Laser radar heating demisting device

Abstract

The utility model discloses a laser radar heating demisting device, and belongs to the technical field of laser radars. The laser radar heating demisting device comprises a transparent substrate, a transparent optical adhesive layer, a transparent protective layer, a nano-silver transparent film and a plastic packaging layer which are sequentially stacked from bottom to top, a pouring sealant layer is arranged on the side edge of the periphery of the transparent optical adhesive layer, and the pouring sealant layer is located between the transparent substrate and the transparent protective layer; the transparent protection layer is recessed downwards to form a containing cavity, the nano-silver transparent film is arranged in the containing cavity, and the upper end face of the nano-silver transparent film is flush with the upper end face of the transparent protection layer. According to the laser radar heating demisting device, the nanometer transparent film is adopted, so that the function of rapidly heating and eliminating water mist in stable operation under safe voltage can be realized, the infrared light transmittance is high, the sealing performance is good, and the long-term stability and effectiveness are effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of lidar technology, specifically to a lidar heating and defogging device. Background Technology

[0002] LiDAR, or Laser Pointer, is a transceiver array consisting of lasers and detectors. By scanning a laser beam, it enables real-time perception of the environment surrounding a vehicle or robot, earning it the nickname "eyes" in autonomous driving and robotics. This real-time perception capability allows LiDAR to accurately acquire the distance and contour information of surrounding objects, providing strong support for obstacle avoidance. Furthermore, combining LiDAR with high-precision maps can help vehicles or robots achieve centimeter-level positioning accuracy in their environment, thus enabling autonomous navigation.

[0003] The core performance of LiDAR is affected by several parameters, including the number of beams, resolution, field of view, and point frequency. Differences in these parameters directly determine the ranging capability and perception accuracy of the LiDAR. The number of beams is one of the important indicators for measuring LiDAR performance; more beams allow for more detailed capture of the 3D contours of objects, thus improving the safety of autonomous driving. However, in actual use, due to drastic changes in temperature and humidity, moisture and fog can form inside and outside the LiDAR, affecting its ranging capability and accuracy. In severe cases, this can even lead to data errors and deviations, thus impacting driving safety.

[0004] Currently, existing lidar systems typically achieve defogging via heating using transparent conductive films such as indium tin oxide (ITO). These films possess excellent conductivity and high transmittance in the visible light spectrum. When energized, they are heated, effectively removing fog. However, indium, the key element in indium oxide, is a rare element with global mineable reserves estimated at around 15,000 tons. The electronics industry consumes approximately 2,000 tons annually, posing a risk of depletion. Furthermore, indium oxide is difficult to produce, with complex and costly processing. Moreover, as ITO is a semiconductor material, the impedance of mainstream ITO films is approximately 150-300 ohms (Ω) per unit area. This conductivity often necessitates a lidar heating voltage of 30-100V to drive the temperature rise. Exceeding this safe voltage range can compromise system safety and increase power consumption. In addition, although ITO material has good transmittance in the visible light range, its transmittance in the infrared band of lidar drops sharply. For lidar with wavelengths of 1550nm or 905nm, the transmittance drops to below 50%, which completely fails to meet the requirement of infrared light transmittance >85%. Therefore, ITO cannot be used as a transparent heating module material in lidar.

[0005] In contrast, silver nanowires are abundant, have a simpler preparation process, and lower production costs, making them the best alternative to indium tin oxide (ITO) and metal meshes. Therefore, it is essential to develop a silver nanowire-based lidar heating and defogging device to address the problems of high voltage, low infrared light transmittance, and poor stability inherent in existing ITO transparent conductive film-based lidar heating and defogging devices. Utility Model Content

[0006] In order to overcome the shortcomings of the existing technology, the purpose of this utility model is to provide a laser radar heating and defogging device. This device can achieve rapid heating and defogging function under safe voltage by using a nano transparent film. It has high infrared light transmittance and good long-term stability.

[0007] To solve the above problems, the technical solution adopted by this utility model is as follows:

[0008] A lidar heating and defogging device includes, from bottom to top, a transparent substrate, a transparent optical adhesive layer, a transparent protective layer, a nano-silver transparent film, and a plastic encapsulation layer; a potting adhesive layer is disposed around the periphery of the transparent optical adhesive layer, and the potting adhesive layer is located between the transparent substrate and the transparent protective layer; the transparent protective layer is recessed downward to form an accommodating cavity, and the nano-silver transparent film is disposed within the accommodating cavity, with the upper surface of the nano-silver transparent film flush with the upper surface of the transparent protective layer.

[0009] In a preferred embodiment of this utility model, the transparent substrate is one of PET, PI, CPI, PMMA, and PC.

[0010] In a preferred embodiment of this utility model, the thickness of the transparent optical adhesive layer is 10~200μm.

[0011] In a preferred embodiment of this utility model, the transparent protective layer is one of polyurethane, acrylic acid, polyether, and polycarbonate.

