and the third lens is 0.05-0.25 mm, the rear surface of the third lens is the diaphragm surface, the air gap between the third lens and the fourth lens is 2-3.5mm, the fourth lens and the fifth lens form a close-contact cemented group, and the fifth lens The air gap interval between the sixth lens and the sixth lens is 0.05-0.25mm, and the air-gap interval between the sixth lens and the seventh lens is 0.05-0.25mm;

Each of the described lenses satisfies the following optical conditions:

1R1 is -10～-50mm, 1R2 is 10～30mm, d1 is 0.6～1mm, N1 is 1.8～1.95, v1 is 35～50;

2R1 is 15～35mm, 2R2 is -10～-20mm, d2 is 2.5～4mm, N2 is 1.95～2.07, v2 is 25～32;

3R1 is 14.5～35mm, 3R2 is -100～-150mm, d3 is 2～2.5mm, N3 is 1.72～1.85, v3 is 22～30;

4R1 is -7～-12mm, 4R2 is 10～15mm, d4 is 1.2～2mm, N4 is 1.9～2.03, and v4 is 17～20;

5R1 is 10～15mm, 5R2 is -8～-12mm, d5 is 4～5mm, N5 is 1.7～1.75, v5 is 45～55;

6R1 is 20～30mm, 6R2 is -80～-120mm, d6 is 1.5～2mm, N6 is 2～2.1, v6 is 22～30;

7R1 is -8～-11mm, 7R2 is -15～-25mm, d7 is 1.5～2mm, N7 is 2～2.1, v7 is 22～30;

Among them, 1R1 to 7R1 are the curvature radii of the front surfaces of the first lens to the seventh lens in order, 1R2 to 7R2 are the curvature radii of the rear surfaces of the first lens to the seventh lens in order, and d1 to d7 are the first to the seventh lens in order. The central thickness of , N1 to N7 are the refractive indices of the first lens to the seventh lens in sequence, and v1 to v7 are the Abbe coefficients of the first lens to the seventh lens in sequence.

In order to facilitate the fixed installation of each lens, the 3D radar lens further includes a front pressure ring, a first spacer, a second spacer, a third spacer, a fourth spacer, and a fifth spacer;

The front pressure ring is fixedly connected with the outer thread provided on the front part of the outer barrel wall of the main lens barrel through its inner threaded hole, and the front end of the front pressure ring is provided with a front end that protrudes in the direction of the optical axis and is located in front of the front end barrel mouth of the main lens barrel. an annular inner flange on the side for limiting the position of the front end of the first lens;

The first spacer, the second spacer, the third spacer, the fourth spacer, and the fifth spacer are all fixedly installed in the barrel of the main lens barrel, and the first spacer is located between the first lens and the second spacer. The lenses are used to define the air space between the two, the second spacer is located between the second lens and the third lens to define the air space between the two, and the third spacer is located between the third lens and the fourth lens. In order to define the air space between the two, the fourth spacer is located between the fifth lens and the sixth lens to define the air space between the two, and the fifth spacer is located between the sixth lens and the seventh lens to define the two The rear end of the inner barrel wall of the main lens barrel is provided with an annular limiting inner flange protruding in the direction of the optical axis for limiting the position of the rear end of the seventh lens.

Preferably, the tolerance of the length of the first spacer in the direction parallel to the optical axis is ±0.02mm, the tolerance of the length of the second spacer in the direction parallel to the optical axis is ±0.02mm, and the length of the third spacer in the direction parallel to the optical axis is ±0.02mm. The tolerance of the length in the axial direction is ±0.015mm, the tolerance of the length of the fourth spacer in the direction parallel to the optical axis is ±0.02mm, and the tolerance of the length of the fifth spacer in the direction parallel to the optical axis is ±0.02mm.

Preferably, the first lens is made of heavy lanthanum flint glass material, and the fourth lens is made of heavy flint glass material.

Preferably, the main lens barrel is integrally processed and formed, and the fit tolerance between the inner diameter of the main lens barrel and the outer diameter of each lens and each spacer is H6/f7.

Compared with the prior art, the beneficial effects of the present invention are:

1. The present invention provides a 3D radar lens with an aperture of 0.8. The lens adopts two sets of seven-piece lens structure, which has the characteristics of strong light receiving ability and can effectively improve the ranging distance of lidar.

