Patent ID: 6422307
Filing Date: 2002-07-23
Classification: F28F,H01L

Abstract:
Liquid or air cooled metallic heat sink formed as a unibody structure comprising, a planar base (10) having width (12) and flow length (14), and a plurality of fins (22) protruding at an angle of about 90 degrees from one side of said planar base (10) wherein said fins (22) are in face-to-face parallel arrays across width (12) and said parallel arrays are arranged in series along flow length (14) with intervening gaps (26) between successive parallel fin arrays, wherein the fin density across width (12) is greater than about 12 fins per centimeter, the fin spacing (16) between adjacent fins across width (12) is less than about 0.88 millimeter, the fin height (18) is greater than about 2 millimeters, the fin thickness (20) is less than about 0.15 millimeter, the fin aspect ratio is less than about 0.15, and the fin length (24) is less than about 19 millimeters, and further wherein the arrangement of fins (22) on said planar base (10) defines parallel channels suitable for the laminar flow of a liquid coolant along the flow length (14).