Patent ID: 7474387
Filing Date: 2009-01-06
Classification: G01C

Abstract:
1. A coordinate position measuring method for measuring coordinate position of an object to be measured based on measurement result by measuring a distance to the object to be measured by receiving a reflected light from the object to be measured, comprising a step of projecting a pulsed laser beam with a predetermined spreading angle from each of two or more known positions in such a manner that the pulsed laser beams cross each other so that two or more objects to be measured are commonly included, a step of receiving respectively by each of said distance measuring devices the reflected lights from the two or more objects to be measured by a photodetection unit via the same optical path for each pulse of the pulsed laser beam; a step of discriminating and detecting the reflected light from one of said two or more objects to be measured; a step of discriminating and detecting the reflected lights from said two or more objects to be measured respectively; a step of measuring distances to said two or more objects to be measured respectively based on the results of detection of the discriminated reflected lights; a step of discriminating two or more measurement results for one of said two or more objects to be measured; a step of measuring the coordinate position of said one of said two or more objects to be measured based on the measured distance obtained by discrimination; and a step of measuring respectively coordinate positions of said two or more objects to be measured.