Patent ID: 7822216

Claim:
An apparatus for making an electroacoustic transducer comprising: an electroacoustic transducer including, 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; a gas supplying device connected to a port of the cup chamber; a pressure sensor configured to measure pressure within the cup chamber; and a controller configured to control the gas supplying device to supply gas into the cup chamber and to stop supplying gas when the pressure sensor senses that a difference in pressure between the cup chamber and ambient pressure is a maximum pressure difference.