2. In the 3d radar lens provided by the present invention, the first lens and the fourth lens are both biconcave lenses, and the first lens is made of heavy lanthanum flint glass material, and the fourth lens is made of heavy flint glass material, so that the first lens is made of heavy lanthanum flint glass material. The lens and the fourth lens can bear most of the spherical aberration of the system (because the lidar is a monochromatic light system, the system mainly controls the spherical aberration), which facilitates the correction of the overall spherical aberration of the system and reduces the tolerance sensitivity of the system.

3. The 3d radar lens provided by the present invention, wherein the main lens barrel is processed in one piece, which reduces the step surface, effectively improves the processing accuracy, and improves the pass rate of the lens.

Description of drawings

1 is a schematic structural diagram of a 3d radar lens of the present invention;

Fig. 2 is the system Seidel aberration diagram of the 3d radar lens of the present invention;

3 is a system MTF diagram of a 3d radar lens of the present invention;

FIG. 4 is a system point diagram of the 3D radar lens of the present invention.

Label description: 1-Front pressure ring, 2-Main barrel, 3-First spacer, 4-Second spacer, 5-Third spacer, 6-Fourth spacer, 7-Fifth spacer, 8-first lens, 9-second lens, 10-third lens, 11-fourth lens, 12-fifth lens, 13-sixth lens, 14-seventh lens, 15-photosensitive chip.

Detailed ways

The present invention is described in detail below in conjunction with the accompanying drawings:

As shown in FIG. 1 , a 3D radar lens is characterized in that it includes a main lens barrel 2, a front lens group, a diaphragm, a rear lens group, and a front lens group, a diaphragm, a rear lens group, and a lens group arranged in the main lens barrel 2 in order along the light incident direction. The photosensitive chip 15 at the rear end of the lens barrel 2, the optical power of the front lens group is 8-20 mm, and the optical power of the rear lens group is 8.5-15 mm;

The front mirror group includes a first lens 8, a second lens 9 and a third lens 10 arranged in sequence along the light incident direction, and the rear mirror group includes a fourth lens 11 and a fifth lens 12 arranged in sequence along the light incident direction. , the sixth lens 13 and the seventh lens 14;

The first lens 8 is a double concave lens, the second lens 9 is a double convex lens, the third lens 10 is a double convex lens, the fourth lens 11 is a double concave lens, and the fifth lens 12 is a double convex lens, The sixth lens 13 is a biconvex lens, the seventh lens 14 is a meniscus lens, the air space between the first lens 8 and the second lens 9 is 2-2.5mm, and the second lens 9 and the third lens The air gap between 10 is 0.05-0.25mm, the rear end surface of the third lens 10 is a diaphragm surface, the air gap between the third lens 10 and the fourth lens 11 is 2-3.5mm, and the fourth lens 11 It forms a close bonding group with the fifth lens 12, the air gap between the fifth lens 12 and the sixth lens 13 is 0.05-0.25mm, and the air gap between the sixth lens 13 and the seventh lens 14 is 0.05～0.25mm;

Each of the described lenses satisfies the following optical conditions:

1R1 is -10～-50mm, 1R2 is 10～30mm, d1 is 0.6～1mm, N1 is 1.8～1.95, v1 is 35～50;

2R1 is 15～35mm, 2R2 is -10～-20mm, d2 is 2.5～4mm, N2 is 1.95～2.07, v2 is 25～32;

3R1 is 14.5～35mm, 3R2 is -100～-150mm, d3 is 2～2.5mm, N3 is 1.72～1.85, v3 is 22～30;

4R1 is -7～-12mm, 4R2 is 10～15mm, d4 is 1.2～2mm, N4 is 1.9～2.03, and v4 is 17～20;

5R1 is 10～15mm, 5R2 is -8～-12mm, d5 is 4～5mm, N5 is 1.7～1.75, v5 is 45～55;

6R1 is 20～30mm, 6R2 is -80～-120mm, d6 is 1.5～2mm, N6 is 2～2.1, v6 is 22～30;

7R1 is -8～-11mm, 7R2 is -15～-25mm, d7 is 1.5～2mm, N7 is 2～2.1, v7 is 22～30;

Among them, 1R1 to 7R1 are the curvature radii of the front surfaces of the first lens to the seventh lens in order, 1R2 to 7R2 are the curvature radii of the rear surfaces of the first lens to the seventh lens in order, and d1 to d7 are the first to the seventh lens in order. The central thickness of , N1 to N7 are the refractive indices of the first lens to the seventh lens in sequence, and v1 to v7 are the Abbe coefficients of the first lens to the seventh lens in sequence.

