Sony Corporation

Nippon Steel Corporation

Ricoh Company, Ltd.

Kobe Steel, Ltd.

Kabushiki Kaisha Kobe Seiko Sho

Mitsubishi Hitachi Power Systems, Ltd.

Mitsubishi Heavy Industries Limited

Nippon Steel Sumitomo Metal Corporation

Takeshi Miki

Goro Fujita

Yuki Tauchi

Tsutomu Sato

Kazuhiko Fujiie

Tatsuya Tomura

Tetsuhiro Sakamoto

Mikiko Takada

Yasuhito Tanaka

Yuji Arai

Masaomi Sasaki

Masayuki Yamamoto

Masahiro Yamazaki

Niall James Caldwell

Koji Ashizaki

Jun Nakano

Yuuki Tauchi

Masayuki Shimizu

Toshikazu Hayashi

Kentaro Hayashi

Atsuro Iseda

Makoto Watanabe

Junichi Kitabayashi

Kazuhiro Uchida

Manami Miyawaki

Atsushi Yuge

Takashi Nakashima

Daniil Sergeevich Dumnov

Masahiro Toda

Kazutomo Miyata

Yoko Shida

Hisamitsu Kamezaki

Hiroshi Tabata

Takashi Shimouma

Kensaku Takahashi

Teruyuki Ota

Shunichi Otsuka

Shinichiro Mori

Takao Yokokawa

Yasuhiro Sone

Osamu Kada

Masato Nakakura

Yusuke Mihara

Yohsuke Uchida

Toshitaka Tamano

Takeo Ohira

Osamu Uehara

Michiya Uchida

Hiroyasu Ochiai

A seamless steel pipe is provided that has a chemical composition which consists of, by mass %, C: 0.10 to 0.20%, Si: 0.05 to 1.0%, Mn: 0.05 to 1.2%, P&#x2264;0.025%, S&#x2264;0.005%, Cu&#x2264;0.20%, N&#x2264;0.007%, Ni: 0.20 to 0.50%, Cr: 0.30% or more and less than 0.50%, Mo: 0.30 to 0.50%, Nb: 0.01 to 0.05%, Al: 0.001 to 0.10%, B: 0.0005 to 0.0020%, Ti: 0.003 to 0.050%, V: 0.01 to 0.20%, a total of any one or more elements among Ca, Mg and REM: 0 to 0.025%, and the balance: Fe and impurities, and for which Pcm (=C+(Si/30)+(Mn/20)+(Cu/20)+(Ni/60)+(Cr/20)+(Mo/15)+(V/10)+5B)&#x2264;0.30. The steel micro-structure includes, in area %, tempered martensite &#x2265;90%. The tensile strength is 980 MPa or more, and a Charpy impact value at &#x2212;40&#xb0; C. using a 2 mm V-notch test specimen is 75 J/cmor more.

Seamless steel pipe and method for producing same

The production method for producing a rifled tube, which includes a plurality of first helical ribs on its inner surface, includes: a steps of: preparing a steel tube; and producing a rifled tube by performing cold drawing on a steel tube by using a plug which includes a plurality of second helical ribs, the plug satisfying Formulae and:0.08 &#x3c;&#xd7;()&#xd7;/(2&#x3c0;&#xd7;)&#x3c;0.26&#x2003;&#x2003;(1)0.83&#x3c;&#xd7;()&#xd7;/(2&#xd7;)&#x3c;2.0&#x2003;&#x2003;(2)where, W is a width of a groove bottom surface of the helical groove; A is a maximum diameter of the plug; B is a minimum diameter of the plug; N is a number of the second helical ribs; S is the width of the groove bottom surface; and M is a pitch of adjacent second helical ribs.

Method for producing a rifled tube

The present technology relates to an optical recording medium for realizing an optical recording medium capable of high-capacity recording. A groove and a land are formed, the groove being concave and the land being convex when seen from a side of a laser light incident surface, both of the groove and the land being recording tracks where recording or reproduction of information is performed. According to this recording layer, a pitch between the groove and the land that are adjacent recording tracks is within a range of 250 nm to 200 nm. Moreover, recording or reproduction of information is performed with respect to the recording tracks by irradiation of laser light whose wavelength is 400 nm to 415 nm by an optical system whose NA is 0.85&#xb1;0.1.

Optical recording medium

An optical information recording medium includes: a substrate; two or more information signal layers provided on the substrate; and a cover layer provided on the information signal layers. At least one of the two or more information signal layers is provided with an inorganic recording layer including Pd oxide, a first protective layer provided on a first main surface of the inorganic recording layer, and a second protective layer provided on a second main surface of the inorganic recording layer. And at least one of the first protective layer and the second protective layer includes a compound oxide of Si oxide, In oxide and Zr oxide as a main component.

Optical information recording medium

An optical recording medium including a substrate and two or more recording layers that contain Pd, O, and M (M comprises at least one of Zn, Al, In, and Sn), where O is contained in an amount greater than a stoichiometric composition thereof when M is completely oxidized (into ZnO, AlO, InO, and SnO). An nth recording layer of the two or more recording layers, as counted from an opposite side of an incident side of recording light, has a Pd content that is less than that of an (n&#x2212;1)th recording layer.

