Patent ID: 8459335

Claim:
A heat-dissipating fin of a large area having a fin body, an outer edge of one side of the fin body extending to form a sheet-like expanding portion, wherein the outer edge has a first width, the sheet-like expanding portion connecting at the outer edge has a second width, and the second width is smaller than the first width so that a protrusion is formed at each of two corners of the outer edge, the expanding portion being bent and overlapped on the fin body, wherein the expanding portion has a first extending section, a curved section is integrally connected between the fin body and the first extending section, and a gap is formed between the fin body and the first extending section, wherein the expanding portion further extends from a distal edge of the first extending section to form a perforated section, and the perforated section is adhered to the fin body, and wherein the expanding portion further extends from a distal edge of the perforated section to form a second extending section, the second extending section is inclined upwards from the fin body.