Patent ID: 8994928
Filing Date: 2015-03-31
Classification: G01S,G02B

Abstract:
1. A laser radar device mounted on a vehicle, comprising: a first laser emission part configured to generate a measuring laser beam by using a laser beam emitted from a laser source and to illuminate a predetermined area in a front traveling direction; and a second laser emission part configured to generate a measuring laser beam by using the laser beam emitted from the laser source and to illuminate a predetermined area on a road surface; a road-surface beam spread angle, viewed from a side of the vehicle, of the measuring laser beam generated by the second laser emission part is vertically larger than a front beam spread angle, viewed from a side of the vehicle, of the measuring laser beam generated by the first laser emission part, a number of irradiations per unit time by the laser radar device is a sum of a number of irradiations per unit time by the first laser emission part and a number of irradiations per unit time by the second laser emission part, the number of irradiations per unit time by the laser radar device allocated to the first laser emission part for the first laser emission part to illuminate the predetermined area in the front traveling direction increases with an increase in the road-surface beam spread angle, and an illuminated area per unit time by the second laser emission part adopting a predetermined scan-line number is larger than or equal to an illuminated area per unit time by the second laser emission part which generates a measuring laser beam having a road-surface beam spread angle which is vertically equal to the front beam spread angle and adopts a scan-line number which is larger than the predetermined scan-line number.