Ricoh Company, Ltd.

Nsk Corporation

Nippon Seiko Kabushiki Kaisha

Other

Nsk-Warner K.k.

Nippon Seiko Kabushiki Ksiahs

Yoshitaka Hayashi

Toshishige Fujii

Noboru Sasa

Katsuyuki Yamada

Hiroshi Miura

Hiroshi Deguchi

Makoto Harigaya

Yoshiyuki Kageyama

Hiroko Iwasaki

Yukio Ide

Masaetsu Takahashi

Masaki Kato

Hiromichi Takemura

Toshihide Sasaki

Toshiyuki Kabata

Yasuo Murakami

Nobuaki Mitamura

Hiroyoshi Sekiguchi

Toshiyuki Ohsawa

Atsuyuki Watada

Shinya Narumi

Okitoshi Kimura

Noriyuki Iwata

Hiroshi Suzuki

Yoshio Kinoshita

Tomohiro Inoue

Kenichi Abe

Susumu Tanaka

Hiroshi Yabe

Suguru Sangu

Masataka Mohri

Masao Shoji

Hiroshi Fukushima

Kinji Yukawa

Masayuki Fujiwara

Hisamitsu Kamezaki

Kawori Tanaka

Takeshi Kibe

Yoshiko Kurosawa

Nobuo Katagiri

Hirotaka Komoda

Hirofumi Nakagomi

Tatsuro Miyoshi

Kazuo Sekino

Hiroyuki Iechi

Minao Umeda

Takeshi Ito

Kengo Makita

Shiro Takeuchi

Hayato Ohmi

Katsuya Shimeno

Tomoharu Saito

Shigeharu Nishimura

Nobuhiro Horiuchi

Takanori Tanaka

Tadashi Watanabe

Nobuaki Toyoshima

Toshiharu Honda

Hiroki Maejima

Kenichi Akamine

Hideyuki Yasufuku

Yumiko Suzuki

Takashi Miyamoto

Takao Obara

Keeichi Minagi

Yasushi Tanoue

Suetsugu Mitsusada

Miyako Shibazaki

An optical recording medium containing a substrate and a recording layer over the substrate, wherein the recording layer primarily contains Bi and O, and further contains B and at least one element X selected from Ge, Li, Sn, Cu, Fe, Pd, Zn, Mg, Nd, Mn and Ni, and a sputtering target containing Bi, B and at least one element X selected from Ge, Li, Sn, Cu, Fe, Pd, Zn, Mg, Nd, Mn and Ni.

Optical recording medium, and sputtering target and method for producing the same

The present invention provides a write-once-read-many optical recording medium comprising a substrate, a recording layer comprising any one of bismuth and an oxide of bismuth, an overcoat layer and a reflective layer in this order from a laser beam incident plane, wherein the write-once-read-many optical recording medium has a reflectivity of 35% or less when a laser is applied to the flat part of the substrate or a write-once-read-many optical recording medium comprising a substrate, an undercoat layer, a recording layer comprising any one of bismuth and an oxide of bismuth, an overcoat layer and a reflective layer in this order from a laser beam incident plane, wherein the write-once-read-many optical recording medium has a reflectivity of 35% or less when a laser is applied to the flat part of the substrate.

Write-once-read-many optical recording medium

A write-once-read-many optical recording medium is disclosed that includes a support substrate; a recording layer on the support substrate, the recording layer containing an oxide of one of a metal and a metalloid as a principal component; and a layer adjacent to the recording layer. The recording layer includes a region where a constituent element of the adjacent layer is dispersed. Recording and reproduction are performable with laser light of a blue wavelength region.

Worm optical recording medium

It is an object of the present invention to provide an optical recording medium containing a laminated structure of a first deformable material layer containing a phase-change material that absorbs light at a recording wavelength to generate heat and is subject to exothermic melting and deformation and a second deformable material layer containing a material which contains a silicon oxide (SiOx; 0&#x3c;x&#x2266;2) that transmits light and is subject to thermal deformation and alteration. After information is recorded, the thickness of the first deformable material layer is changed according to the recorded information making center of the recorded marks thicker than the ends and the second deformable material layer is deformed and altered corresponding to the concave-convex-pattern formed on the first deformable material layer based on the recorded information and when the information is reproduced, the first deformable material layer is altered from solid to molten state.

Optical recording medium and recording and reproducing method using the same

To provide an optical recording medium including a substrate and over the substrate at least a recording layer that can record and reproduce with laser light in a blue wavelength region, wherein the recording layer includes Bi and O as main components, further includes at least any of C and N, and does not include Fe; or an optical recording medium including a substrate and over the substrate at least a recording layer that contains, as main components, Bi oxide, and a simple substance of each of one or more elements M (except Bi, C, and N) that enhance a light absorption function for a recording and reproducing laser light, wherein the optical recording medium can record and reproduce with laser light in a blue wavelength region, is provided.

