Sharp Kabushiki Kaisha Corporation

Other

Ford Motor Company Limited

Sharp Corporation

Hiroyuki Katayama

Kenji Ohta

Akira Takahashi

Junichiro Nakayama

Junji Hirokane

Yoshiteru Murakami

Michinobu Mieda

Tomoyuki Miyake

Kazuo Van

Kunio Kojima

Tetsuya Inui

Hiroshi Fuji

Shinzo Sawamura

Masaki Hamamoto

Hideyoshi Yamaoka

Junichi Sato

Yasushi Ogimoto

Kazuhiro Kimura

Junji Tominaga

Naoyasu Iketani

Nobufumi Atoda

Yukinori Nishitani

Kosuke Watanabe

Kenji Nakanishi

Junsaku Nakajima

Junichi Washo

Toshio Ishikawa

Masato Kawanishi

Shozo Kobayashi

Hiroshi Suzuki

Toshitaka Tamura

Junji Hirogane

Toshihisa Deguchi

Akiyoshi Fujii

Hirotsugu Matoba

Takahiro Miyake

Masaaki Katoh

Mitsuhiko Yoshikawa

Takatoshi Mizoguchi

Shintaro Miyanishi

Mitsuo Ishii

Takayuki Taminaga

Yoshikazu Fujii

Yoshiaki Ogura

Hirotaka Toki

Hiromi Nishino

Katsuyasu Deguchi

Tomokazu Ise

Hiroyuki Ikenaga

Kazuhisa Murata

Kouji Ohta

Ichiro Hiramatsu

Kazuhisa Takayama

Jooho Kim

Junichi Satoh

In a regenerator to be formed by winding a resin film into a cylindrical shape, a projection is formed on a surface of the resin film by subjecting the resin film in itself to plastic deformation, either by stamping or by laser beam irradiation. Thereafter, the resin film is stacked. The projection provides a gap between layers of the stacked resin film to be a flow passage for a working gas. Thus, a regenerator of high heat exchange efficiency is provided with ease and at low cost.

Regenerator method for manufacturing regenerator, system for manufacturing regenerator and stirling refrigerating machine

A magnetic signal recording method of the present invention superimposes a recording edge of a recordable region on a region where there is substantial equality between (a) a coercive force in a region on a magnetic recording medium in which the coercive force has been varied, and (b) magnetic field intensity, which is generated by a magnetic recording head. The magnetic field intensity has a magnetic field distribution whose lowering rate in an in-track position is maximum in the region. The magnetic recording head, whose recording magnetic field is distributed in a rectangular shape, is used in this way so as to form a magnetic bit having a rectangular shape that is suitable for reproduction performed by a common reproduction head having a rectangular reproduction region, thereby improving an S/N of a reproduction signal dramatically.

Magnetic signal recording method and magnetic recording-reproduction apparatus

An LED lamps capable of composing a display panel that is installed at any outdoor place and capable of displaying an image thereon with a high contrast under any working conditions at any place. The LED lamp comprises at least one LED chip for emitting visible light, a lead frame comprising a common part and separate parts for supplying electric power to each of electrode terminals of the LED chip and a transparent resin part disposed on the common lead frame for mounting the LED chip and converging light emitted from the LED chip, wherein the LED-chip-mounted surface is provided with an anti-reflection black-colored layer for absorbing light. The LED chip may be a four-element LED chip composed of an active layer of AlGaInP and the light-absorbing layer formed from any of black silver sulfide, silver oxide, iron oxide, chromium oxide, black silver paste and black copper paste.

LED lamp configured to minimize image contrast

In a method of recording and reproduction using a magnetic storage medium, a magnetic storage medium () is used in which at least magnetic recording film () and a superconducting film () are deposited. According to the method,

Magnetic recording medium and method of recording

An information write/read head writes or reads information on or from recording tracks by the heat-assisted system. The information write/read head includes a magnetic head provided in such a manner that a longitudinal direction of a magnetic gap crosses a scanning direction. Further, the information write/read head includes an aperture slit having a length of not less than a diffraction limit of a light beam, and a width shorter than the diffraction limit in the direction orthogonal to the recording track, which is formed in such a manner that the longitudinal direction thereof is aligned in a scanning direction of the recording track.

Information write/read head including an optical slit having a light emitting section whose width is shorter than a light beam diffraction limit

An optical sample includes a mask layer made of a material in which an aperture is produced by a chemical change, which is reversible, upon application of heat or light, and a recording layer provided at a position where an evanescent field produced in the aperture when light is applied to the mask layer can reach. Since the aperture is produced in the mask layer by a chemical change, it can be opened and closed at a high speed and hence a high-speed transfer of information can be achieved.

Optical sample and method of writing and reading information on the same

An information recording and reproducing device includes a magnetic information detecting section for magnetically detecting magnetic information recorded at a given position on a recording medium, an optical information detecting section for optically detecting optical information recorded at a given position on each track of the recording medium, and a positional control section for controlling a position on the track using the detected magnetic information and optical information.

