ELECTROSTATIC INDUCTION TYPE MECHANICAL-ELECTRICAL CONVERSION ELEMENT

摘要

Disclosed is an electret which comprises a first region and a second region. The polarization direction of the first region along the thickness direction is in a first direction. The polarization direction of the second region along the thickness direction is in a second direction that is opposite to the first direction. The first region and the second region are provided adjacent to each other in a main surface direction that is parallel to a main surface, which is a surface perpendicular to the thickness direction.