Polymer piezoelectric film and its manufacturing method, piezoelectric film piece and its manufacturing method, laminate, and piezoelectric element

摘要

To provide a high molecule piezoelectric film capable of improving yield when a piezoelectric film piece is collected, and easily manufacturing a piezoelectric element at good efficiency, when the used as a raw fabric for collecting the piezoelectric film piece.SOLUTION: There is provided a high molecule piezoelectric film containing a helical chiral high molecule (A) having weight average molecular weight of 50,000 to 1,000,000 and optical activity, and having crystallinity index obtained by a DSC method of 20% to 80%, a long sized shape, longer direction length of 10 m or more, a plane view angle θ1 between molecule orientation direction La of the helical chiral high molecule (A) at one end part in a width direction and molecule orientation direction Lb of the helical chiral high molecule (A) at another end part of 70° to 110°, a plane view angle θ2 between the longer direction and the molecule orientation direction La of 35° to 55°, and a plane view angle θ3 between the longer direction and the molecule orientation direction Lb of 35° to 55°.SELECTED DRAWING: Figure 1