Abstract: A heat sink for CPUs for use in personal computers comprises a radiating base plate of metal having on one surface thereof a flat portion for receiving the heat generated by the CPU, and a plurality of raised radiating fins integrally formed by cutting on the other surface of the radiating base plate. The heat sink can be provided with a greater number of radiating fins than a conventional heat sink of comparable base plate size, hence an increased radiating area is obtained.

Abstract: A heat sink for CPUs for use in personal computers comprises a radiating base plate of metal having on one surface thereof a flat portion for receiving the heat generated by the CPU, and a plurality of radiating fins formed in a raised shape on the other surface of the radiating base plate integrally therewith by cutting. The heat sink is 3 to 8 mm in the thickness of the radiating base plate, 20 to 50 mm in the height of the radiating fins from the base ends of the fins to the outer ends thereof, 0.2 to 0.7 mm in the thickness of the radiating fins, 1.5 to 4 mm in the fin pitch of the radiating fins, and 6 to 62 in the ratio of the height of the radiating fins from the base ends to the outer ends to the spacing between the radiating fins adjacent to one another. When equipped with a cooling fan, the heat sink is 3 to 8 mm in the thickness of the radiating base plate, 15 to 35 mm in the height of the radiating fins from the base ends of the fins to the outer ends thereof, 0.2 to 0.