Patent ID: 7316289

Claim:
An electro-acoustic transducer comprising: a tone generator including a diaphragm, and a voice coil joined to the diaphragm; a vibrator including a magnetic circuit having a magnetic gap at which the voice coil is positioned, a suspension made of metal and having a first end joined to the magnetic circuit to suspend the magnetic circuit for allowing the magnetic circuit to vibrate; and a case joined to a periphery of the diaphragm, the case including a metal plate joined to a second end of the suspension; wherein the case includes a first case joined to the periphery of the diaphragm, and a second case mounted to the first case and having the metal plate, wherein the second end of the suspension and the metal plate are joined together by laser welding, wherein the metal plate of the case includes a shoulder facing inside of the case, wherein the second end of the suspension is joined to the shoulder, and wherein the shoulder has a corner closer to an inside of the case than a position at which the second end of the suspension is joined to the shoulder, the corner of the shoulder having a radius of curvature.