As shown in Figure 1, in order to facilitate the fixed installation of each lens, the 3d radar lens further includes a front pressure ring 1, a first spacer 3, a second spacer 4, a third spacer 5, a fourth spacer 6, and the fifth spacer 7;

The front pressure ring 1 is fixedly connected with the external thread provided on the front part of the outer cylinder wall of the main lens barrel 2 through its inner thread hole, and the front end of the front pressure ring 1 is provided with a protruding toward the direction of the optical axis and is located in the main lens barrel 2. The annular inner flange on the front side of the front-end barrel mouth is used to limit the front-end position of the first lens 8;

The first spacer 3, the second spacer 4, the third spacer 5, the fourth spacer 6, and the fifth spacer 7 are all fixedly installed in the barrel of the main lens barrel 2, and the first spacer 3 It is located between the first lens 8 and the second lens 9 to define the air space between the two, the second spacer 4 is located between the second lens 9 and the third lens 10 to define the air space between the two, and the third spacer The ring 6 is located between the third lens 10 and the fourth lens 11 to define the air space between the two, and the fourth spacer 6 is located between the fifth lens 12 and the sixth lens 13 to define the air space between the two. The fifth spacer 7 is located between the sixth lens 13 and the seventh lens 14 to define the air space between them. The rear end of the seventh lens 14 is an annular limiting inner flange for limiting the position.

Preferably, the tolerance of the length of the first spacer 3 in the direction parallel to the optical axis is ±0.02mm, the tolerance of the length of the second spacer 4 in the direction parallel to the optical axis is ±0.02mm, and the length of the third spacer 5 is ±0.02mm. The tolerance of the length parallel to the optical axis is ±0.015mm, the tolerance of the fourth spacer 6 in the direction parallel to the optical axis is ±0.02mm, and the tolerance of the fifth spacer 7 in the direction parallel to the optical axis is ±0.02 mm.

Preferably, the first lens 8 is made of heavy lanthanum flint glass material, and the fourth lens 11 is made of heavy flint glass material.

Preferably, the main lens barrel 2 is integrally processed and formed, and the fit tolerance between the inner diameter of the main lens barrel 2 and the outer diameter of each lens and each spacer is H6/f7.

FIG. 2 is a system Seidel aberration diagram of the 3d radar lens of the present invention. From this diagram, it can be seen that the first and fourth lenses bear most of the spherical aberration, and the rest of the aberrations are relatively uniform.

FIG. 3 is a system MTF diagram of the 3d radar lens of the present invention. From this view, it can be seen that the system resolution meets the usage requirements.

FIG. 4 is a system point diagram of the 3D radar lens of the present invention. From this view, it can be seen that the system resolution meets the usage requirements.

Although the present invention has been illustrated and described in terms of specific embodiments and its alternatives, it should be understood that various changes and modifications may be implemented without departing from the spirit and scope of the invention. Therefore, it should be understood that the present invention is not to be limited in any way, except by the appended claims and their equivalents.

Claims (5)

1. A3 d radar lens, its characterized in that: the lens barrel comprises a main lens barrel (2), a front lens group, a diaphragm, a rear lens group and a photosensitive chip (15), wherein the front lens group, the diaphragm and the rear lens group are sequentially arranged in the main lens barrel (2) along the light incidence direction, the photosensitive chip (15) is arranged at the rear end of the main lens barrel (2), the focal power of the front lens group is 8-20 mm, and the focal power of the rear lens group is 8.5-15 mm;

the front lens group comprises a first lens (8), a second lens (9) and a third lens (10) which are sequentially arranged along the light incidence direction, and the rear lens group comprises a fourth lens (11), a fifth lens (12), a sixth lens (13) and a seventh lens (14) which are sequentially arranged along the light incidence direction;

the first lens (8) is a biconcave lens, the second lens (9) is a biconvex lens, the third lens (10) is a biconvex lens, the fourth lens (11) is a biconcave lens, the fifth lens (12) is a biconvex lens, the sixth lens (13) is a biconvex lens, the seventh lens (14) is a meniscus lens, the air space between the first lens (8) and the second lens (9) is 2-2.5 mm, the air space between the second lens (9) and the third lens (10) is 0.05-0.25 mm, the rear end surface of the third lens (10) is a diaphragm surface, the air space between the third lens (10) and the fourth lens (11) is 2-3.5 mm, the fourth lens (11) and the fifth lens (12) form a sealed adhesive combination, and the air space between the fifth lens (12) and the sixth lens (13) is 0.05-0.25 mm, the air gap interval between the sixth lens (13) and the seventh lens (14) is 0.05-0.25 mm;

the lenses satisfy the following optical conditions:

the thickness of the film is-10 to-50 mm for 1R1, 10 to 30mm for 1R2, 0.6 to 1mm for d1, 1.8 to 1.95 for N1 and 35 to 50 for v 1;

