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.

Abstract: A heat sink device for use in desktop electronic devices comprises a heat sink which can be firmly attached to a CPU assembly with extremely great strength. The holes to be formed in the CPU circuit board of the CPU assembly or the heat sink can be made as small as possible to ensure a great advantage in design. Fastening members, connecting pins or like fasteners used are unlikely to project beyond the outer surface of the CPU assembly to ensure compactness. Furthermore, the heat sink device achieves a high radiation efficiency and is less costly to manufacture.

Abstract: A plate fin heat exchanger having a first flow channel and a second flow channel which are formed by at least three flat plates arranged in parallel with one another at a predetermined spacing and opposed side walls provided between the adjacent flat plates. A platelike wall interconnecting the side walls is provided within at least one of the first and second flow channels and has a multiplicity of projections arched when seen from one side and formed by cutting the interconnecting wall and being projected upward and downward. Each of the arched projections is opposed to a fluid passage.