Patent ID: 7557906
Filing Date: 2009-07-07
Classification: G01S

Abstract:
1. An optoelectronic distance measurement device comprising a lighting unit including a light source and transmitting optics for directing light from the source to an object in a measurement area, a light receiver including light receiving optics and a light detector array, the light receiving optics forming an image of the object in the measurement area on the light detector array, the light detector array generating signals caused by the image of the object, the light transmitting optics including beam forming optics which cause the formation of different types of illumination patterns on the object at different distances from the measurement device, each type of illumination pattern having its own beam cross-section, the beam forming optics including a plurality of spatially separate multi-zone optical elements arranged about a common axis, light emitted from each optical element of the beam forming optics having a beam forming characteristic that generates a different type of illumination pattern from beam forming characteristics of the other multi-zone optical elements, each optical element having a cylindrical lens which has a focal depth and a cylinder axis orientation which differ from the focal lengths and the cylinder axis orientations of the other cylindrical lenses, and the multi-zone optical elements generating line-shaped illumination patterns on the object which have different rotational directions in dependence on the distance of the object from the measurement device, and a signal processor receiving the signals and therewith generating information from the illumination patterns concerning the distance between the object and the distance measurement device.