Piezo-electric type of pressure sensor and pressure-detecting device employing the same

摘要

A piezo-electric type of pressure sensor comprises a plurality of piezo-electric sensor elements arranged in a matrix. Each piezo- electric sensor element comprises a piezo-electric element and a switching transistor connected to the piezo-electric element. The piezo- electric type of pressure sensor comprises control lines provided in for each row of a plurality of piezo-electric sensor elements arranged in matrix, and for controlling the switching transistors and reading lines provided in for each column and whose connections to the piezo-electric elements are switched by means of switching transistors. A piezo-electric element which charge is to be measured selected by a control line is connected to a reading line by means of a switching transistor so that a charge generated in the piezo-electric element is detected. A capacitor is connected across each piezo element for receiving and storing the generated charge. An integrator is also connected to the matrix for accumulating the charge that is currently being read.