| 摘要 |
<P>PROBLEM TO BE SOLVED: To stabilize switch operation, and enhance detection accuracy of key operation. <P>SOLUTION: The switch body SW is configured such that an elastic swollen portion 22 driven with a key 10 is upward swollen like a dome from a base portion 21 mounted on a substrate 12. Fixed contact portions 17A, 17B and 17C constituted of a pair of comb-shaped electrodes are arranged on the upper face of the substrate 12. The fixed contact portions 17A, 17B and 17C oppose to three movable contact portions 25A, 25B and 25C, respectively. In a non-key-pressing state, projection heights of the movable contact portions for the substrate 12 side are in the order of the movable contact portions 25A, 25B and 25C with the highest one first. In other words, the order of turning on in a key-pressing stroke is determined, and the order is the movable contact portions 25A, 25B and 25C with the earliest one first. As for the relation of positions in a longitudinal direction, the movable contact portion 25B is arranged at a position between the movable contact portion A and the movable contact portion C, which become turned on earlier than the movable contact portion 25B. <P>COPYRIGHT: (C)2012,JPO&INPIT |
