Piezoelectric polymer film material

Abstract

A film is a film having molecular orientation, wherein the center for the main surface of the film is centered 10mm length measurement range, the measured retardation Re at a wavelength of 550nm at intervals of 0.8mm, the delay difference between the maximum and minimum values ​​of the absolute value of Re ΔRe 100nm or less, and the average retardation Re is Re (ave) is contained within in the range of ~ 700nm ~ 900nm, or 1450nm to 1250nm range.