In a sensor sheet, first electrodes (11) each covered with a pressure-sensitive resistive member and second electrodes (21) each covered with a pressure-sensitive resistive member are disposed to extend perpendicularly to each other in a plan view. A core member (40) made of a hard material is disposed...http://www.google.com/patents/US7509884?utm_source=gb-gplus-sharePatent US7509884 - Sensor sheet
