CN220438638U - Compact type vehicle-mounted laser radar transmitting lens - Google Patents
Compact type vehicle-mounted laser radar transmitting lens Download PDFInfo
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- CN220438638U CN220438638U CN202322298396.XU CN202322298396U CN220438638U CN 220438638 U CN220438638 U CN 220438638U CN 202322298396 U CN202322298396 U CN 202322298396U CN 220438638 U CN220438638 U CN 220438638U
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Abstract
The utility model discloses a compact vehicle-mounted laser radar transmitting lens, which relates to the technical field of laser transmitting lenses, and sequentially comprises the following components from an image side to an object side along an optical axis direction: a first lens (1) having positive optical power, the first lens (1) having an S1 plane and an S2 plane along an optical axis plane, respectively; a second lens (2) having negative optical power, the second lens (2) being respectively an S3 plane and an S4 plane along an optical axis plane; a square reflection plane mirror (3); the square reflecting plane mirror (3) is an S5 plane along the optical axis plane; a third lens (4) having positive optical power; the third lens (4) is respectively an S6 surface and an S7 surface along the optical axis surface; a circular planar mirror (5). According to the utility model, the structure of the lens is optimized according to the structural layout of the laser transmitter, and the high-temperature-resistant spherical glass lens is adopted, so that the processing difficulty and cost are reduced, and the whole volume of the laser radar transmitting device is reduced according to the cutting of the lens by the effective light-transmitting aperture of the lens.
Description
Technical Field
The utility model relates to the technical field of laser emission lenses, in particular to a compact vehicle-mounted laser radar emission lens.
Background
In recent years, with the great development of intelligent driving, new energy and other technologies, automobiles have moved from traditional fuel oil walking tools to more intelligent. The laser radar is used as the latest intelligent driving sensor, is equivalent to the 'eyes' of an automobile, and has wide application prospect. The laser has the advantages of concentrated capability, good directivity, monochromaticity and the like. Compared with a camera and a millimeter wave radar, the laser radar can detect farther distances, has higher precision, and can also realize point cloud images, thereby realizing higher-order auxiliary driving.
Because the automobile environment is severe, volume limitation, high temperature resistance and the like are the key problems of the application of the vehicle-mounted laser radar, a compact vehicle-mounted laser radar transmitting lens needs to be designed.
Disclosure of Invention
The utility model aims to provide a compact vehicle-mounted laser radar transmitting lens, the designed vehicle-mounted laser radar transmitting device is small in size, the lens design of all glass is adopted, long-time efficient and stable output of laser at the environment temperature of 85 ℃ of a vehicle can be realized, and the divergence angle is small, so that the problems in the background technology are solved.
In order to solve the technical problems, the utility model adopts the following technical scheme:
a compact vehicle-mounted laser radar transmitting lens sequentially comprises, from an image side to an object side along an optical axis direction:
a first lens having positive optical power, the first lens having an S1 plane and an S2 plane along an optical axis plane, respectively;
a second lens having negative optical power, the second lens being an S3 plane and an S4 plane along an optical axis plane, respectively;
square reflecting plane mirror; the square reflecting plane mirror is an S5 plane along the optical axis plane;
a third lens having positive optical power; the third lens is respectively an S6 surface and an S7 surface along the optical axis surface;
a circular planar mirror; the circular plane reflecting mirror is an S8 plane along the optical axis plane;
three-sided turning mirror; the three-face turning mirror is an S9 face along the optical axis.
The technical scheme of the utility model is further improved as follows: along the optical axis direction, the S1 face is the concave surface, the S2 face is the convex surface, the S3 face is the convex surface, the S4 face is the concave surface, the S6 face is the concave surface, the S7 face is the convex surface, the S5 face, the S8 face, the S9 face are all plated 905 nm' S high reflectance coating to reduce the energy loss when laser reflection, the light path collimation of laser can be realized to first lens 1, second lens 2, third lens 4, first lens 1 and second lens 2 adopt the mode of cutting in order to reduce the volume of lens, when trilateral turning mirror 6 carries out fast rotation, the emergent light beam carries out horizontal scanning.