Optical recording medium, sputtering target, and method for manufacturing the same

To provide a sputtering target for preparing a recordable optical recording medium characterized by comprising Bi and B and a manufacturing method thereof, a recordable high density optical recording medium using the sputtering target, and a sputtering target which is capable of improving a speed of the film formation for the improvement of productivity, which has a high intensity at the time of the film formation and which has a heightened packing density.

Sputtering target and manufacturing method therefor, and recordable optical recording medium

An object of the invention is to provide an optical-recording medium in which problems such as cross-write, i.e., signals are recorded wrongly on adjacent tracks, and cross-erase i.e., recording signals on adjacent tracks are erased wrongly, can be solved, and which enables high-density recording; a method for producing the optical-recording medium; and a method for recording and reproducing an optical-recording medium. To achieve this object, the optical-recording medium includes a substrate, an optical-absorption layer which absorbs light and generates heat on or above the substrate, a recording layer, and record-blocking portions which block recording on the recording layer, in which the record-blocking portions are disposed between the recording layer and the optical-absorption layer, and between adjacent tracks, and recording marks are formed on the recording layer by the optical absorption function of the optical-absorption layer.

Optical-recording medium, method for producing the same, and method for recording and reproducing optical-recording

To provide a sputtering target used for the formation of a recording layer of a recordable optical recording medium, wherein the sputtering target contains Bi and Fe and the packing density of the sputtering target is greater than 96%, and a recordable optical recording medium manufactured by using the sputtering target, which the recordable optical recording medium is capable of high-density recording even in the blue laser's wavelength range.

Sputtering target and manufacturing method therefor, and optical recording medium and manufacturing method therefor

For recording information at high density even at blue-laser wavelengths, a write-once-read-many optical recording medium includes a first inorganic thin film and at least one of a second inorganic thin film and an organic thin film, in which the first inorganic thin film contains at least 'R' and 'O,' wherein &#x201c;R&#x201d; is at least one selected from Y, Bi, In, Mo, V and lanthanum series elements; and &#x201c;O&#x201d; is oxygen atom, and the second inorganic thin film and the organic thin film are capable of suppressing at least one of deformation and breakage of the first inorganic thin film and receiving the change of state of the first inorganic thin film.

Write-once-read-many optical recording media and process for recording and reproducing information on the media

A bearing is provided to have sufficient durability even when CVT fluid having a low viscocity is used, with its flow rate kept small, so that the efficiency of the belt-type continuously variable transmission is improved. The material of the races including the outer raceis made of a iron-base alloy containing, by weight, C of from 0.15% to 0.5%, Si of 0.1% to 1.5%, Mn of 0.1% to 1.5%, and Cr of 0.5% to 3.0%. This material is subjected to carbonitriding, quenching, tempering and quenching finish. The surface portion of the outer racewayon the inner peripheral surface of the outer raceis formed with a surface layer containing C of from 0.8 weight % to 1.2 weight % and N of from 0.05 weight % to 0.50 weight %.

Rolling bearing for belt driven continuously variable transmission

A rolling bearing for belt-type continuously variable transmission with a metal belt including pieces has an inner ring; an outer ring; and rolling elements, wherein at least one of the inner ring, the outer ring and the rolling element is made of an iron alloy having a chromium content of from 2.5 to 20.0% by weight.

Rolling bearing for continuously variable transmission

A starting clutch includes a planetary mechanism; a first clutch for outputting a torque to an outer diameter portion of the planetary mechanism; a second clutch for outputting the torque to an intermediate portion of the planetary mechanism; and a lock mechanism for locking a reactive force from an inner diameter portion of the planetary mechanism.

Starting clutch and method of controlling the same

A sputtering target for fabricating a recording layer of a phase-change type optical recording medium contains a compound or mixture including as constituent. elements Ag, In, Te and Ob with the respective atomic percent (atom. %) of &agr;, &bgr;, &ggr; and &dgr; thereof being in the relationship of 2&lE;&agr;&lE;30, 3&lE;&bgr;&lE;30, 10&lE;&ggr;&lE;50, 15&lE;&dgr;&lE;83 and &agr;&plus;&bgr;&plus;&ggr;&plus;&dgr;&equals;100, and a method of producing the above sputtering target is provided. A phase-change type optical recording medium includes a recording layer containing as constituent elements Ag, In, To and Sb with the respective atomic percent of &agr;, &bgr;, &ggr; and &dgr; thereof being in the relationship of 0<&agr;&lE;30, 0<&bgr;&lE;30, 10&lE;&ggr;&lE;50, 10&lE;&dgr;&lE;80, and &agr;&plus;&bgr;&plus;&ggr;&plus;&dgr;&equals;100, and is capable of recording and erasing information by utilizing the phase changes of a recording material in the recording layer. A method of fabricating the above phase-change type optical recording medium is also provided.

Sputtering target, method of producing the target, optical recording medium fabricated by using the sputtering target, and method of fabricating the optical recording medium

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Yokohama, Japan

Yoshitaka Hayashi