| 摘要 |
PURPOSE:To detect the position where the pressure is applied on a pressure-sensitive sheet by providing the sheet consisting of a pressure-sensitive resistor which varies its resistance value with application of pressure. CONSTITUTION:The resistance value of a pressure-sensitive sheet 11 is reduced since a rubber piece 32 to which the external pressure is applied has the elastic deformation and therefore metallic particles 31 attached on the surface of each piece 32 are adhered close to each other. Then the pressure is applied onto the sheet 11 with a position designating pen 16 via a protecting film 15 and a resistance film 13, and a conduction film 12 and the film 13 conduct at the pressure applied point. Under such conditions, a changeover switch 17 is changed toward an electrode 14A. Then the resistance value between the film 12 and the electrode 14A is first detected by a detector 18. The positions designated by the pen 16 are distributed on a curved line on the sheet 11, and a specific curved line on which the designated position exists can be decided by detecting the resistance value. Then the switch 17 is changed toward an electrode 14B, and the resistance value. Then the switch 17 is changed toward an electrode 14B, and the resistance value between the film 12 and the electrode 14B is detected by the detector 18. Thus the position designated by the pen 16 can be decided in the same way. |
