Hitachi, Ltd.

Yoshihiro Kondou

Akira Yamagiwa

Hitoshi Matsushima

Toshio Hatada

Takao Ohba

Susumu Iwai

Tadakatsu Nakajima

Shigeo Ohashi

Hiroshi Inoue

Kanji Otsuka

Yuji Shirai

Hiroshi Inouye

Toshiki Iino

Kazuo Morita

Hidetada Fukunaka

Toshihiro Komatsu

Masayoshi Miyazaki

Toshihiro Komatu

Tetsuro Honma

Shoohei Fuse

A semiconductor device provided with a first cooling fan and heat-radiating fins is mounted on a board, and there is provided a second cooling fan for supplying cooling air to the board, such that a flow passage is formed for directing the cooling air, supplied from the second cooling fan, toward the board through the first cooling fan.

Air cooled electronic equipment apparatus

A cooling apparatus for electronic equipment for improving the reliability of the equipment by making uniform the temperature distribution of heat generating devices mounted on the electronic equipment, more particularly on a computer and for reducing the working process required at the time of performing a maintenance of a printed circuit board in the electronic equipment by stacking, in a frame, the electronic printed circuit boards on which the heat generating devices, such as a CPU and memories, are mounted at predetermined intervals. The cooling apparatus has a fan fastened to one wall surface of a chamber and a plurality of jet cooling devices formed on the surface opposing the wall surface. The jet cooling devices are formed in parallel to the printed circuit boards. The jet cooling devices are slits, or nozzles or jet stream ducts extending among the printed circuit boards and are so formed as to supply cooling air in a jet stream state to each heat generating device. Therefore, the cooling air can be concentrated to locally cool the printed circuit board including the device that generates heat of a large heating value. Hence, the temperature rise in the heat generating devices can be made uniform.

Jet cooling apparatus for cooling electronic equipment and computer

In a cooling apparatus of an electronic equipment, a plurality each of integrated circuit devices and large-scale integrated circuit devices are mounted onto a plurality of substrates, respectively, and a cooling fan supplies cooling air from outside to each of these integrated circuit devices. A duct having a comb-tooth shape suitable for encompassing each substrate and defining flow paths along the substrates introduces the cooling air supplied by the cooling fan to each of the integrated circuit devices. The duct includes a plurality of small holes disposed at positions corresponding to the positions of the integrated circuit devices on the substrates and having open areas corresponding to the heating values of the integrated circuit devices. The small holes flow the cooling air supplied by the cooling fan as jet streams to the integrated circuit devices. This jet stream cooling improves cooling performance and can make uniform the temperature distribution of the integrated circuit devices.

Cooling apparatus of electronic equipment

An LSI cooling apparatus having various structures is used in electronic devices such as computer systems. In particular, the LSI cooling of apparatus is suitable for cooling of LSIs having high heat generating densities. In a cooling apparatus of the present invention, a heat sink is constructed to be small in pressure loss and excellent in cooling performance. This is because the heat sink comprises thin wire fins so set that the Reynold's number may not exceed 40. As a result, LSIs generating a large amount of heat can be cooled. Further, a heat sink having rigidity can be obtained by disposing wide-width wire drawn substances in thin wires or by using supports. Further, a computer comprising LSIs equipped with heat sinks can cope with various cooling air sending methods and it can be cooled with low noises.

LSI cooling apparatus and computer cooling apparatus

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Ibaraki, Japan

Yoshihiro Kondou