Hitachi, Ltd.

Mitsuru Honma

Hitoshi Matsushima

Tadakatsu Nakajima

Shigeo Ohashi

Yoshihiro Kondo

Atsuo Nishihara

Noriyuki Ashiwake

Hiroshi Tsuzaki

Kenji Onishi

Toshio Otaguro

It is an object of the invention to provide a cooler of an electronic apparatus capable of keeping semiconductor chips at a low temperature without care of condensation and which is excellent in compactness. To achieve the above object, the present invention proposes an electronic apparatus in which a heating region is built in the multilayered wiring substrate of the semiconductor package or module on the side near to the input/output pins, the semiconductor package or module and the cooler mounted on the package or module are placed in a moisture proof case, a heat insulating material is filled in the gaps between the moisture proof case, semiconductor package or module and cooler, and a heater is provided on the outer periphery of the heat insulating material.

Electronic apparatus

In a portable personal computer in which high-exothermic devices are mounted within a flat case equipped with an input unit, the and in which a surface temperature of the exothermic devices and the input unit is cooled down to or below a predetermined temperature. A first space is created between the back of a keyboard operating section and an electronic circuit board 3, the electronic circuit board 3 is installed so that the face thereof on which the high-exothermic devices are mounted faces away from the back of the keyboard, a second space is created between the electronic circuit board 3 and an electronic circuit board 2, and a fan 4 is installed inside the case so that cooling air flows from the first space to the second space. A flow path for circulating outside air into the case via an air intake hole 8 is constructed on the wall of the input device operating section.

Portable computer with fan moving air from a first space created between

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Ibaraki-ken, Japan

Mitsuru Honma