The technical scheme of the utility model is further improved as follows: the first lens, the second lens and the third lens are all made of glass materials, the Abbe number Vd is more than or equal to 23, and the optical distortion is less than 4.4%.
The technical scheme of the utility model is further improved as follows: the effective focal length EFL of the laser radar transmitting device satisfies the following conditions: 80mm < EFL < 120mm, and the total length TTL satisfies the following conditions: 40mm < TTL < 100mm.
The technical scheme of the utility model is further improved as follows: the half field angle HFOV of the imaging lens satisfies the following condition: the imaging lens satisfies that the contrast ratio of the imaging lens is larger than 0.5 at the characteristic frequency of 0.54 lp/mr.
The technical scheme of the utility model is further improved as follows: the refractive index Nd of the first lens, the second lens and the third lens is more than or equal to 1.8.
The technical scheme of the utility model is further improved as follows: the analytic force MTF of the system is more than 50% @0.54lp/mrad, the optical distortion is less than 4.5%, the maximum view field laser divergence angle theta is less than 1.6mrad, and more than 90% of laser energy is collected on the measured object when the analytic force MTF is more than 1.3 mrad.
By adopting the technical scheme, compared with the prior art, the utility model has the following technical progress:
1. the utility model provides a compact vehicle-mounted laser radar transmitting lens, which optimizes the structure of the lens according to the structural layout of a laser transmitter, adopts a high-temperature-resistant spherical glass lens, reduces processing difficulty and cost, cuts the lens according to the effective light-transmitting caliber of the lens, and further reduces the whole volume of the laser radar transmitting device.
2. The utility model provides a compact vehicle-mounted laser radar transmitting lens, which adopts a three-time 90-degree plane reflection optical structure, reduces the whole volume of a laser transmitting device and has a compact structure.
3. The utility model provides a compact vehicle-mounted laser radar transmitting lens, which has relatively small optical caliber, compact structure, improved system space utilization and smaller divergence angle of emergent laser.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the present utility model;
FIG. 2 is a schematic view of the optical path of the present utility model;
FIG. 3 is a geometric in-turn energy plot of the present utility model;
FIG. 4 is a field diagram of the present utility model;
FIG. 5 is a distortion chart of the present utility model;
fig. 6 is an MTF graph of the present utility model.
In the figure: 1. a first lens; 2. a second lens; 3. square reflecting plane mirror; 4. a third lens; 5. a circular planar mirror; 6. three-sided turning mirror.
Detailed Description
The utility model is further illustrated by the following examples:
as shown in fig. 1 to 6, the present utility model provides a compact vehicle-mounted lidar emission lens, comprising, in order from an image side to an object side along an optical axis direction:
a first lens 1 having positive optical power, the first lens 1 having an S1 plane and an S2 plane along an optical axis plane, respectively;
a second lens 2 having negative optical power, the second lens 2 having an S3 plane and an S4 plane along the optical axis plane, respectively;
square reflecting plane mirror 3; the square reflecting plane mirror 3 is an S5 plane along the optical axis plane;
a third lens 4 having positive optical power; the third lens 4 is respectively an S6 surface and an S7 surface along the optical axis surface;
a circular planar mirror 5; the circular plane reflector 5 is an S8 plane along the optical axis plane;
a three-sided turning mirror 6; the three-sided turning mirror 6 has an S9 plane along the optical axis.
Wherein, along the optical axis direction, the S1 surface is a concave surface, the S2 surface is a convex surface, the S3 surface is a convex surface, the S4 surface is a concave surface, the S6 surface is a concave surface, the S7 surface is a convex surface, and three surfaces of the S5 surface, the S8 surface and the S9 surface are all plated with 905nm high reflection films.
