| 摘要 |
PROBLEM TO BE SOLVED: To provide a pressure detector which is capable of detecting an accurate pressing force even if a temperature is varied within a piezoelectric sheet or a center axis of flexure due to application of a pressing force to the pressure detector exists in the vicinity of or inside the piezoelectric sheet.SOLUTION: The pressure detector includes a first piezoelectric sheet 3a, a second piezoelectric sheet 3b, and detection electrodes 4 between which the first piezoelectric sheet 3a and the second piezoelectric sheet 3b are interposed. The first piezoelectric sheet 3a and the second piezoelectric sheet 3b are made of materials of the same characteristics and have thicknesses of 5 to 50 μm and are configured so that, when the first piezoelectric sheet 3a and the second piezoelectric sheet 3b are pulled in an in-plane direction, a ratio of potential differences generated between surfaces nearer to a support substrate 1, of the first piezoelectric sheet 3a and the second piezoelectric sheet 3b and surfaces opposite to the support substrate 1 is negative. |
