MIRROR UNIT, DISTANCE MEASURING DEVICE, AND LASER RADAR, AND MOBILE BODY AND FIXED OBJECT HAVING THESE

摘要

Provided are: a mirror unit with which maintenance costs are kept down, which is low cost and excels in versatility, and which has good accuracy; a distance measuring device; a laser radar; and a mobile body and a fixed object having these. The mirror unit is provided with a plurality of pairs of a first reflective surface and a second reflective surface which are inclined with respect to an axis of rotation and which extend in directions that mutually intersect, and the mirror unit rotates around the axis of rotation. The mirror unit is configured so that beams of light emitted from a light source are reflected by the first reflective surface of the mirror unit and then reflected by the second reflective surface which forms a pair with the first reflective surface, and in accordance with the rotation of the mirror unit, the beams of light are projected onto and made to scan an object. The mirror unit includes at least a first reflective member that forms the first reflective surface and a second reflective member that forms the second reflective surface. Due to the combination of the first reflective member and the second reflective member, the emission angle of the beams of light emitted from the mirror unit can be selected.