Patent ID: 7176907
Filing Date: 2007-02-13
Classification: G06F

Abstract:
1. A signal transmitting method for a pointer system of a digitizer tablet device, which comprises a digitizer tablet and a wireless pointer device, said digitizer tablet having a plurality of electromagnetic inductive loops arranged in order, said wireless pointer device having an energy-storing resonant circuit, said method comprising the following steps: (A) emitting a first signal from an m (B) receiving said resonant signal by an (m−n) (C) progressively increasing a value of (m−n) and repeating steps (A) and (B) until the (m−n+i) (D) changing the frequency of the resonant signal emitted by the wireless pointer device by changing a variable inductance and capacitance such that the frequency of the resonant signal increases when the tip of the wireless pointer device is pressed against the digitizer tablet device, and decreases when the key switch on the wireless pointer device is pressed; and, (E) calculating a coordinate position on the digitizer table of the wireless pointer device according to the frequencies of the resonant signals received by the (m−n)