Hitachi, Ltd.

Hitachi Media Electronics Co., Ltd.

Hitachi Maxell, Limited

Hitachi Microcomputer Engineering, Ltd.

Hitachi Plant Technologies, Ltd.

Hitachi Air Conditioning Systems Co., Ltd.

Hitachi, Ltd. for the Benefit of Hitachi Air Conditioning Systems Co. Ltd.

Hitoshi Matsushima

Hiroshi Fukuda

Tadakatsu Nakajima

Yoshihiro Kondo

Yoji Shibata

Masaaki Takizawa

Takehiko Yamada

Atsuo Yoshida

Hirotada Ueda

Shigeo Ohashi

Toshio Hatada

Hiroshi Yoshikawa

Akira Yamagiwa

Yoshimune Hagiwara

Yukinobu Maruyama

Jun Furuya

Susumu Iwai

Toru Ebihara

Takao Ohba

Takafumi Miyatake

Kenji Kaneko

Takayuki Atarashi

Hiroyuki Toyoda

Atsushi Ishibashi

Tsuyoshi Nakagawa

Kiyoshi Ishida

Hiroshi Inouye

Yasushi Neho

Naoyuki Sakamoto

Yukiko Iwama

Yoshito Ohmura

Yoshihiro Kondou

Shunsuke Yamana

Osamu Suzuki

Takeshi Kato

Kanji Otsuka

Motohiro Sato

Kanji Kato

Tetsuya Nakagawa

Heikichi Kuwahara

Akio Idei

Junichi Higashino

Shigeyasu Tsubaki

Takayuki Fujimoto

Junichi Senga

Tomoo Hayashi

Toshihiro Komatsu

Ichirou Asano

Haruo Yoda

Tatsuya Saito

Hiroshi Yamada

Takehisa Hayashi

Kouki Noguchi

Hiroshi Inoue

Kenji Ogiro

Shigeru Shimada

Satoshi Yoshizawa

Atsushi Kiuchi

Seiichi Katou

Takashi Naganawa

Rintaro Minamitani

Shinji Matsushita

Hiroshi Ito

Seiji Kashioka

Kenta Kumagai

Yuji Shirai

Mitsuru Akizawa

Kazuyuki Kodama

Yoko Shiga

Hiroshi Sakou

Yasuhiro Kashirajima

Shinichi Shimode

Toshiki Iino

Takumi Sugiura

Mari Uchida

Kenji Fujita

Yuuji Shirai

Akiyoshi Iida

Kazuo Morita

Jun Ishida

Tomoru Sato

Tsunenori Takeuchi

Takehiro Hayama

Mitsugu Aoyama

Mitsuru Honma

Kenji Keneko

Yasumasa Nagawa

Akiko Sugihara

Toshihiro Komatu

Tetsuro Honma

Shingeo Ohashi

Hiroshi Tsuzaki

Kenji Onishi

Shouhei Fuse

Tetsuro Homma

Shigeko Ohtani

An optical pickup, having an optical pickup housing made of resin, for maintaining the heat radiation performance or capacity of a semiconductor laser, also an objective lens driving mechanism, and further a driver IC for the semiconductor laser, while keeping small-size and light-weight thereof, comprises a pickup housing, in which an optical part and a semiconductor laser are fixed; an objective lens, which is attached within the pickup housing; and an objective lens driving mechanism, which is configured to drive the objective lens, further comprising: a metal-made bottom cover, which is configured to cover a lower surface of the pickup housing and a side surface of an inner periphery of an optical disc, wherein the metal-made bottom cover and the semiconductor laser are thermally connected with each other.

Optical pickup

An electronic apparatus, such as a blade server or the like, has a cooling system for efficiently cooling a plurality of heat generating semiconductor devices, such as a CPU, mounted on blades which is freely put on and taken off. The cooling system includes a thermosiphon which transfers heat from devices having relatively high heat generation, such as CPU or the like, to the outside of the apparatus, heat pipes which transfer heat of devices having relatively low heat generation to the thermosiphon, a thermal highway which is thermally coupled to the thermosiphon by the mounting of blades into a housing and collects and transfers the heat from the thermosiphon and the heat pipes, and a condenser which transfers the heat collected and transferred by the thermal highway outside a housing.

Electronic apparatus

The present invention relates to a system and method for controlling air conditioning facilities, and a system and method for power management of a computer room. In an air-conditioning facility control system of a computer room (cooling room) equipped with air-conditioning facilities for air-cooling the computer room in which a large number of information processing units are installed, an air-conditioner monitoring and controlling unit calculates a temperature sensitivity coefficient of each information processing unit, and that of each air conditioner, and then determines discharge air temperature of each air conditioner by use of the temperature sensitivity coefficients in such a manner that the sum of squares of a deviation of a change in discharge air temperature of each information processing unit becomes the smallest, and in such a manner that the sum total of the power consumption of the individual air conditioners becomes the smallest.

System and method for controlling air conditioning facilities, and system and method for power management of computer room

Temperature variation among electronic apparatuses installed in the data center is reduced, enhancement in reliability of the electronic apparatuses, and increase in service life are achieved, and efficient cooling of an electronic apparatus group is realized. Further, an electronic apparatus with low noise is provided. A front cover is provided on a front surface of an electronic apparatus, and a back cover is provided on a rear surface of it. A supplied air opening is formed at a lower side of the front cover, and an exhaust air opening is formed at an upper side of the back cover. The supplied air opening is connected to a blowing in opening from below the floor level, and the exhaust air opening is connected to a ceiling air duct. The ceiling air duct is provided with a heat exchanger, and indirect heat exchange is performed with external air.

