Patent ID: 6895026

Claim:
A heat sink comprising: a first planar member having a first main face and second main face, the second main face having a first depressed portion thereon; a second planar member having a first main face and a second main face, the first main face having a second depressed portion thereof; a partition member sandwiched between the second main face of the first planar member and the first main face of the second planar member, and formed with a main first face and a main second face, the partition member having a plurality of holes passing through the first and the second main faces thereof, each of the plurality of holes having a substantially flat wall extending from the first main face of the partition member to the second main face of the partition member, the first main face of the partition member and the first depressed portion defining a first space having side walls, at least two of the side walls of the first space forming an intersection at a location proximate the plurality of holes, wherein the intersection of the side walls of the first space is rounded, the second main face of the partition member and the second depressed portion defining a second space having side walls, at least two of the side walls of the second space forming an intersection at a location proximate the plurality of holes, wherein the intersection of the side walls of the second space is rounded, the holes communicating the first space with the second space with areas in the first space which correspond to the holes being substantially spatially continuous and free of any dividing members; a supply port for supplying a fluid into the second space; a discharge port for discharging the fluid from the first space; and a first guide member provided in the second space for controlling flow of the fluid in the second space from the supply port to an area in the first space corresponding to the holes.