[0012] In a preferred embodiment of this utility model, the diameter of the silver nanowires in the transparent silver nanofilm is 8~50nm and the length is >5nm.

[0013] In a preferred embodiment of this invention, the sheet resistance of the nano-silver transparent film is <100Ω.

[0014] In a preferred embodiment of this utility model, the plastic encapsulation layer is one of PET, PI, CPI, PMMA, and PC.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] This invention relates to a laser radar heating and defogging device that uses a nano-silver transparent film instead of traditional ITO. This allows the device to stably drive heating under a safe voltage of 5V or below 12V, thereby achieving rapid elimination of water vapor and fog with high safety. Simultaneously, the device exhibits an infrared light transmittance of over 85%, meeting the transmittance requirements of laser radar and effectively overcoming the problem of existing ITO transparent conductive films having a transmittance of less than 50% for the 1550nm or 905nm infrared band. Furthermore, this invention features a multi-layered structure including a transparent substrate, a transparent optical adhesive layer, a transparent protective layer, a nano-silver transparent film, and a plastic encapsulation layer, significantly improving the device's sealing performance and thus enhancing its long-term stability and effectiveness.

[0017] In summary, this invention achieves rapid heating and water mist elimination functions under safe voltage by using a nano-transparent film, exhibiting high infrared light transmittance and good long-term stability. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the lidar heating and defogging device according to Embodiment 1 of this utility model;

[0019] Figure 2 This is a schematic diagram of the structure of the lidar heating and defogging device of Comparative Example 1 of this utility model;

[0020] Figure 3 This is a schematic diagram of the structure of the lidar heating and defogging device of Comparative Example 2 of this utility model;

[0021] Figure 4 This is a schematic diagram of the structure of the lidar heating and defogging device of Comparative Example 3 of this utility model;

[0022] The following are the symbols and their meanings: 1. Transparent substrate; 2. Transparent optical adhesive layer; 3. Transparent protective layer; 4. Nano silver transparent film; 5. Plastic encapsulation layer; 6. Potting compound layer. Detailed Implementation

[0023] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0024] like Figure 1As shown, the lidar heating and defogging device provided by this utility model has a multi-layer structure, specifically including a transparent substrate 1, a transparent optical adhesive layer 2, a transparent protective layer 3, a nano-silver transparent film 4, and a plastic encapsulation layer 5 stacked sequentially from bottom to top. The transparent substrate 1 serves as the supporting material for the lidar heating and defogging device. It is an organic or inorganic substrate material, preferably one of PET, PI, CPI, PMMA (acrylic), or PC. The transparent optical adhesive layer 2 (OCA) serves as the optical adhesive between the transparent substrate 1 and the transparent protective layer 3, and its thickness is preferably 10-200 μm. The transparent protective layer 3 can fully cover the nano-silver transparent film 4, thereby protecting the nano-silver transparent film 4 and giving the device advantages of scratch resistance and light protection, which is beneficial to improving the long-term stability of the device. The transparent protective layer 3 is preferably one of polyurethane coating, acrylic coating, polyether coating, or polycarbonate coating. The nano-silver transparent film 4 contains nano-silver wires with a diameter of 8-50 nm and a length of >5 nm. The nano-silver transparent film 4 constitutes a transparent conductive heating area with a sheet resistance of <100 Ω. The plastic encapsulation layer 5 is used to encapsulate the upper surface of the nano-silver transparent film 4 and the transparent protective layer 3. The plastic encapsulation layer 5 is preferably one of PET, PI, CPI, PMMA, or PC. To improve the sealing performance of the lidar heating and defogging device, a potting compound layer 6 is provided around the four sides of the transparent optical adhesive layer 2, and the potting compound layer 6 is located between the transparent substrate 1 and the transparent protective layer 3, thereby further improving the overall sealing performance of the lidar heating and defogging device. Furthermore, the transparent protective layer 3 has a recessed cavity, within which a nano-silver transparent film 4 is disposed, with its upper surface flush with the upper surface of the transparent protective layer 3. The sidewalls of the cavity in the transparent protective layer 3 provide a sealing protection for the nano-silver transparent film 4, further enhancing its protective properties and thus improving the long-term stability and effectiveness of the lidar heating and defogging device.

[0025] Example 1

[0026] like Figure 1 As shown, this embodiment provides a lidar heating and defogging device, which includes a transparent substrate 1, a transparent optical adhesive layer 2, a transparent protective layer 3, a nano-silver transparent film 4, and a plastic encapsulation layer 5 stacked sequentially from bottom to top. The transparent optical adhesive layer 2 has a potting adhesive layer 6 disposed around its perimeter, and the potting adhesive layer 6 is located between the transparent substrate 1 and the transparent protective layer 3. The transparent protective layer 3 has a recessed cavity, within which the nano-silver transparent film 4 is disposed, with its upper surface flush with the upper surface of the transparent protective layer 3.

