Patent ID: 7176907

Claim:
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 th inductive loop on the digitizer tablet, and causing the resonant circuit of the wireless pointer device to emit a resonant signal after resonation and energy storing, wherein m is a positive integer; (B) receiving said resonant signal by an (m−n) th inductive loop on the digitizer tablet, wherein n is an integer; (C) progressively increasing a value of (m−n) and repeating steps (A) and (B) until the (m−n+i) th inductive loop receives said resonant signal, i being a positive integer; (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) th to (m−n+i) th inductive loops on said digitizer tablet.