Abstract
Compact light detection and ranging (LIDAR) with wide scanning angle is required for the environment monitoring of automobile. We have developed a two-dimensional (2D) laser scanner for the LIDAR system with the horizontal scanning angle of 360 degrees. The scanner is composed of an inclined rolling ellipsoidal reflector equipped with a permanent magnet at the center, a ferromagnetic steel pillar, and six electromagnets. The reflector is attached on top of the pillar by magnetic force; the reflector is translationally-fixed but free in rotational motion. The electromagnets are arranged in a circular pattern under the reflector. Applying current pulses to the electromagnets subsequently, the reflector is rotated by the electromagnetic force. The maximum rotational speed of 85 rps (revolutions per second) was achieved with an elliptical reflector (major axis: 22 mm, minor axis: 18.2 mm, thickness: 0.2 mm) and a permanent magnet (diameter: 4 mm, thickness: 2 mm) at an applied current 28 mA to the electromagnets. We successfully demonstrated 2D laser scan with the horizontal scanning angles of 360 degrees, the vertical scanning angle of 18 degrees, and the rotational speed of 70 rps.
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