Scrolling input arrangements are presented including: a flexible membrane; a number of capacitive sensors mechanically integrated with the flexible membrane, the capacitive sensors radially disposed with respect to a first axis that is perpendicular with respect to the flexible membrane; an integrated...http://www.google.de/patents/US20070052044?utm_source=gb-gplus-sharePatent US20070052044 - Scrolling input arrangements using capacitive sensors on a flexible membrane
