the coverage of the insulating pad 231 b covers the interlaced area of the y axially symmetrical array 212 a and the c type conductive path 231 a to isolate an electrical connection between the array 212 a symmetrical to y axis and the c type conductive path 231 a the length of the c type conductive path is cross the gap of the two x axially adjacent dot arrays 212 b such that the two dot arrays are electrically conducted via the c type conductive path 231 a the conductive bridges 231 are disposed along the x axis such that several arrays symmetrical to x axis are formed by the dot arrays 212 b meanwhile the arrays symmetrical to x axis have extended members at the end electrically coupled to the upper joint members 211 b of the right side edge the conductive film is also electrically coupled to the lower joint members 221 on the edges around the surface when the resistance responding signals are generated a voltage v is applied between the left side of the lower joint members 221 a and the right side of the lower joint members 221 b as shown in fig5 a in case that the upper conductive layer recesses by pressing the upper sensor members 212 a 212 b around the touch point a 1 and the conductive bridges 231 are electrically conducted to the conductive film 223 the x component of the touch point a 1 is calculated according to the relation between the resistances of the upper sensor members as well as the conductive film and the distance and the measuring results of.