15-35 mm for 2R1, -10-20 mm for 2R2, 2.5-4 mm for d2, 1.95-2.07 for N2, and 25-32 for v 2;

14.5-35 mm for 3R1, -100-150 mm for 3R2, 2-2.5 mm for d3, 1.72-1.85 for N3, and 22-30 for v 3;

4R1 is-7 to-12 mm, 4R2 is 10 to 15mm, d4 is 1.2 to 2mm, N4 is 1.9 to 2.03, and v4 is 17 to 20;

10-15 mm for 5R1, -8-12 mm for 5R2, 4-5 mm for d5, 1.7-1.75 for N5, and 45-55 for v 5;

20-30 mm for 6R1, minus 80-minus 120mm for 6R2, 1.5-2 mm for d6, 2-2.1 for N6, and 22-30 for v 6;

7R1 is-8 to-11 mm, 7R2 is-15 to-25 mm, d7 is 1.5 to 2mm, N7 is 2 to 2.1, and v7 is 22 to 30;

wherein, 1R 1-7R 1 are curvature radiuses of front end faces of the first lens to the seventh lens in sequence, 1R 2-7R 2 are curvature radiuses of rear end faces of the first lens to the seventh lens in sequence, d 1-d 7 are center thicknesses of the first lens to the seventh lens in sequence, N1-N7 are refractive indexes of the first lens to the seventh lens in sequence, and v 1-v 7 are abbe coefficients of the first lens to the seventh lens in sequence.

2. The 3d radar lens of claim 1, wherein: the 3d radar lens further comprises a front pressing ring (1), a first space ring (3), a second space ring (4), a third space ring (5), a fourth space ring (6) and a fifth space ring (7);

the front pressing ring (1) is fixedly connected with an external thread arranged at the front part of the outer cylinder wall of the main lens cone (2) through an internal threaded hole of the front pressing ring, and the front end of the front pressing ring (1) is provided with an annular internal flange which protrudes towards the direction of an optical axis and is positioned at the front side of a front end cylinder opening of the main lens cone (2) and used for limiting the front end position of the first lens (8);

the first space ring (3), the second space ring (4), the third space ring (5), the fourth space ring (6) and the fifth space ring (7) are fixedly installed in a cylinder body of the main lens barrel (2), the first space ring (3) is located between the first lens (8) and the second lens (9) and used for limiting air space between the first lens and the second lens, the second space ring (4) is located between the second lens (9) and the third lens (10) and used for limiting air space between the second lens and the third lens, the third space ring (6) is located between the third lens (10) and the fourth lens (11) and used for limiting air space between the third lens and the fourth lens, the fourth space ring (6) is located between the fifth lens (12) and the sixth lens (13) and used for limiting air space between the sixth lens (13) and the seventh lens (14), the rear end of the inner cylinder wall (2) is provided with a rear end, protruding towards the direction of an optical axis, used for facing the seventh lens (14), and protruding towards the rear end of the seventh lens (14) is arranged at the rear end of the inner end of the main lens barrel wall (2 And the annular limiting inner flange is used for limiting.

3. The 3-d radar lens of claim 2, wherein: the tolerance of the length of the first space ring (3) in the direction parallel to the optical axis is +/-0.02 mm, the tolerance of the length of the second space ring (4) in the direction parallel to the optical axis is +/-0.02 mm, the tolerance of the length of the third space ring (5) in the direction parallel to the optical axis is +/-0.015 mm, the tolerance of the length of the fourth space ring (6) in the direction parallel to the optical axis is +/-0.02 mm, and the tolerance of the length of the fifth space ring (7) in the direction parallel to the optical axis is +/-0.02 mm.

4. The 3d radar lens of claim 1, wherein: the first lens (8) is made of heavy lanthanum flint glass material, and the fourth lens (11) is made of heavy flint glass material.

5. The 3d radar lens of claim 1, wherein: the main lens barrel (2) is integrally machined and formed, and the fit tolerance of the inner diameter of the main lens barrel (2) and the outer diameters of the lenses and the space rings is H6/f 7.

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