Patent ID: 7358964
Filing Date: 2008-04-15
Classification: G06F

Abstract:
1. A method for finding the coordinates of an electromagnetic inductive system with battery-less pointer device and a multi-induction loop layout having a plurality of physical inductive loops, said method comprising: proceeding a full scan procedure through said plurality of physical inductive loops to transmit a first electromagnetic signal; inducing said first electromagnetic signal and transmitting a second electromagnetic signal through a battery-less pointer device for the convenience of part of said plurality of physical inductive loops located on said battery-less pointer device to receive said second electromagnetic signal; transmitting said second electromagnetic signal to a microprocessor sub-circuit; searching an address of said physical inductive loop having maximum amplitude signal through an inductive loop deployment table in said microprocessor sub-circuit; proceeding a partial scan procedure with said physical inductive loop as the center, and scanning through at least three physical inductive loops, and obtaining at least three voltage signals; and identifying a logical address of said battery-less pointer device through said three voltage signals and said inductive loop deployment table; whereby coordinates of said battery-less pointer device on said multi-induction loop layout are generated.