Hitachi-Lg Data Storage, Inc.

Hitachi, Ltd.

Hitachi Consumer Electronics Co., Ltd.

Hitachi Media Electronics Co., Ltd.

Nippon Paper Industries Co., Ltd.

Takayuki Fujimoto

Yoshiaki Yamauchi

Ikuo Nishida

Makoto Ibe

Nozomu Harada

Hitoshi Matsushima

Shinya Asano

Seiichi Katou

Seiji Hamaie

Masahiro Matsuo

Nobuyuki Isoshima

Hiroyuki Toyoda

Junichi Senga

Takeshi Kato

Yoshihiro Kondo

Kaoru Hamada

Fumio Takeda

Shinya Tsubota

Yoshio Yoshida

Kenji Watabe

Youichi Narui

Yoichi Narui

Shoichi Endo

Yukinobu Abe

Masaya Tosaka

Yuu Suzuki

Takehiro Hayama

Masanori Kawashima

Susumu Hagisawa

The computer having a module board with semiconductor elements mounted on both sides thereof, a motherboard on which a plurality of units of the module board are mounted, and a rack cabinet on which a plurality of units of the motherboard are mounted includes a thermo-siphon that is thermally connected to the semiconductor elements mounted on one side of the module board, a metal plate that is thermally connected to the semiconductor elements mounted on one side of the module board, a thermally-conductive member that transfers the heat of the metal plate to the thermo-siphon in a situation where the heat of the semiconductor elements mounted on one side of the module board is transferred to the metal plate, and a pressing member that presses the thermo-siphon and the metal plate against the semiconductor elements mounted on the module board.

Computer provided with cooling system

A disc drive apparatus comprises: a spindle motorfor hold a discand for rotate it; an optical headfor conducting either one of recording or reproducing of information onto/from the disc; a driver unit for moving the optical head in a radial direction of the disc; and a unit mechanism chassisfor supporting those thereon, fixedly, wherein the spindle motor is constructed with a rotational drive means made of a magnetic circuit, a rotor portion and a rotation shaft, which define a rotation body, and a spindle motor attachment plate to hold those thereon, and the spindle motor attachment plate has a semi-circular shaped plate configuration in a part thereof, nearly fitting to an outer diameter the rotor portion, in a direction where the optical head is provided, and has a step-like structure in thickness direction of the plate thereof, within a semi-circular shaped region with respect to a line connecting between corner portions on both ends of that semi-circular shape, and also bridging over that line.

Spindle motor attachment structure for a disc drive apparatus

An optical disc apparatus, presenting recording quality without degradation by an extreme temperature rise in an objective-lens drive mechanism in an optical pickup, includes a mechanical chassis on which a disc rotation mechanism, an optical pickup, and a transfer mechanism are mounted, a decorative plate that is a plate-shaped member located between the disc and the optical pickup and fixed on the mechanical chassis, a disc tray for loading and removing the disc, a circuit board for operation control, and an apparatus housing containing the components. A recess is formed in an indented shape in a portion of the mechanical chassis facing an outer peripheral region of the disc recording surface. An incline is formed in a position close to an opening of the disc tray for mounting the mechanical chassis and opposite the outer peripheral region of the disc recording surface, and slopes gently down to the recess.

Optical disc apparatus with mechanical chassis having a recess

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

For the purpose of suppressing an increase of temperature of a laser element, in an optical disc drive, even in case when recording/reproducing at such a low double speed that almost no expectation can be made upon the effect of the convection cooling due to circulating flow of an air, which is generated by rotation of a disc, and in particular, the structure for fixing both end portions of a main shaft, which is engaged with a transfer mechanism for moving an optical pickup into the disc radial direction, through the optical pickup, between two (2) pieces of shafts for supporting the optical pickup, one of which forms the main shaft, onto connector portions to be engaged with the both end portions of the main shaft, upon a mechanical chassis, on which is mounted at least a disc rotation mechanism, etc., has structures for enlarging a contacting area defined between the both end portions of the main shaft and the connector portions or pressure plates, each building up the connector portion (for example, a comb-like configuration).

Optical disc drive with main shaft having end portion of particular configuration

An optical disc drive includes a rotation device that rotates an optical disc in a clockwise direction when an upper surface of the optical disc is viewed, a disc mounting portion for mounting of the optical disc thereon has a recess portion, and an optical pickup which irradiates a laser beam on a lower recording surface of the optical disc. The disc mounting portion includes a first penetrating opening portion therethrough that extends from a center area of the recess portion to a periphery of the recess portion. The disc mounting portion further includes a single second penetrating opening portion therethrough being provided at a rear of the disc mounting portion and periphery at an upstream side of the clockwise rotating direction with respect to a center line of the first penetrating opening portion extending from a front to the rear of the disc mounting portion.

Tray enabling optical unit heat reduction

An optical disc apparatus, comprising a tray, attached to be insertable within housingsand, and within the housings are included a disc motor, an optical pickupand a moving mechanism thereof, and also a unit mechanism chassisfor moving the optical pickup thereon and a controller substratedisposed below the unit mechanism chassis for controlling the optical pickup, and further, a wide-width flexible cablefor electrical connection between the controller substrate and the optical pickup, wherein the optical pickup mounts laser unitsandincluding three (3) pieces of elements, each emitting a laser light different in the wavelength thereof, a penetrating portionand a wall portionare provided in a part of left bottom surface of the tray, while forming a cutoff portionin a part of the chassis, thereby guiding the airflow generated accompanying with rotation of the optical disc onto the optical pickup, with certainty.

Optical disc apparatus including airflow cooling mechanism

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

An inkjet recording medium obtained by forming a coating layer containing a pigment and a binder on the surface of a base material and coating layer is subsequently pressed onto a heated mirror finished surface to dry to form an ink absorbing layer through a cast coating method, wherein pigment contains a colloidal silica that has a primary particle diameter of from 10 nm to 100 nm while the ratio of the secondary particle diameter to primary particle diameter is from 1.5 to 3.0.

Inkjet recording medium

Increases in the data transfer rates of optical disc drives have resulted in problems such as increases in optical disc vibrations due to higher rotation speeds or increases in heat generation due to increases in the output of motors for rotating the optical discs and in the output of laser diodes. To solve such problems, an optical pickup is provided with an air duct therein, and a space that is formed between the optical disc and a top case of a casing and that has negative pressure during rotation of the optical disc is connected to the air duct in the optical pickup via a tube, at least part of the tube being deformable. The optical pickup is cooled by the air flow through the air duct induced by pressure difference.

Optical disc drive

Growing community of inventors

Tsuchiura, Japan

Takayuki Fujimoto