Laser radar optical system and laser radar
By using the semi-transparent half-inverted and total reversed zone structure of a 45° reflector in the lidar optical system, the collimation and convergence of lasers is achieved, and the problem of reflector affecting the sensitivity and processing cost of receivers in the prior art is solved. , improves the sensitivity of the detector and reduces the volume and assembly cost of the optical components.
Patent Information
- Application Number
- CN202420647521.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-29
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2034-03-29
AI Technical Summary
In the existing lidar optical system, the reflector is located above the reflective surface, resulting in a lower sensitivity of the receiver and a higher cost of processing the reflective surface.
Using a 45° reflector sheet, the detector chip and laser chip are arranged above and below the 45° reflector sheet. The middle area of the 45° reflector sheet is a semi-transparent and semi-reverse area, and the coupling between the semi-transparent and semi-reverse area and the optical outlet of the laser chip is accurate. A straight lens, a convergence lens is coupled between the total invert region and the inlet port of the detector chip to achieve laser collimation and convergence and improve the sensitivity of the detector.
It effectively improves the sensitivity of the detector chip, especially the detection of reflected light from distant target objects, and reduces the volume and assembly process of the optical element, and reduces the cost.
Smart Images
Figure CN222280829U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of laser radars, and in particular to a laser radar optical system and a laser radar. Background Art
[0002] Patent application number 2022230230981 discloses a laser radar optical system and a laser radar, which have the following structure: a transmitting optical path capable of transmitting optical signals and a receiving optical path capable of receiving optical signals are formed in the laser radar optical system, and the laser radar optical system includes: a transmitter, arranged in the transmitting optical path, for transmitting optical signals; a receiver, arranged in the receiving optical path, for receiving optical signals; and an optical element, formed with a reflective surface, which is simultaneously in the transmitting optical path and the receiving optical path; a reflector is provided on the transmitting optical path, the reflector is located between the transmitter and the optical element, and the reflective surface of the reflector is arranged opposite to the reflective surface. Since the reflector in this scheme is above the reflective surface, the reflector will block the light of the receiver, resulting in a decrease in the sensitivity of the receiver, and the processing cost of the reflective surface is also relatively high. Utility Model Content
[0003] The technical problem to be solved by the utility model is to provide a laser radar optical system and a laser radar to overcome the deficiencies in the above-mentioned prior art.
[0004] The technical solution of the utility model to solve the above technical problems is as follows: a laser radar optical system, comprising: a 45° reflector, a detector chip and a laser chip are arranged above and below the 45° reflector respectively, the middle area of the 45° reflector is a semi-transparent and semi-reflective area, and the other areas on the upper surface of the 45° reflector are fully reflective areas, a collimating lens is coupled between the semi-transparent and semi-reflective area and the light outlet of the laser chip, and a converging lens is coupled between the fully reflective area and the light entrance of the detector chip.
[0005] The beneficial effect of the utility model is that the laser emitted by the laser chip is collimated by the collimating lens and then enters the semi-transparent and semi-reflective area in the middle of the 45° reflective sheet, and then is emitted to the target object, while the light beam reflected from the target object is reflected to the converging lens through the fully reflective area on the upper surface of the 45° reflective sheet, and is converged by the converging lens into the light entrance of the detector chip to realize the detection of reflected light. The laser emitted by the laser chip will first be collimated by the collimating lens, and because the diameter of the collimated light spot is usually small, the area of the semi-transparent and semi-reflective area can be very small, and the fully reflective area can be very large, which will not affect the detection of reflected light, and effectively improve the sensitivity of the detector chip, especially for the light reflected from farther targets.
[0006] On the basis of the above technical solution, the present invention can also be improved as follows.
[0007] Furthermore, the diameter of the semi-transmissive and semi-reflective area is 0.1 mm larger than the diameter of the collimated light spot emitted from the collimating lens.
[0008] Furthermore, the semi-transmissive and semi-reflective area adopts a ratio of 50% transmission: 50% total reflection.
[0009] Furthermore, the 45° reflective sheet includes: a substrate, a hole in the middle of the substrate, a semi-reflective and semi-transparent sheet embedded in the hole in the middle of the substrate, the area in which the semi-reflective and semi-transparent sheet is embedded in the middle of the substrate is a semi-transparent and semi-reflective area, and the other areas on the upper surface of the substrate except the middle opening are coated with a total reflection film, and the area on the upper surface of the substrate coated with the total reflection film is a total reflection area.
[0010] The above further beneficial effects are: compared with the prior art, the optical element of this structure can reduce the volume and assembly process, and does not need to process the reflective curved surface, thereby effectively reducing the cost.
[0011] Based on the above technical solution, the utility model also provides a laser radar, including a laser radar optical system.
[0012] A further beneficial effect of adopting the above is that applying the laser radar optical system to the laser radar can improve the sensitivity of the laser radar. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 This is a light path diagram of the laser radar optical system in the utility model.
