| 摘要 |
Provided is a capacitive keyboard that can detect with high accuracy a pressed key and a pressing amount of the pressed key. The capacitive keyboard comprises: a drive circuit 11 that alternately switches the voltages of drive lines M from an L level to a H level; a sensing circuit 12 that is connected to sensing lines N, selects a single sensing line from among the sensing lines N and detects a voltage generated in the selected sensing line; and a control circuit 15. The control circuit 15 is provided with: a storage unit 44 that includes storage areas that correspond to respective keys; a storage control unit 42 that obtains voltages generated in the sensing lines and stores the obtained voltages in storage areas that correspond to the respective keys; and a correction processing unit 43 that corrects a voltage generated due to operation of a - key by using the voltage stored in a storage area corresponding to another key when the - key is operated. As a result, high accuracy detection is possible even in a case where a plurality of keys are pressed simultaneously. |