Wherein the first lens 1, the second lens 2 and the third lens 4 are all made of glass materials, the Abbe number Vd is more than or equal to 23, and the optical distortion is less than 4.4%;
wherein the effective focal length EFL of the laser radar transmitting device satisfies the following conditions: 80mm < EFL < 120mm, and the total length TTL satisfies the following conditions: TTL is more than 40mm and less than 100mm;
wherein the half field angle HFOV of the imaging lens satisfies the following condition: the imaging lens is more than 1 DEG and less than 10 DEG, and the contrast ratio of the imaging lens is more than 0.5 under the characteristic frequency of 0.54 lp/mr;
wherein the refractive index Nd of the first lens 1, the second lens 2 and the third lens 4 is more than or equal to 1.8;
the analytic force MTF of the system is more than 50% @0.54lp/mrad, the optical distortion is less than 4.5%, the maximum view field laser divergence angle theta is less than 1.6mrad, and more than 90% of laser energy is collected on the measured object when the analytic force MTF is more than 1.3 mrad.
In addition, as shown in fig. 1, the 0-bit laser array, the first lens 1, the second lens 2 and the third lens 4 are all laser collimating lenses, the first lens 1 and the second lens 2 adopt a cutting mode to reduce the volume of the lenses, and when the three-sided rotating mirror 6 rotates rapidly, the emergent light beam scans horizontally.
As shown in fig. 2, the present utility model proposes an optical path diagram of a transmitting device of a vehicle-mounted laser radar, which sequentially includes, from a laser transmitting end along an optical axis direction: the laser array 0 comprises a first lens 1 with positive focal power, a second lens 2 with negative focal power, a square reflecting plane mirror 3 and a third lens 4 with positive focal power, wherein three surfaces of an S5 surface, an S8 surface and an S9 surface are plated with 905nm high reflecting films so as to reduce energy loss during laser reflection, and the first lens 1, the second lens 2 and the third lens 4 can realize light path collimation of laser.
Example 1
In the embodiment, the total length of the internal optical path of the device is 121.9mm, the effective focal length EFL=98 mm, the half field angle HFOV=6.6 degrees, the resolution MTF of the system is more than 50% @0.54lp/mrad, the optical distortion is less than 4.5%, the maximum field laser divergence angle theta is less than 1.6mrad, and when the maximum field laser divergence angle theta is greater than 1.3mrad, the laser energy of more than 90% can be collected on a measured object, and meanwhile, the lens has good stability by adopting glass, so that the temperature drift phenomenon caused by temperature change on the system can be reduced on a vehicle.
Table 1 detailed parameters of lens design
| Surface of the body | Surface classification | Radius (mm) | Center thickness of | Refractive index (Nd) | Abbe number (Vd) | Caliber (mm) |
| Object plane | Spherical surface | Infinity of infinity | 16.2 | 23.7 | ||
| S1 | Spherical surface | -82.7 | 17.1 | 1.846 | 23.8 | 25.8 |
| S2 | Spherical surface | -46.6 | 1.993 | 28.5 | ||
| S3 | Spherical surface | 57.4 | 17 | 1.84 | 23.8 | 25.3 |
| S4 | Spherical surface | 29.7 | 26.7 | 20 | ||
| S5 | Spherical surface | Infinity of infinity | 0 | 22 | ||
| S6 | Spherical surface | 150.6 | -14.3 | 1.85 | 24.0 | 23 |
| S7 | Spherical surface | 50.2 | -28.5 | 24.2 | ||
| S8 | Spherical surface | Infinity of infinity | 0 | 21.85 | ||
| S9 | Spherical surface | Infinity of infinity | 0 | 30.4 |
In conclusion, the three-time 90-degree plane reflection optical structure adopted by the utility model reduces the whole volume of the laser emitter, has a compact structure, optimizes the structure of the lens according to the structural layout of the laser emitter, reduces the processing difficulty and cost by adopting the high-temperature-resistant spherical glass lens, further reduces the whole volume of the laser radar emitter according to the cutting of the lens by the effective light-passing caliber of the lens, reduces the processing difficulty and cost, can effectively solve the problem of high temperature resistance of materials, solves the hundred-meter detection of the laser radar, and realizes the point cloud picture.
