A digitizer for use as an input device for a computer system is provided. The digitizer is of the passive type, having a coordinate board for use as an input board which does not include any power sources or active circuit elements. In the coordinate board there is configured a plurality of resonant...http://www.google.fr/patents/US5693914?utm_source=gb-gplus-shareBrevet US5693914 - Digitizer and method of detecting positions
