Hitachi, Ltd.

Hitachi Chemical Company, Ltd.

Tamotsu Tsukaguchi

Toshiyuki Utsuki

Takashi Yamamoto

Fumio Kishida

Shigeru Koizumi

Takahiro Daikoku

Kenta Kumagai

Yutaka Yonezawa

Toshio Hatada

Fumiyuki Kobayashi

Kenichi Kasai

Mitsuo Miyamoto

Takayuki Atarashi

Toshiki Iino

Toshio Mori

Tohru Higashihara

Yoshito Hayashi

Koushiro Adachi

Hiroshi Takahashi

Tetsuya Tanaka

Minoru Ikeda

Masanori Watanabe

Shinji Shibuya

Yukiji Iwase

Osamu Sekiguchi

Tadahiro Yamaguchi

Shinichi Shimode

Nobuo Kawasaki

Jyun Furuya

Koushirou Adachi

Katsuhiko Nishiwaki

Shiro Fujimori

Katsuo Ohki

Hiroshi Kozai

Kennta Kumagaya

Miyuki Yamaguti

Norifumi Sano

Syouji Umemoto

Kazuyuki Sunaga

Hiroshi Ui

Masahiro Uchida

Motoake Sakamoto

Computer housing

Computer

In an active noise-reduction controlling apparatus, there are provided a reference sensor for outputting a reference signal corresponding to information about a noise source, a noise-reduction error sensor for detecting a noise-reduction condition, an adding acoustic wave source controlled to produce an acoustic wave having the same amplitude as that of an acoustic wave received at the noise-reduction error sensor and having a phase opposite to that of the acoustic wave received as the noise-reduction error sensor; a first adaptive digital filter for processing the reference signal to output a control signal of the adding acoustic wave source, a second adaptive digital filter for setting a predicted value of a transfer function between an input signal of the adding acoustic wave source and an output signal of said noise-reduction error sensor, a filter coefficient controlling unit for optimizing a coefficient of the first adaptive digital filter with employment of the predicted value of the transfer function and the output of the noise-reduction error sensor, and a control unit for correcting the predicted value of the transfer function in accordance with an environmental change.

Method of actively controlling noise, and apparatus thereof

An electronic apparatus having a plurality of semiconductor devices which produce heat during operation, with a heat sink having a plurality of tabular or pin-type fins is provided on each semiconductor device. Nozzles are associated with the heat sinks so as to supply a cooling fluid into the heat sinks. The heat sinks are so arranged that all these heat sinks guide and discharge the cooling fluid in the same direction. A breadth of the respective nozzles, as measured in the direction (x-direction) of the flow and discharge of the cooling fluid determined by the heat sink is less than that of the associated heat sink. A width of the nozzle, as measured in the direction (y-direction) perpendicular to the x-direction is smaller than that of the associated heat sink. A space between adjacent nozzles provide a discharge passage of an ample cross-section which reduces resistance encountered by the heated cooling medium to be discharged therethrough.

Electronic apparatus

An electronic equipment has a cooling structure in which air discharged from heat sinks can be recovered without any leakage and compact blow ducts and discharge ducts are disposed in a narrow space. A supply opening and a discharge opening for cooling air are independently formed in a heat sink. A plurality of supply branched ducts and discharge branched ducts are combined in a comb-like shape along the axis of the ducts. Ejection openings for cooling air are formed on each of the supply branched ducts in positions corresponding to each of the heat sinks. Such ejection openings are closely connected to the supply openings for cooling air of the heat sinks. On the other hand, recovery openings for cooling air are formed on each of the refrigerant discharge ducts in a position corresponding to each of the heat sinks. Such recovery openings are closely connected to the discharge openings for gas refrigerant of the heat sinks.

Cooling apparatus for electronic equipment

In an electronic equipment having an exhaust duct for exhausting air heated in the equipment, and a cable lead-in portion which is disposed adjacent to the exhaust duct and through which external connector cables is to be led, a partition is disposed between the exhaust duct and the cable lead-in portion. The partition is movable so as to vary the area of an exhaust opening of the exhaust duct and the area of a lead-in opening of the cable lead-in portion.

Ventilation guide for electronic equipment

Central processor for an electronic computer

Central processor unit

A power supply construction comprises a logic circuit section housed in a frame, a power supply section mounted rotatably on the frame in opposed to the logic circuit section for supplying power to the logic circuit section. Relay bars with an end arranged in the vicinity of the rotating axis of the power supply section are provided for supplying power to the logic circuit section. Power supply bars with an end arranged in the vicinity of the rotating axis are for outputting the voltages from the power supply section. In addition, a flexible conductor is provided for electrically connecting the relay bar and the power supply bar in such a manner that the power supply section is rotatable.

Power supply structure and system for mounting the same

Growing community of inventors

Hiratsuka, Japan

Tamotsu Tsukaguchi