Patent ID: 7085394
Filing Date: 2006-08-01
Classification: H04R

Abstract:
1. An electro-acoustic transducer comprising: a diaphragm; a housing comprising an upper case and a lower case and which supports a peripheral surface of said diaphragm within said upper and lower cases; a sole first magnet disposed on said upper case so as to face a surface of said diaphragm; a sole second magnet disposed on said lower case so as to face another surface of said diaphragm; and a drive coil which is provided in contact with said diaphragm so as to be coaxial with said first and second magnets and which is positioned so that a line parallel to a center axis of said drive coil which contacts a peripheral surface of one surface of said first magnet and a peripheral surface of said second magnet, passes through said drive coil, wherein said diaphragm is disposed between said first and second magnets; and said first and second magnets are magnetized in directions that are opposite to each other and so that magnetic flux extends through each of said first and second magnets in a direction parallel to a direction in which said diaphragm vibrates.