Patent Document ID: 9864062
Application ID: 14426736
Patent Status: 1

Claim One:
1. A laser tracker for determining the position and/or orientation of an auxiliary measurement object including reference features attached in a defined spatial relationship and for continuously tracking the auxiliary measurement object, the laser tracker comprising: a base defining a vertical axis; a support that is swivelable relative to the base about the vertical axis in a motor-driven manner; a swiveling unit rotatable relative to the support about a tilt axis in a motor-driven manner and comprising at least two optical assemblies and an image acquisition unit, wherein the optical assemblies are displaceable along an optical axis of the swiveling unit and a magnification factor for an acquisition of an image by means of the image acquisition unit is defined by a respective current positioning of the optical assemblies; a beam source for emitting a laser beam; a distance measuring unit for measuring the distance to the auxiliary measurement object by means of the laser beam; an angle measuring functionality for determining an emission direction of the laser beam relative to the base; a control and processing unit comprising an object imaging functionality, in which, when said object imaging functionality is carried out, there is controlled positioning of the optical assemblies as a function of a currently triggered measurement to the auxiliary measurement object in such a way that an image for the auxiliary measurement object with a specific image scale is provided on the image acquisition unit for a distance to the auxiliary measurement object determined by the triggered measurement; and an image processing unit for evaluating the image of the imaged reference features such that the spatial orientation of the auxiliary measurement object is determinable therefrom, wherein the object imaging functionality defines at least a normal-distance range and a far-distance range for a distance to the auxiliary measurement object and, when the object imaging functionality is carried out in a manner controlled by the control and processing unit, the magnification factor is set as a function of the distance to the auxiliary measurement object determined by the triggered measurement, wherein a substantially constant normal-image scale is provided for the image for distances within the normal-distance range and a variable far-image scale dependent on the respective distance is provided for the image for each distance within the far-distance range, wherein the far-image scale reduces with increasing distance from the auxiliary measurement object, and wherein the far-image scale respectively provided for the specific distance is taken into account when carrying out the image evaluation if the specific distance within the far-distance range is present.