| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a two-stage force sensor keyboard having at least one key and a thin film switch circuit positioned below the key. <P>SOLUTION: A thin film switch circuit includes a first connection point, a second connection point, a first isolation layer isolating the first and second connection points, a third connection point, a fourth connection point, and a second isolation layer isolating the third and fourth connection points. Thickness of the second isolation layer is larger than that of the first isolation layer. When a key is pressed by a first pressure, the first connection point contacts the second connection point, so as to generate a first signal. Also, when the key is pressed by a second pressure, the first connection point contacts the second connection point, and the third connection point contacts the fourth connection point, so as to generate a second signal. The larger a proportional value of the thickness of the second isolation layer and the thickness of the first isolation layer is, the more easily a user can identify a difference between the first pressure and the second pressure. <P>COPYRIGHT: (C)2013,JPO&INPIT |
