Patent ID: 6516077
Filing Date: 2003-02-04
Classification: H04R

Abstract:
An electroacoustic transducer including a diaphragm having an edge, the edge comprising a plurality of divided portions formed at regular intervals in circumferential direction and alternately up-rolled and down-rolled with respect to a vibration plane of the diaphragm, and a plurality of sloped-plane portions respectively for connecting between mutually opposing rims of adjacent ones of the up-rolled and down-rolled divided portions, the sloped-plane portions respectively extending along each of first tangential lines drawn at regular intervals with respect to an inner peripheral line of the edge and transversing the circumferential direction at an angle &agr; in a range defined between second tangential lines drawn from the inner periphery to bulged faces of the respective divided portions and the vibration plane, wherein the divided up-rolled and down-rolled portions being of mutually different curved-shape to provide different stiffness upon up and down movements for cancelling a difference in upward and downward driving force generated in magnetic circuit of the transducer.