| 摘要 |
An annular heat dissipating device, comprises an annular body; a periphery of the annular body being formed with a plurality of trenches and recesses; which are alternatively arranged. an inner middle area of the annular body having a seat plate for installing at least one heat source; a plurality of heat dissipated fins being arranged in the recesses which are annularly arranged around an outer periphery of the annular body; each fin being inserted into the recess. In assembly by punching, a shaping mold punches a trench between two fins so that two lateral wall of the trench will be pressed and deform; and then the fin in the recess tightly adheres to the outer periphery of the annular body.
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