Information recording and reproducing device and tracking servo system therefor

A magnetic recording medium, which includes a substrate and an amorphous magnetic layer, made of an amorphous magnetic material, for magnetic recording of data, is provided with an underlayer between the substrate and the amorphous magnetic layer, the underlayer being made of amorphous metal element, and having a mean thickness of 10 nm or less. In this manner, movement of magnetic domain walls of the amorphous magnetic layer is effectively limited by minute irregularities on a surface of the underlayer. This realizes a stable formation of a minute recording mark. This realizes recording having a sufficient signal quality, even when the high-density recording is performed by forming such a minute recording mark that a shortest length of the recording mark is less than 100 nm. Moreover, this allows the magnetic recording medium to have a simplified layer structure. Further, a magnetic recording apparatus magnetically records data onto a magnetic recording medium having the above arrangement, by heating a portion of the magnetic layer by radiating a light beam locally, and by applying a magnetic field on at least part of the portion of the magnetic layer on which the light beam is radiated. This provides a magnetic recording apparatus for high-density recording.

Magnetic recording medium and magnetic recording apparatus using same

An optical recording medium in accordance with the present invention is provided with a substrate, a mask layer, provided on the substrate, whose index of refraction changes due to light or heat of the substrate, and a recording layer that is provided away from the mask layer by a distance that is not more than a distance which allows the near-field light to reach. The mask layer generates a minute opaque region in a light spot and the recording layer is a magneto-optical layer. An optical recording and reproduction apparatus in accordance with the present invention uses the optical recording medium. This allows to provide an optical recording medium and an optical recording and reproduction apparatus that can suppress the erasure of recorded marks and carry out the reproduction again and again.

Optical recording medium and optical recording and reproduction apparatus

A composite magnetic head device includes a recording head and a reproducing head for magnetically recording and reproducing information on and from a recording medium, and further includes heat sources for heating the recording medium when recording and reproducing. As the heat sources, diffraction grating patterns for the recording head and the reproducing head are formed independently. With this structure, when recording and reproducing information based on the thermal distribution of the recording medium heated by the heat sources, the thermal damage on the recording medium can be suppressed, and the likelihood of such problem that the recording medium is heated too much and the information recorded in the heated portion are erased can be prevented.

Composite magnetic head device

A light emitting device for focusing a laser beam without adopting an optical lens system is provided, as well as a composite magnetic recording head and a magnetic recording device, which realize a smaller laser spot diameter and a sharp magnetic field distribution, whereby an optical-assisted high density magnetic recording can be realized, and which also realize a simplified head structure, and improvements in productivity and costs. The composite magnetic recording head is prepared by integrally forming a magnetic coil layer for use in magnetic recording at around the center of the surface-emitting laser aperture, and further, a shielding plate is formed at the center of the laser aperture. As a result, a laser beam can be focused on the irradiation surface of the magnetic recording medium at portion right below the shielding member so as to locally heat the irradiated portion, and further a magnetic field for magnetic recording is applied in the laser heated portion, thereby realizing a high density magnetic recording.

Magnetic recording head and magnetic recording device

An optical recording medium includes a recording layer and a mask layer on a substrate. The mask layer is formed of a material whose light transmittance is decreased by light irradiation and is increased by heating.

Optical recording medium and reproducing method therefor

An optical device and a recording medium are provided with a recording layer for recording information by radiation of light, and a mask layer which is formed closely to the recording layer, reduces its transmittance of light due to light or heat, and transmits light to the recording layer by using a near-field effect. An optical reproducing and recording method includes the steps of: emitting a laser beam onto the mask layer, generating a near field around an area of the mask layer that has transmittance being reduced by the laser beam, and reproducing or recording optical information in the recording layer by interaction between the near field and the recording layer. With this method, it is possible to provide the optical device, recording medium, and optical reproducing and recording method that can realize a high S/N ratio upon reproducing and recording and that can readily form a recording mark.

Optical reproducing and recording method, recording medium, and optical device

A magnetic storage medium includes a magnetic storage medium that exhibits a magnetic compensation temperature specified higher than room temperature to minimize effects of heat generated by a head using magneto-resistance effect. In a heat assisted recording and reproduction method using such a magnetic storage medium, during reproduction, the S/N ratio in a reproduction signal is enhanced by optimizing the bias current applied to the head using magneto-resistance effect. A magnetic storage medium and a heat assisted recording and reproduction method using such a magnetic storage medium whereby information is magnetically recorded and reproduced by heating a read-out domain are offered that enables signal reproduction with a good S/N ratio despite possible use of a head exhibiting magneto-resistance effect.

Magnetic storage medium and heat assisted recording and reproduction method

A thermomagnetic recording medium includes a thermal change layer whose thermal conductivity is induced to change by a metal-to-insulator transition, is greater on a lower temperature side of a transition temperature and is smaller on a higher temperature side thereof. A thermomagnetic recording method includes setting a recording or reproducing temperature higher than the temperature of the recording medium at the circumference of a light spot and higher than a threshold temperature for change of the thermal conductivity of the thermal change layer. A thermomagnetic recording and reproducing device is provided with the above-mentioned thermomagnetic recording medium, an optical pickup and a magnetic head and conducts recording and reproduction by the above-mentioned thermomagnetic recording and reproducing device.

Thermomagnetic recording medium, thermomagnetic recording and reproducing method, and thermomagnetic recording and reproducing device

Growing community of inventors

Nara, Japan

Hiroyuki Katayama