Capacitive stylus pen

静电方式输入笔

Abstract

本发明涉及静电方式输入笔,本发明是一种具备以轻量且小型的电池或电容器作为电源的静电方式输入笔,能由数位板正确且稳定地求出指示位置及笔压等信息,通过与数位板的电容耦合来输入指示位置,其具备:信号产生电路,生成与从设置于位置指示部的电极发送的信号的频率相同的信号;变压器,通过在磁体缠绕初级绕组与次级绕组形成,用于使由该信号产生电路生成的信号升压;模拟开关,用于控制该变压器的次级绕组的一端与所述电极的连接为开状态或关状态;电源提取电路,提取通过由所述变压器的次级绕组所感应的电动势提供给所述模拟开关的电源;电容器,与所述变压器的次级绕组的其他端连接,插入该电容器以使该其他端为交流的固定电位。
The present invention relates to a capacitive stylus pen. The present invention provides a capacitive stylus pen which includes a light-weight, small-size battery or capacitor as a power supply and which allows a tablet to obtain information on an indicated position, a writing pressure, and so forth, accurately and reliably. The capacitive stylus pen inputs an indicated position to a tablet by capacitive coupling. The capacitive stylus pen includes a signal generating circuit that generates a signal having the same frequency as a frequency of a signal to be transmitted from an electrode; a transformer that boosts the generated signal and that includes a primary winding and a secondary winding that are wound around a magnetic body; an analog switch for controlling connection between one end of the secondary winding of the transformer and the electrode to an on-state or an off-state; a power extracting circuit configured to extract power to be supplied to the analog switch from an electromotive force induced in the secondary winding; and a capacitor coupled to another end of the secondary winding and configured to set another end to a fixed potential in an alternating-current manner.

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