Patent ID: 7480390

Claim:
A loudspeaker comprising: a magnetic circuit; a frame connected to said magnetic circuit; a voice coil that is positioned within a magnetic gap of said magnetic circuit; a diaphragm; an edge member that includes an inner peripheral portion, an arc portion and an outer peripheral portion, said inner peripheral portion of said edge member extending from an outer peripheral portion of said diaphragm to a radially innermost part of said arc portion and said outer peripheral portion of said edge member extending from said frame to a radially outermost part of said arc portion; and wherein said diaphragm includes said outer peripheral portion, which is bonded to said frame via said edge member, and an inner peripheral portion that is bonded to said voice coil, wherein in a sectional view said inner peripheral portion of said edge member and said outer peripheral portion of said edge member are straight, wherein said edge member is a separate member relative to said diaphragm and is bonded thereto, wherein said edge member comprises a foamed layer, the foamed layer being made of a foamed resin that includes both an independent foam and a continuous foam, wherein a thickness of a sectional shape of said inner peripheral portion of said edge member is thinner than a thickness of a sectional shape of said outer peripheral portion of said edge member, and wherein said radially innermost part of said arc portion has a higher density than said radially outermost part of said arc portion.