| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a stable touch key without fluctuation in detection sensitivity even when a distance between a panel part and a metallic casing is changed or dispersed. <P>SOLUTION: This touch key includes: the panel part 1; a first electrode part 2 formed on the back face of the panel part 1; an electrode board part 5 having a second electrode part 3 on the side facing to the first electrode part 2 and a third electrode part 4 on a surface opposite to the second electrode part 3; a connection part 6 for electrically connecting the first and second electrode parts 2 and 3 to each other; an oscillation part 7 for applying a voltage of a predetermined frequency to the second electrode part 3; and a detection part 8 for detecting an output voltage of the second electrode part 3; and the third electrode part 4 is connected to earth potential. Thereby, a capacitance value composed of the second electrode part 3, the electrode board part 5 and the third electrode part 4 is constant, whereby the touch key is stable without fluctuation in detection sensitivity. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