[0027] Comparative Example 1

[0028] like Figure 2As shown in the comparative example, this invention provides a lidar heating and defogging device, which includes a transparent substrate 1, a transparent optical adhesive layer 2, a nano-silver transparent film 4, and a plastic encapsulation layer 5 stacked sequentially from bottom to top. The transparent optical adhesive layer 2 has a potting adhesive layer 6 disposed around its four sides, and the potting adhesive layer 6 is located between the transparent substrate 1 and the transparent protective layer 3.

[0029] Comparative Example 2

[0030] like Figure 3 As shown in the comparative example, this invention provides a lidar heating and defogging device, which includes a transparent substrate 1, a transparent optical adhesive layer 2, a transparent protective layer 3, a nano-silver transparent film 4, and a plastic encapsulation layer 5, which are stacked sequentially from bottom to top.

[0031] Comparative Example 3

[0032] like Figure 4 As shown in the comparative example, this invention provides a lidar heating and defogging device, which includes a transparent substrate 1, a transparent optical adhesive layer 2, a transparent protective layer 3, a nano-silver transparent film 4, and a plastic encapsulation layer 5, which are stacked sequentially from bottom to top. The transparent protective layer 3 has a recessed cavity, and the nano-silver transparent film 4 is disposed within the cavity, with its upper surface flush with the upper surface of the transparent protective layer 3.

[0033] Comparative Example 4

[0034] This comparative example provides a lidar heating and defogging device. The difference between this comparative example and Example 1 is that the nano-silver transparent film 4 in Example 1 is replaced with an ITO transparent film, while the other structures are completely consistent with Example 1.

[0035] Performance testing

[0036] 1. High temperature and high humidity resistance test

[0037] The lidar heating and defogging devices of Example 1 and Comparative Examples 1-3 were subjected to high temperature and high humidity experiments under the same conditions. The specific operations are as follows:

[0038] Apply a rated heating voltage of 12V to the entire laser radar heating defogging device. After the laser heating defogging device is running normally, and with the voltage remaining constant, place the entire device in a high temperature and high humidity (temperature 85℃, humidity 85%) test chamber for testing. After several hours, take it out for performance testing. If the original performance remains unchanged, it has passed the corresponding test time.

[0039] The results are shown in Table 1.

[0040] Table 1. High-temperature and high-humidity experimental results of the lidar heating and defogging devices in Example 1 and Comparative Examples 1-3

[0041]

[0042] As shown in Table 1, compared with Comparative Examples 1 to 3, the high temperature and high humidity resistance time of Example 1 is much longer than that of Comparative Examples 1 to 3, which proves that the structural sealing of the lidar heating and defogging device of this utility model is better than that of the comparative examples, and can effectively improve the long-term stability and effectiveness of the device.

[0043] 2. Infrared transmittance

[0044] The infrared transmittance of the lidar heating and defogging devices of Example 1 and Comparative Example 4 at a wavelength of 1550nm was tested, and the results are shown in Table 2.

[0045] Table 2. Infrared transmittance test results of the lidar heating and defogging devices in Example 1 and Comparative Example 4

[0046]

[0047] As shown in Table 2, the lidar heating and defogging device made of nano-silver transparent film in Example 1 has a significantly higher transmittance for infrared light with a wavelength of 1550nm compared to the lidar heating and defogging device made of conventional ITO in Comparative Example 1. This indicates that the present invention can well meet the requirements of lidar for infrared light transmittance.

[0048] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A lidar heating and defogging device, characterized in that: The device comprises, from bottom to top, a transparent substrate, a transparent optical adhesive layer, a transparent protective layer, a nano-silver transparent film, and a plastic encapsulation layer; a potting adhesive layer is disposed around the four sides of the transparent optical adhesive layer, and the potting adhesive layer is located between the transparent substrate and the transparent protective layer; the transparent protective layer is recessed downward to form an accommodating cavity, and the nano-silver transparent film is disposed within the accommodating cavity, with the upper surface of the nano-silver transparent film flush with the upper surface of the transparent protective layer.

2. The lidar heating and defogging device according to claim 1, characterized in that: The transparent substrate is one of PET, PI, CPI, PMMA, and PC.

3. The lidar heating and defogging device according to claim 1, characterized in that: The thickness of the transparent optical adhesive layer is 10~200μm.

4. The lidar heating and defogging device according to claim 1, characterized in that: The transparent protective layer is one of polyurethane, acrylic acid, polyether, and polycarbonate.

5. The lidar heating and defogging device according to claim 1, characterized in that: The diameter of the silver nanowires in the transparent silver nanofilm is 8~50nm and the length is >5nm.

6. The lidar heating and defogging device according to claim 1 or 5, characterized in that: The sheet resistance of the nano-silver transparent film is <100Ω.

7. The lidar heating and defogging device according to claim 1, characterized in that: The plastic encapsulation layer is one of PET, PI, CPI, PMMA, and PC.

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