Scanning mirror and laser radar

Abstract

The invention provides a scanning mirror. The scanning mirror comprises a reflecting mirror reflecting a light beam and an elastic sheet, wherein the elastic sheet comprises a frame part and a vibrating part, the vibrating part is elastically connected to the frame part through a connection part and is attached to the reflecting mirror, the vibrating part drives the reflecting mirror to rotate around a transverse shaft in a reciprocating manner relative to the frame part, so as to scan light beams in a direction vertical to the transverse shaft. Through adoption of the scanning mirror, a single scanning mirror is used for reflecting the same light beam at different scanning angles, so as to form multiple scanning light beams of different angles, therefore, a scanning effect of approximatemulti-line laser radar is achieved, and the cost is lowered remarkably. Further, the invention provides a laser radar comprising the scanning mirror. The laser radar is low-cost and is small in volumebut has high performance.

Description

technical field [0001] This application relates to scanning mirrors, and in particular to a one-dimensional mechanical galvanometer for scanning beams, and a lidar incorporating such a galvanometer. Background technique [0002] Vehicles may be configured to operate in an autonomous mode, where the vehicle navigates through an environment with little or no driver intervention. Such autonomous vehicles may include one or more sensors, such as lidar, configured to detect information about the environment surrounding the vehicle. [0003] Lidar has a laser and a detector. The detector can detect the laser light emitted by the laser and reflected by the reflective object. By measuring the flight time of the laser light, the distance of the reflective object can be determined. By scanning a certain area quickly and repeatedly with lidar, continuous real-time information on the distances of all reflective objects in the area can be obtained. Combining distance, laser orientation...

AI Technical Summary

Problems solved by technology

For example, solid-state lidar uses MEMS two-dimensional scanning mirror to scan laser, which has the advantages of compact structure and fast scanning speed, but limited by the constraints of semiconductor technology, the cost of MEMS scanning mirror is very high, which limits the application of solid-state lidar

Multi-line laser radar uses multiple lasers arranged in a row in the vertical direction, and uses a rotating structure to rotate multiple lasers to realize scanning in the horizontal direction. Although this structure can reduce costs, it has the disadvantages of large volume and limited wiring harness. problems, its performance is difficult to meet the growing demand

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