Patent ID: 7687001

Claim:
A method of manufacturing an annular speaker edge member in which an inner edge portion of the edge member is connected with a speaker diaphragm, an outer edge portion thereof, which becomes gradually smaller in thickness from an outer side, is formed to face inwardly from an outer periphery of the edge member and is attached to an attachment surface formed on an inner side of an outer periphery edge of a speaker frame, wherein an outer periphery surface of said outer edge portion projects outwardly beyond said outer periphery of the edge member and engages with the outer periphery edge of the speaker frame, wherein a generally edge member-shaped substrate is buried within an edge member formation material, wherein an edge member molding die has at least a first die, a second die, and a third die, as well as an annular cavity formed corresponding to a shape of the speaker edge member when the molding die is closed, while a dividing line is formed by virtue of dividing interfaces of the first die and the second die, along a circumferential direction of the annular cavity in a generally central portion of its outer periphery surface, wherein the third die is positioned on an inner side of said cavity, said method comprises the steps of: attaching said substrate into said edge member molding die; introducing the edge member formation material into said edge member molding die before or after attaching said substrate into said edge member molding die; and applying a heating/pressurizing treatment to said substrate and said edge member formation material within the edge member molding die so as to form said edge member, wherein said substrate is disposed within the edge member molding die in a manner such that an inner edge portion of the substrate is located between the second die and the third die, while an outer edge portion of the substrate is located between the first die and the third die, the outer edge portion of the substrate being in a position which is higher than said dividing line within said cavity.