Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Electromagnetic
Reexamination Certificate
2006-07-14
2010-11-16
Le, Huyen D (Department: 2614)
Electrical audio signal processing systems and devices
Electro-acoustic audio transducer
Electromagnetic
C381S190000
Reexamination Certificate
active
07835539
ABSTRACT:
An electroacoustic transducer has a cup chamber and a diaphragm made of deformable electrostrictive polymer, which is attached to an opening of the chamber. The electroacoustic transducer also has 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. The first and second adaptive electrode layers have shapes that are adjustable according to a change in a shape of the diaphragm. To form the diaphragm, the electrostrictive polymer that has been previously formed to have a concave or convex shape is further formed to have a concave or convex shape, thereby generating a difference in air pressure between the front surface and the rear surface of the previously formed electrostrictive polymer.
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U.S. Appl. No. 11/482,789, filed Jul. 10, 2006, Ohashi, et al.
Le Huyen D
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
Sony Corporation
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