Cooling systems and electronic apparatus

An optical pickup devicecomprising a laser diode, a photo detector, a housinghaving an optical system for guiding light from the laser diodeto an optical disk and guiding light reflected on the optical disk to the photo detector, a wiringto supply current to the laser diode, and a metallic coverprovided outside of the housing, wherein

Optical pickup device with heat radiating structure

Provided is a disk array device or an electronic device having an enhanced cooling performance with lower noises. The disk array device has doors in the front side and in the rear side of the device, each of the doors is formed with outside openings which are louver-like or bend-like, the louver- or bend-like openings in the doors being directed in directions which are opposite to each other between the door on the suction side and the door on the exhaust side.

Disk array device and electronic device

A disk array apparatus including a rack-shaped basic frame, and a plurality of disk boxes that can be inserted into and pulled out of the basic frame depth-wise. Each disk box has: disk drive connectors for connecting a plurality of disk drives arranged in a matrix on a platter substrate, which is the bottom face of the disk box, roughly parallel to the depth direction of the basic frame; and a cooling module for cooling the disk drives. The disk box is a hermetically sealed structure.

Disk array apparatus

It is an object to provide a cooling device for optimally cooling a semiconductor device on a CPU blade which is detachable with respect to an electronic apparatus using the cooling device with compact structure for reducing power consumption. A cooling device for cooling a semiconductor device disposed on an electronic circuit substrate in a casing of an electronic apparatus, comprising a first cooling unit comprising a first heat absorbing portion and a first heat releasing portion, and a second cooling unit comprising a second heat absorbing portion and a second heat releasing portion, wherein the first heat absorbing portion is disposed in contact with the semiconductor device, the second heat absorbing portion is detachably disposed in contact with the first heat releasing portion, a phase-change refrigerant is contained in the first cooling unit, and the second heat releasing portion is disposed outside the casing.

Cooling device and electronic apparatus using the same

In a disk array apparatus, by taking note of a first sound of a specific frequency which is a noise element of original sounds generated from a fan, a second sound whose phase is inverted to that of the first sound is generated by a structure of a cooling air flow path passing through the fan, and the second sound is synthesized with the first sound on the cooling air flow path, thereby reducing the noise. For example, an exhaust duct is located on a fan unit in an upper part of the apparatus, two flow paths extending to an exhaust port are formed in an internal structure of the exhaust duct, and the two flow paths are designed so that the difference in the flow path length therebetween becomes equivalent to half wavelength of the specific frequency.

A disk array apparatus includes a plurality of disk drives arranged in at least one disk drive line in a direction of an airflow, at least one shield plate, a housing containing the disk drives and the at least one shield plate therein, and flow passages arranged between an upper surface of the disk drives and an inner wall of the housing for enabling the airflow to pass through. The at least one shield plate is arranged between at least two of the disk drives of the at least one disk drive line for controlling the airflow on a downstream side of the flow passages.

Disk array apparatus for providing equalized cooling

A disk array system includes a plurality of disk drives and at least one unit box including the plurality of disk drives aligned in the thickness direction of the disk drive, each disk drive including a thin case accommodating a recording disk, a read/write head, and a driving mechanism for driving the recording disk and the read/write head, and a control board for controlling the driving mechanism, the control board being mounted on the thin case. In the disk array system, the thin case and the unit box are composed of a thermally-conductive material, the unit box includes surfaces parallel to the thickness direction of the plurality of disk drives, and at least one of the surfaces has a cold plate filled with a refrigerant. Heat generated at the disk drives is transferred to the cold plate, thereby improving cooling performance.

Disk array system

A liquid cooling apparatus for use in a disk array apparatus which contains a plural number of units having a disk drive inside of a housing and disposed within a rack, including an air-blow fan, a pump for transmitting liquid coolant, a radiator for transmitting heat absorbed into the liquid coolant into outside air, and pipes for connection of the pump and radiator. The liquid cooling apparatus further includes a temperature sensor disposed at a position for detecting temperature of the liquid coolant, which temperature changes in response to electric power consumed within the plural number of disk drives, and a rotation speed of the pump is controlled in dependence upon a detection signal from the temperature sensor.

Disk array apparatus and liquid cooling apparatus thereof

In a disk array apparatus according to an aspect of the invention, temperatures of disk drives arranged in a casing are equalized to reduce a noise. A disk array apparatuscomprises plural disk drives, fans, and a casing. The disk drivesare arranged in an array, the fansare provided on one end side of rows of the disk drives, and the casingaccommodates the disk drivesand the fans. Air which has already cooled the disk drives flows through an air duct. A sub-fanexhausts the air flowing through the air duct to the outside of the casing. A nozzleis arranged in a front end portion of the air duct. One end portion of the nozzleis arranged between the disk drives.

A disk array apparatus comprises a casing, a disk drive group configured by a plurality of disk drives, a controller unit configured by a plurality of circuit substrates, a plurality of cooling fans, and backflow prevention members. The plurality of cooling fans is provided so as to be aligned between the disk drive group and the controller unit in the casing. The backflow prevention members are provided so as to protrude on the side of the disk drive group or on the side of the controller unit from between the cooling fans while extending to define a space on the inlet side or the outlet side of the cooling fans.

Growing community of inventors

Ryugasaki, Japan

Hitoshi Matsushima