Fujitsu Corporation

Tohru Fujimaki

Koichi Tezuka

Tsuyoshi Matsumoto

Satoshi Itami

Kyoko Miyabe

Koji Matsumoto

Hiroyasu Yoshikawa

Kazushi Uno

Goro Kawasaki

Takahiro Imamura

Haruhiko Izumi

Atsuo Iida

Kiyoto Matsui

Toru Yokohata

Yoshiaki Ikai

Nobuyuki Kanto

Yasuyuki Ozawa

Akio Futamata

The present invention efficiently radiates heat generated by a coil while suppressing a decrease in the efficiency of generation of magnetic fields caused by an eddy current. The present invention includes a coil extending spirally in a plane and covered with a dielectric material, a magnetic substance provided parallel with the plane so as to overlap the coil, and a radiator extending in the plane so as to surround the coil and having projecting portions which project toward an outermost periphery of the coil and groove portions recessed in a direction opposite to that in which the projecting portions project, the projecting portions and the groove portions being alternately arranged, the radiator having a higher thermal conductivity than the magnetic substance.

Magnetic field generator, photomagnetic information storing system, and photomagnetic information storing apparatus

A cleaner (C) for an magneto-optical disk device includes a cartridge (), a disk (), an adhesive sheet () stuck to the disk (), a clamping disk (), and a shutter (). The clamping disk () is stored rotatable in the cartridge (), and the disk () is fixed to the cartridge () at a position apart from the clamping disk (). By this means, it becomes possible to safely clean an optical head (). Also, dust can be prevented from scattering to the magneto-optical disk device (P).

Cleaner utilizing adhesive member, and optical information processing device incorporating the same

A method of detecting a gap between a head and a recording medium in an information-recording/reproducing apparatus that uses the head to record and reproduce information in and from the recording medium. In the method, the gap between the head and the recording medium is alternately increased and decreased, thereby gradually reducing the gap between the head and the recording medium. A detection signal is detected from which to determine a contact between the head or a slider supporting the head and the recording medium. When it is determined that the head or the slider has contacted the recording medium, the head is stopped and moved away from the recording medium to a prescribed position, and data representing a distance the head has moved to contact the recoding medium is acquired.

Information-recording/reproducing apparatus and method of detecting the gap between a head and a recording medium

A magneto-optical head including a lens forming a light spot on a storage disk, a magnetic field generating coil arranged between the lens and the disk to surround the optical center of the lens, and an annular heat sink arranged around the coil. The distance between the outer circumference of the coil and the inner circumference of the heat sink is 70&#x2013;100 &#x3bc;m.

Magneto-optical head and magneto-optical disk drive

An optical head has objective lenses that converge a light beam, a light-emitting surface that faces an optical recording medium with an air layer therebetween and from which the light beam converged by the objective lenses exits towards the optical recording medium, and a light reflection preventing film that is provided at the light-emitting surface. A recess is formed in the light-emitting surface, and the light reflection preventing film is provided inside the recess.

Optical head having light reflection prevention film, and optical information processing apparatus incorporating the same

A coil assembly includes a coil arranged around a vertical axis, and a supporting member for carrying the coil. The supporting member is formed with a through hole corresponding to the vertical axis. The coil includes a plurality of coil elements which are connected in parallel.

Optical head having a plurality of coil elements connected in parallel to each other

A magnetic head is provided with a substrate and a magnetic field generating coil formed on the substrate. The substrate has a principal surface facing a storage disk and divided into an inner area and an outer area surrounding the inner region. The magnetic head also includes a dielectric layer enclosing the coil and facing the storage disk. The dielectric layer is formed in the inner area of the principal surface of the substrate but not in the outer area. As tilting, the storage disk comes into contact with the dielectric layer, thereby being prevented from bumping into the outer area of the principal surface of the substrate.

Magnetic head provided with moment-reducing contact for data storage medium

A magnetic head includes a coil for generating a magnetic field, and an electroconductive film superposed over the coil in the axial direction of the coil. The film is formed with a hole in the center. The electroconductive film is composed of a non-magnetic substance, and a first slit is formed in the electroconductive film extending from the hole to the outer peripheral edge of the electroconductive film. A second slit surrounds the inner peripheral edge of the electroconductive film. A continuity component is formed to electrically connect the inner peripheral edge of the electroconductive film to a radially outer region of the electroconductive film.

Magnetic head and data recording and reproduction device

A magnetic head includes a dielectric member, a coil and a heat conductor. The dielectric member has an obverse surface held in facing relation to a data storage disk. The coil generates a required magnetic field. The coil is provided in the dielectric member or in the obverse surface of the dielectric member. The heat conductor absorbs heat generated by the coil. The heat conductor has a heat conductivity which is higher than that of the dielectric member. The heat conductor has a surface which is at least partially irregular.

Magnetic head having an irregular surface for heat dissipation

An optical disk apparatus includes a light source, an objective lens, a slider to hold the lens, a suspension to support the slider, a mirror located below the slider, and a seek mechanism to move the mirror and the slider in the tracking direction of an optical disk to be used. The mirror upwardly reflects light traveling in a predetermined horizontal direction, thereby causing the reflected light to enter the objective lens arranged above the mirror. The mirror is rotatable about a prescribed axis for causing the reflected light to shift in the above-mentioned horizontal direction.

Optical disk apparatus and galvano-mirror used for the same

An information reproducing head which uses a magnetic-substance chip having mono-magnetic domain structure as an information reproducing device so that information, which has been recorded on an information recording medium with a high density, can be copied in an enlarged manner and reproduced with high precision.

Information reproducing device, information recording/reproducing head, and information reproducing method utilizing mono-magnetic domain structure

An optical information recording/reproducing apparatus records information on and/or reproduces information from an optical recording medium based on a reflected light beam from the optical recording medium. The apparatus includes a light splitting part having a plurality of light splitting stages which split the reflected light beam from the optical recording medium into a plurality of light beams, and a photodetector unit including a plurality of photodetectors which receive the plurality of light beams from the light splitting part. The photodetector unit includes a plurality of photodetectors which receive light beams used to detect a focal error, at least one photodetector which receives a light beam used to detect a tracking error, and a plurality of photodetectors which receive light beams used to detect magneto-optic information recorded on the optical recording medium.

Optical information recording/reproducing apparatus

An optical information recording/reproducing apparatus records information on and/or reproduces information from an optical recording medium and detects a focal error based on a reflected light beam from the optical recording medium. The apparatus includes a composite prism which deflects a part of the reflected light beam to at least two positions excluding a central part of the reflected light beam, and a photodetector device having a plurality of photodetectors which respectively detect the deflected parts of the reflected light beam and output detection outputs. The focal error is detected based on the detection outputs of the photodetector device.

Growing community of inventors

Kawasaki, Japan

Tohru Fujimaki