| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a device for accurately detecting key operation speed with a simple configuration. <P>SOLUTION: While a plurality of alternating signals, each having a different phase from each other, are supplied to transmission electrodes 109A and 109B, capacitance between reception electrodes 111A and 111B and the transmission electrodes 109A and 109B is changed by keying operation, and the phases of the alternating signals induced in the reception electrodes 111A and 111B are compared and discriminated. <P>COPYRIGHT: (C)2011,JPO&INPIT |