[Object] To provide an optical recording medium that can be applied to a write-once optical recording medium having a high capacity of about 25 GB per one layer, and has good recording properties when a multilayered recording layer configuration is provided. [Solving Means] It includes a substrateand two to four recording layersandAt least one or more of these recording layersandare specific recording layers with a composition containing PdO and PdOas well as at least one of completely oxidized In, Zn, Al and Sn (in other words, InO, ZnO, AlOand SnO). Adjacent to the specific recording layers, dielectric layersandof In/Al oxide layers containing at least either of In or Al as a main component are disposed.

A recording layer for optical information recording medium excellent in recording property, an optical information recording medium including the recording layer and a sputtering target useful for formation of the recording layer are provided. A recording layer for an optical information recording medium on which recording is performed through irradiation with laser light, the recording layer including an oxide of a metal of which an absolute value of the standard free energy of oxide formation per 1 mol of oxygen is larger than that of Pd (hereinafter referred to metal X) and a Pd oxide, wherein the Pd oxide includes a Pd monoxide and a Pd dioxide, and wherein a ratio of the Pd atom to a total of the metal X atom and the Pd atom which are contained in the recording layer is 4 to 85 atomic %.

Recording layer for optical information recording medium, optical information recording medium, and sputtering target

The present invention provides an optical recording medium realizing reduced manufacturing cost of the optical recording medium. An optical recording mediumincludes: a substrate; a recording layerformed on the substrate, containing In, Sn, Pd, and oxygen, and containing oxygen atoms more than stoichiometric composition of the case where the In and the Sn are completely oxidized; and a light transmission layerformed on the recording layer

Optical recording medium and method for manufacturing the same

An optical recording medium includes: a substrate; an information recording layer that is formed on the substrate and that has a recording film, which contains Zn or Al, Pd, and oxygen and in which the amount of oxygen is larger than that in a stoichiometric composition when Zn or Al is completely oxidized to become ZnO or AlO; and a light transmissive layer formed on the information recording layer.

A two-photon absorption material represented by the following General Formula (I): 

Two-photon absorption material and application thereof

A photosensitized composite material and a material, an element, a device, and the like, which employ the photosensitized composite material, are provided. In the photosensitized composite material, multiphoton absorption compounds are highly sensitized for practical use by utilizing an enhanced plasmon field. The photosensitized composite material has a structure where the multiphoton absorption compounds are linked to the surface of a fine metal particle through linking groups. The fine metal particle generates an enhanced surface plasmon field in resonance with a multiphoton excitation wavelength. The multiphoton absorption compounds have a molecular structure enabling multiphoton absorption. The photosensitized composite material is contained in or used for, for example, a three-dimensional memory material and a three-dimensional recording medium, an optical power limiting material and an optical power limiting element, a photocuring material and a stereolithography system, and a fluorescent material for a multiphoton fluorescence microscope and a multiphoton fluorescence microscope.

Material for multiphoton fluorescence microscope and multiphoton fluorescence microscope

A light source unit comprises a plurality of light sources emitting a plurality of light beams. A plurality of volume hologram elements are provided for the plurality of light sources respectively, each volume hologram element having a plane of incidence of an incoming light beam and a plane of outgoing radiation of a diffracted light beam which are perpendicular to each other, the plurality of volume hologram elements having mutually different Bragg conditions in which an optical intensity of a diffracted light beam is set to a maximum.

Light source unit, optical detector unit, optical pickup device, and optical disk device

An optical disc recording medium is irradiated with laser light having a predetermined laser power to deform an irradiated portion of a substrate into a protruding portion. Since the substrate is deformed so as to have protruding portions, a reflecting layer arranged on the substrate is also deformed so as to have protruding portions. For a pit, the deformed state of a protruding portion allows to obtain a reproduced signal level equivalent to that in each land. For a land, the deformed state of a protruding portion allows to obtain a reproduced signal level equivalent to that in each pit. Since the deformed state of each protruding portion can be controlled on the basis of the power of the laser light for irradiation, pit-to-land deformation and land-to-pit deformation can be performed by setting the laser power. Thus, recorded data can be rewritten on the optical disc recording medium recorded with the data using a combination of pits and lands formed in the substrate.

Recording device, recording method, disc manufacturing method and optical disc recording medium

An optical disk is disclosed. The optical disk includes a substrate having lands and pits arranged and formed along a recording track so that data are recorded; a reflective film deposited on the substrate; and a protective layer formed on the reflective film, where an edge of the pits in the array direction is irradiated with light from a side of the protective layer to deform the pits, so that pit data are rewritten and recorded, and the reflective film includes an alloy formed of AlFeX having Al as a main component, where X contains any one or more of Ti, Cu, Au, Pt, and Si.

Optical disk and method or producing optical disk

A magneto-optical recording medium in which the inside of grooves formed along recording tracks is a signal recording area in groove recording, and the domain wall displacement detection method is employed; and a curvature radius R, in the cross section perpendicular to the recording tracks, of a shoulder portion of a land separating the grooves that is adjacent to the groove is 30 nm or less and a curvature radius R, in the cross section perpendicular to the recording tracks, of the inside edge portion of the groove for the recording that is adjacent to the land is 20 nm or more, so that a wide recording power margin can be obtained, the jitter can be improved, and the error rate can also be improved.

Magneto-optical recording medium

Growing community of inventors

Tokyo, Japan

Takeshi Miki