Digitizing device

摘要

A digitizer for determining the relative position of a target in a two- or three-dimensional working environment by measurement of the time taken for a number of light beams to sweep across the environment between known reference points and comparing that time with the time for the beams to sweep from one of the reference points to the target. The light beams are reflected from a light source across the environment by one or more rotating reflectors and the target is marked by a detection pen which is responsive to light of the beam incident on the pen tip.