PIEZOELECTRIC SENSOR AND PORTABLE TERMINAL

摘要

This piezoelectric sensor is provided with a glass plate (12), a piezoelectric film (21) and a bonding layer (22). The glass plate (12) warps when pressed down. The piezoelectric film (21) is bonded to the glass plate (12). The bonding layer (22) is arranged between the glass plate (12) and the piezoelectric film (21). The glass plate (12), the piezoelectric film (21) and the bonding layer (22) are arranged in layers. The bonding layer (22) has an elastic modulus that has a lower temperature dependence within the service temperature range than outside the service temperature range.