| 摘要 |
PROBLEM TO BE SOLVED: To provide a tactile switch using a piezoelectric element capable of acquiring a response with the sense of touch corresponding to a switch operation in a simple configuration where any special driving circuit is not installed, and performing a certain and stable switch operation. SOLUTION: A bimorph element 1 is disposed under a key top 2, and distorted and deflected. In this case, the back central part of the bimorph element is supported by a supporting body 3, and the key top bottom face is formed so as to be recessed. When the key top is depressed, the bimorph element is distorted and deflected so as to be fit into the recessed shape, and the back electrode film is brought into contact with holding pieces 5 and 5 so that a ground side can be made conductive. Then, an intermediate electrode layer 10 is brought into contact with a make contact 6, and a circuit for detecting a charge is closed. The distortion and deflection of the bimorph element is limited so that the generated charge quantity can be made constant, and the charge is allowed to circulate through the closed circuit and detected, and the on-state is set. The bimorph develops reaction force to restore the distortion/ deflection by the discharge of the charge, and this reaction force is shockingly transmitted to the key top 2 so that the sense of touch can be realized. COPYRIGHT: (C)2003,JPO
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