Patent ID: 6590770
Filing Date: 2003-07-08
Classification: F28F,H01L

Abstract:
An improvement in a heat sink device for cooling an electronic component having a surface that rejects heat, the heat sink device comprising a plate having first and second surfaces, the first surface configured to receive a heat rejected from the surface of the electronic component, and a fan spaced above the second surface to direct an airflow towards the second surface substantially perpendicular to the second surface; the improvement comprising:a serpentine fin underlying the fan and bonded to the second surface, the fin formed from a folded sheet of material having a thickness t, the fin comprising a plurality of sidewalls extending substantially perpendicular to the second surface and joined to each other by bends formed in the sheet, spaced slits in each of the sidewalls extending substantially perpendicular to the second surface, each sidewall having a plurality of offset sidewall portions with each offset sidewall portion in the sidewall having a width W extending between a pair of the spaced slits in the sidewall and being offset from any adjacent offset sidewall portion in the sidewall by a gap G, each of the offset sidewall portions having a length L perpendicular to the gap G, the ratio of L/G being in the range of 23 to 100.