Fujitsu Corporation

Kabushiki Kaisha Toshiba

Nissan Motor Company Limited

Johnan Seisakusho Co., Ltd.

Hiroshi Hasegawa

Naomasa Nakamura

Naoki Morishita

Yoshinori Honguh

Tadashi Kobayashi

Toyoki Taguchi

Hisato Suzuki

Hiroyuki Uematsu

Masanori Ueda

Noboru Wakatsuki

Kazunori Tochiyama

Masuji Sato

Masaru Tamura

Hiroshi Imai

Masayuki Kikuchi

Yoshinori Kadowaki

Takahiro Ono

Yoshiaki Kamiya

Minoru Shibata

Moriyasu Negita

Yuji Kinoshita

Hiroshi Kogawa

Makoto Nagayama

Kazutoshi Suzuki

A data erasing device that erases data recorded on a magnetic disk, by a magnetic field generated in a horizontal direction by magnets, in order to prevent leakage of the data recorded on the magnetic disk of a magnetic disk device to be abandoned. The data erasing device includes a main body case having a path on which a tray is reciprocated, a demagnetizing circuit having plural permanent magnets adjacently disposed along the path in mutually adsorbing polarities, and a tray for accommodating the magnetic recording medium, and capable of reciprocating on the path. This tray includes a first accommodation groove and a second accommodation groove for accommodating the magnetic disk device. The first accommodation groove and the second accommodation groove cross each other to form an angle of 45 degrees or 90 degrees.

Data erasing device using permanent magnet

In a portable data erasing device, to prevent data leaks from magnetic disk devices to be disposed, data is erased by a simple operation. The data erasing device using a magnetic field generated by permanent magnets to erase data comprises a sliding tray, a main body and a swinging tray. The sliding tray is movable into and out from the main body, two permanent magnets, adjacently arranged so that the north and south poles thereof have mutually attracting polarities, are attached to the front end of the sliding tray. One end of the swinging tray is fixed to the upper surface of the main body by a shaft, so that a magnetic disk device can be mounted and swung on top of the main body. While the sliding tray is extracted stepwise from the main body, the magnetic disk device can be swung, and data on the magnetic disks erased.

The invention enables a magnetic disk drive to be inserted and removed against an attraction force exerted by a magnetic force that is strong enough to erase data on a magnetic disk enclosed within a metal case. A converting mechanism comprising a ballscrew and a ballscrew nut bracket is provided that converts rotational motion of a handle into translational motion of an HDD holder; by rotating the handle, the HDD holder with the hard disk drive mounted thereon is moved in the inserting and removing directions by overcoming the attraction force being exerted by the magnetic field generated by means of a permanent magnet. An electric motor may be used to generate the rotational force.

Data erasing apparatus

A memory storage disk module comprising a memory storage disk unit including at least one memory storage disk, and at least one head able to access the disk for writing and reading data to and from the disk, and a control circuit board. A cover is provided to cover the memory storage disk unit and the control circuit board, and the cover constitutes a shield against an emission of electromagnetic waves, as well as a duct for a flow of cooling air. The cover is composed of a substantially solid main panel portion and front and rear panel portions having small apertures, respectively, allowing air to flow therethrough. A memory storage disk system comprises a plurality of memory storage disk modules, and a rack having the memory storage disk modules therein releasably mounted and being substantially unaffected by electromagnetic waves.

Electromagnetic shielding apparatus for a memory storage disk module which permits air flow for cooling

Electromagnetic shielding apparatus for a memory storage disk module

An optical recording medium, which has a land and a groove on which a record mark is formed, comprises a transparent substrate, an inner protection layer formed on the substrate, a recording material layer formed on the inner protection layer and a reflection layer formed on the outer protection layer. The groove is formed to have a depth of .lambda./6 and the ratio of the thickness of the outer protection layer to the thickness of the recording material layer is set in a range between 0.8 and 1.2.

Optical recording medium and optical recording/reproducing apparatus

An optical recording medium comprises a transparent substrate, an inner protection layer, a recording material layer, an outer protection layer, and a reflection layer, which are laminated in this order. In an in-groove recording mode, the ratio of the thickness of the recording material layer to the thickness of the outer protection layer is in a range between 0.52 and 0.95. In an on-land recording mode, the ratio of the thickness of the recording material layer to the thickness of the outer protection layer is in a range between 0.32 and 0.6.

A piezoelectric transformer comprises a piezoelectric substrate extending in a first direction, a first electrode structure provided on the substrate for exciting an elastic wave propagating through the substrate in the first direction as a result of the piezoelectric transverse effect, and a second electrode structure provided on the substrate for converting the elastic wave to an electric voltage, wherein the first electrode group occupies a first area on the substrate while the second electrode group occupies a second area on the substrate.

Piezoelectric transformer showing a reduced input impedance and

A piezoelectric transformer comprises a piezoelectric substrate carrying thereon an input electrode structure provided on an upper major surface of the piezoelectric substrate for receiving an a.c. voltage for causing an excitation of an elastic wave in the substrate such that the elastic wave propagates through the substrate in a longitudinal direction, an output electrode structure provided on a lower major surface of the piezoelectric substrate for producing an output a.c. voltage by converting the elastic wave into an electric voltage, wherein the input electrode structure and the output electrode structure have a periodical structure in the longitudinal direction with a pitch corresponding to a wavelength of the elastic wave, and wherein at least one of the first and second electrode structures extend in the longitudinal direction from the first longitudinal edge to the second longitudinal edge substantially continuously.

Piezoelectric transformer producing an output A.C. voltage with reduced

A hardtop convertible has a roof which is swingable rearward so as to be stored in a storage chamber. An opening through which the roof enters the storage chamber is covered and uncovered by a slide door.

Vehicle body construction for hardtop convertible

An electromagnetic relay comprising a box-shaped relay case having an upper opening for accommodating therein an electromagnet, a group of resilient contacts and an operation card, and a relay cover for covering the case. The relay case and cover comprise insulated partition walls for separating the electromagnet from the group of resilient contacts. The partition walls are integrally formed with the relay case and the relay cover respectively, and overlap each other when the relay cover is engaged with the relay case. The use of the partition walls provides for an increased withstand voltage for the electromagnetic relay. In addition, the relay has a coil with grooved coil bobbins capable of receiving coil terminals in such a way that the electromagnetic relay may be mounted either in a direction parallel or perpendicular to the base of the relay case.

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Kawasaki, Japan

Hiroshi Hasegawa