Patent ID: 7273094

Claim:
A cooling fin unit, comprising: a plurality of cooling fins being stacked to each other as a unit, each of the cooling fins at least providing a through hole penetrating a main body thereof with a folded circular edge extending outward from the circumference of the through hole; and a heat guide pipe providing an outer diameter less than an inner diameter of the through hole and passing through the through hole respectively; characterized in that at least a local recess part is provided at the main body to make a dent from a facial side of the main body to another facial side of the main body near the circumference of the through hole such that a receiving space is formed to communicate with the through hole and a heat conductive medium is received in the receiving space for joining the cooling fins to the heat guide pipe firmly by way of the heat conductive medium being heated up to a melting state to spread allover a clearance between the through hole and heat guide pipe and then solidifying afterward.