Patent ID: 7835539
Filing Date: 2010-11-16
Classification: H04R

Abstract:
1. An electroacoustic transducer comprising: a cup chamber; a diaphragm made of deformable electrostrictive polymer, said diaphragm being attached to an opening of the chamber; and first and second adaptive electrode layers formed on a front surface and a rear surface of the diaphragm, across which audio signal voltage biased by a direct-current biased voltage is applied, said first and second adaptive electrode layers having shapes that are adjustable according to a change in a shape of the diaphragm, the diaphragm formed from the electrostrictive polymer having any one of concave and convex shapes, and the diaphragm further formed to have any one of concave and convex shapes thereof by generating a difference in air pressure between the front surface and the rear surface of the previously formed electrostrictive polymer such that has a ratio of a minimum thickness of the diaphragm to a maximum thickness of the diaphragm is not less than 5/7.