Patent ID: 9188674
Filing Date: 2015-11-17
Classification: G01S

Abstract:
1. A laser radar device comprising: a modulated light beam generator including plural light-emitting elements to emit light beams to a detection target, each light-emitting element including a light source configured to output light in a vertical direction and a coupling lens disposed to receive the light output by the light source in the vertical direction and condense the received light into a light beam of a corresponding emission angle relative to the vertical direction; a photodetector configured to receive reflected light which is reflected by the detection target, when the light beams emitted by the modulated light beam generator irradiate the detection target; a reflected light condenser configured to condense the reflected light and configured to guide the reflected light to the photodetector; a rotator configured to rotate around a rotation axis; and mirrors configured to scan the light beams in a horizontal direction, and configured to guide the reflected light to the reflected light condenser, the mirrors being included in the rotator; wherein the vertical direction of the light output by the light source, the horizontal direction in which the light beams are scanned by the mirrors, and the rotation axis of the rotator are mutually perpendicular to each other; wherein an angular detection range in the vertical direction relative to a direction in which the light beams are emitted is divided into a plurality of layers, wherein the mirrors include corresponding mirror surfaces, wherein the mirror surfaces are tilted by corresponding tilt angles relative to the rotation axis, the tilt angles being different from each other, wherein the modulated light beam generator emits two or more light beams having respective different emission angles relative to the vertical direction, and wherein a difference between the emission angles corresponds to the angular detection range of one layer in the vertical direction, and wherein the light beams are reflected by the mirrors prior to irradiating the detection target, and the reflected light is reflected by the mirrors prior to being received by the photodetector.