| 摘要 |
PROBLEM TO BE SOLVED: To make a pressure sensor using change in capacitance robust to disturbance.SOLUTION: A circular movable electrode 11 and a first divided electrode 15a to a fourth divided electrode 15d, formed on a surface of a circular printed board 14, are opposed to each other via a double-face tape 13, functioning also as a spacer, with slight gaps interposed therebetween. When a pad 10 is struck with a stick 100, the gaps between the movable electrode 11 and the first divided electrodes 15a to the fourth divided electrode 15d change, so that capacitance therebetween changes, and signals are output from the first divided electrode 15a to fourth divided electrode 15d. The first divided electrodes 15a to the fourth divided electrode 15d are sandwiched between the grounded movable electrode 11 and a grounded shielded electrode 16 and thus are not affected by external disturbance. |