The foregoing utility model has been generally described in great detail, but it will be apparent to those skilled in the art that modifications and improvements can be made thereto. Accordingly, it is intended to cover modifications or improvements within the spirit of the inventive concepts.
Claims (7)
1. The utility model provides a on-vehicle laser radar emission camera lens of compact, its characterized in that: the optical axis direction from the image side to the object side sequentially comprises:
a first lens (1) having positive optical power, the first lens (1) having an S1 plane and an S2 plane along an optical axis plane, respectively;
a second lens (2) having negative optical power, the second lens (2) being respectively an S3 plane and an S4 plane along an optical axis plane;
a square reflection plane mirror (3); the square reflecting plane mirror (3) is an S5 plane along the optical axis plane;
a third lens (4) having positive optical power; the third lens (4) is respectively an S6 surface and an S7 surface along the optical axis surface;
a circular planar mirror (5); the circular plane reflecting mirror (5) is an S8 plane along the optical axis plane;
a three-sided turning mirror (6); the three-sided rotating mirror (6) is an S9 plane along the optical axis plane.
2. The compact vehicle-mounted lidar transmission lens of claim 1, wherein: along the optical axis direction, the S1 surface is a concave surface, the S2 surface is a convex surface, the S3 surface is a convex surface, the S4 surface is a concave surface, the S6 surface is a concave surface, the S7 surface is a convex surface, and three surfaces of the S5 surface, the S8 surface and the S9 surface are plated with 905nm high-reflection films.
3. The compact vehicle-mounted lidar transmission lens of claim 1, wherein: the first lens (1), the second lens (2) and the third lens (4) are all made of glass materials, the Abbe number Vd is more than or equal to 23, and the optical distortion is less than 4.4%.
4. The compact vehicle-mounted lidar transmission lens of claim 1, wherein: the effective focal length EFL of the laser radar transmitting device satisfies the following conditions: 80mm < EFL < 120mm, and the total length TTL satisfies the following conditions: 40mm < TTL < 100mm.
5. The compact vehicle-mounted lidar transmission lens of claim 1, wherein: the half field angle HFOV of the imaging lens satisfies the following condition: the imaging lens satisfies that the contrast ratio of the imaging lens is larger than 0.5 at the characteristic frequency of 0.54 lp/mr.
6. The compact vehicle-mounted lidar transmission lens of claim 1, wherein: the refractive index Nd of the first lens (1), the second lens (2) and the third lens (4) is more than or equal to 1.8.
7. The compact vehicle-mounted lidar transmission lens of claim 1, wherein: the analytic force MTF of the system is more than 50% @0.54lp/mrad, the optical distortion is less than 4.5%, the maximum view field laser divergence angle theta is less than 1.6mrad, and more than 90% of laser energy is collected on the measured object when the analytic force MTF is more than 1.3 mrad.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322298396.XU CN220438638U (en) | 2023-08-25 | 2023-08-25 | Compact type vehicle-mounted laser radar transmitting lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322298396.XU CN220438638U (en) | 2023-08-25 | 2023-08-25 | Compact type vehicle-mounted laser radar transmitting lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220438638U true CN220438638U (en) | 2024-02-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322298396.XU Active CN220438638U (en) | 2023-08-25 | 2023-08-25 | Compact type vehicle-mounted laser radar transmitting lens |
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| Country | Link |
|---|---|
| CN (1) | CN220438638U (en) |
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2023
- 2023-08-25 CN CN202322298396.XU patent/CN220438638U/en active Active
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