[0014] In the accompanying drawings, the components represented by the reference numerals are listed as follows:
[0015] 1. 45° reflective sheet, 110, substrate, 120, semi-reflective and semi-transparent sheet, 130, total reflection film, 2. detector chip, 3. laser chip, 4. collimating lens, 5. converging lens. DETAILED DESCRIPTION
[0016] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.
[0017] Example 1
[0018] like Figure 1As shown, a laser radar optical system comprises: a 45° reflector 1, a detector chip 2 is arranged above the 45° reflector 1, and a laser chip 3 is arranged below the 45° reflector 1, the middle area of the 45° reflector 1 is a semi-transparent and semi-reflective area, and the other areas on the upper surface of the 45° reflector 1 are full-reflective areas, a collimating lens 4 is coupled between the semi-transparent and semi-reflective area of the 45° reflector 1 and the light outlet of the laser chip 3, and a converging lens 5 is coupled between the full-reflective area of the 45° reflector 1 and the light entrance of the detector chip 2; the laser emitted by the laser chip 3 is collimated by the collimating lens 4 and enters the 45° reflector The semi-transparent and semi-reflective area in the middle of the reflective sheet 1 is then emitted to the target object, and the light beam reflected from the target object is reflected to the converging lens 5 through the fully reflective area on the upper surface of the 45° reflective sheet 1, and is converged by the converging lens 5 into the light entrance of the detector chip 2 to realize the detection of the reflected light. The laser emitted by the laser chip 3 will first be collimated by the collimating lens 4, and because the diameter of the collimated light spot is usually small, the area of the semi-transparent and semi-reflective area can be very small, and the fully reflective area can be very large, which will not affect the detection of the reflected light, and effectively improve the sensitivity of the detector chip 2, especially for the light reflected from farther targets.
[0019] Furthermore, considering the processing and assembly tolerances, the diameter of the semi-transparent and semi-reflective area can be 0.1 mm larger than the diameter of the collimated light spot emitted from the collimating lens 4. At this time, the size of the semi-transparent and semi-reflective area can be minimized. Figure 1 The size of the middle semi-transparent and semi-reflective area is only an example to indicate that the 45° reflective sheet 1 has a semi-transparent and semi-reflective area, and does not mean that its size is relatively large.
[0020] Example 2
[0021] like Figure 1 As shown, this embodiment is a further improvement on the basis of embodiment 1, and the details are as follows:
[0022] The semi-transmissive and semi-reflective area adopts a 50% transmission: 50% total reflection ratio.
[0023] Furthermore: the 45° reflective sheet 1 includes: a substrate 110, a hole in the middle of the substrate 110, a semi-reflective and semi-transparent sheet 120 is embedded in the hole in the middle of the substrate 110, the area in the middle of the substrate 110 where the semi-reflective and semi-transparent sheet 120 is embedded is a semi-transparent and semi-reflective area, the semi-reflective and semi-transparent sheet 120 is usually facing the collimated light spot emitted from the collimating lens 4, and the other areas on the upper surface of the substrate 110 except the middle opening are coated with a total reflection film 130, and the area on the upper surface of the substrate 110 where the total reflection film 130 is coated is a total reflection area. Compared with the prior art, the optical element of this structure can reduce the volume and assembly process, and does not need to process the reflective curved surface, thereby effectively reducing the cost.
[0024] Based on the above embodiments, the utility model also provides a laser radar, including the laser radar optical system described in any one of Embodiments 1 or 2.
[0025] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.
Claims
1. A laser radar optical system, characterized in that: include: A 45° reflector (1), a detector chip (2) and a laser chip (3) are arranged above and below the 45° reflector (1), respectively; the middle area of the 45° reflector (1) is a semi-transparent and semi-reflective area, and the other areas on the upper surface of the 45° reflector (1) are fully reflective areas; a collimating lens (4) is coupled between the semi-transparent and semi-reflective area and the light outlet of the laser chip (3), and a converging lens (5) is coupled between the fully reflective area and the light inlet of the detector chip (2).
2. A laser radar optical system according to claim 1, characterized in that: The diameter of the semi-transmissive and semi-reflective area is 0.1 mm larger than the diameter of the collimated light spot emitted from the collimating lens (4).
3. A laser radar optical system according to claim 1 or 2, characterized in that: The semi-transmissive and semi-reflective area adopts a ratio of 50% transmission: 50% total reflection.
4. A laser radar optical system according to claim 1, characterized in that: The 45° reflective sheet (1) comprises: a substrate (110), wherein the substrate (110) has a hole in the middle, wherein a semi-reflective semi-transparent sheet (120) is embedded in the hole in the middle of the substrate (110), wherein the area in the middle of the substrate (110) where the semi-reflective semi-transparent sheet (120) is embedded is a semi-transparent semi-reflective area, and the other areas on the upper surface of the substrate (110) except the middle opening are coated with a total reflection film (130), and the area on the upper surface of the substrate (110) where the total reflection film (130) is coated is a total reflection area.
5. A laser radar, characterized in that: It comprises a laser radar optical system as described in any one of claims 1 to 4.