| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that, in an electrostatic capacity coupling type coordinate detection device using a system in which an AC signal of 100 KHz or higher is applied to a tablet, and the signal is detected by a coordinate indication pen connected by a wired cable, a noise enters from a shield case of the coordinate indication pen by a synthetic impedance of the wired cable, to thereby exert a bad influence on coordinate detection accuracy.SOLUTION: There is provided an electrostatic capacity coupling type coordinate detection device using a wire-connected coordinate indication pen forming a series resonant circuit by inserting a capacitor of 0.01 μF-1 μF between a power source of the coordinate indication pen and a circuit ground corresponding to a frequency with which an AC signal is applied to a tablet and an inductance component ωL of a cable. |
