HEAT EXCHANGER

PROBLEM TO BE SOLVED: To provide a heat exchanger capable of controlling a volume, weight and cost while miniaturizing a cooling apparatus. SOLUTION: The heat exchanger includes: a flow channel 52 of cooling water formed to meander along the top face of an upper case 4 by a straight part 521 for passing cooling water straightly while being disposed on the top face of an upper case 4 face-bonded with a power module 1 and the interior of the bonded upper case 4 and lower case 5, and a bending part 522 for changing the flow of cooling water from the straight part 521 to the next straight part 521; and a plurality of thin-plate heat radiating fins 3 which are erected from the bottom face of the upper case 4 of the straight part 521 toward the interior of the straight part 521 and increase a contact area to cooling water by dividing the interior of the straight part 521 to a plurality of flows of the same direction, wherein the bending part 522 has a downward turn part 523 for expanding the flow channel to the opposite direction of the heat radiating face. COPYRIGHT: (C)2009,JPO&INPIT