| 摘要 |
Provided is a piezoelectric film laminate that is only made to generate charge by the displacement of the surface of an object of detection in the direction of a normal to the surface of the object of detection and for which charge generation resulting from displacement in a planar direction of the surface of the object of detection is unlikely to occur. In a biological sensor (100), even if the displacement in a planar direction (width direction or depth direction) of skin (901) at a sensor element (10) attachment location causes a film (3) and a film (4) to expand or contract more than a film (1) and a film (2), because the charge directions of film (3) and film (4) are opposite from each other and the charge directions of film (1) and film (2) are opposite from each other, the potential difference between a signal electrode (6) and reference potential electrode (7) is small, and it is possible to avoid mistakenly detecting expansion or contraction along a planar direction of the surface of the skin (901) as rising or falling of the surface of the skin (901). |
