Photomask for laser radar, preparation method of photomask and laser radar

Abstract

The invention provides a photomask for a laser radar, a preparation method of the photomask and the laser radar, the laser radar comprises a photomask fixing part, the photomask is installed on the photomask fixing part, and the photomask comprises a body which is provided with an inner surface and an outer surface opposite to the inner surface; and the first light-transmitting conductive film is arranged on the body and covers the inner surface or the outer surface, and the first light-transmitting conductive film is connected and conducted with the photomask fixing part, so that the laser radar can shield electromagnetic interference. According to the photomask designed by the invention, the electromagnetic interference shielding capability of the laser radar can be greatly enhanced, and the electromagnetic radiation of the laser radar to the outside is reduced, so that the laser radar has electromagnetic compatibility, and the requirement of vehicle-gauge-level electromagnetic compatibility is met.

Description

technical field [0001] The invention relates to the field of photoelectric detection, in particular to a photomask for laser radar, a preparation method thereof, and a laser radar. Background technique [0002] With the rise of autonomous driving technology, lidar has been paid more and more attention as an important detection component. Lidar, as its name implies, is a radar system that emits a laser beam to detect the position, velocity and other characteristic quantities of a target. Its working principle is to emit a probe beam to the target, and then compare the received echo beam reflected from the target with the probe beam, and after proper processing, the relevant information of the target can be obtained, such as target distance, azimuth, altitude, Parameters such as speed, attitude, and even shape can be used to detect, track and identify targets such as aircraft and missiles. [0003] As a vehicle-grade product, lidar has high requirements for EMC (Electromagne...

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Problems solved by technology

[0004] The existing lidar mostly uses snap-on masks made of PC materials, such as Figure 1a As shown, since the PC material is an insulator, the insulator cannot conduct with the fixed part of the photomask, so that the lidar after the photomask is installed cannot shield electromagnetic interference, and cannot meet the requirements of the electromagnetic compatibility of the vehicle standard

Figure 1b for Figure 1a Partial enlarged view of the snap-on photomask design, the groove will be filled with adhesive, and when the protrusion at the lower end of the photomask is crimped into the side groove of the photomask fixing part, it will be pressed downward, making Adhesive overflows from the left and right sides of the groove (the gap of the buckle), and there will be obvious glue overflow problems, which will affect the appearance

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