Pioneer Corporation

Tdk Corporation

Pioneer Electronic Corporation

Masataka Yamaguchi

Yasuo Hosoda

Ayumi Mitsumori

Megumi Sato

Yoichi Okumura

Hiroyasu Inoue

Koji Mishima

Takamasa Yoshikawa

Kiyohide Ogasawara

Nobuyasu Negishi

Tetsuya Iida

Masaki Aoshima

Satoshi Jinno

Takahiro Togashi

Takashi Chuman

Shingo Iwasaki

Hiroshi Ito

Toshihiko Takishita

Takao Tagiri

Seiro Oshima

Nobuaki Onagi

Takahiro Kobayashi

Seiro Fujii

Shinichiro Suzuki

Masayasu Yamaguchi, Deceased

Tomoaki Izumi

An optical-recording medium is provided with at least a first recording layer for recording information optically; and a second recording layer for recording information optically by a light beam that passes through said first recording layer; wherein the track pitch of a recording track that is formed on said second recording layer is narrower than the track pitch of a recording track that is formed on said first recording layer.

Optical recording medium, information recording apparatus and information reproduction apparatus

An information recording medium has an excellent jitter characteristic with a considerable difference in reflectance between prior to and subsequent to recording. The information recording medium includes a recording layer which contains a material having a reflectance which varies by irradiation of a light beam, on which information is recorded as reflectance variations, and a substrate for supporting the recording layer, the recording layer including a metal nitride as a major component. In a method of manufacturing the information recording medium having a recording layer which includes a material having a reflectance which varies by irradiation of a light beam, on which information is recorded as reflectance variations, and the substrate for supporting the recording layer, the recording layer including a metal nitride as a major component, the method includes a recording layer forming step for forming the recording layer by a reactive sputtering method which uses a target comprised of a metal constituting a metal nitride, wherein a flow ratio Ar:Nin an atmosphere including Ar and Nin the recording layer forming step is set within the range of 80:10 to 10:80.

Information recording medium and process for producing the same

An optical recording medium records information so that a recording density of a first recording layerat the most distant part from a incidence plane of laser beam is higher than that of a second recording layerat the incidence plane side.

Optical recording medium and optical recording method

An optical recording medium includes a recording layer containing an alloy represented by a general formula: (TiM)M, where element Mis Si or Al, element Mis an element selected from the group consisting of Si, Al and Fe and different from the element M, x is equal to or larger than 0.3 and equal to or smaller than 0.8, and y is equal to or larger than 0.75 and equal to or smaller than 1. The thus constituted optical recording medium only places minimal load on the global environment.

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

An optical recording medium includes a recording layer containing as a primary component an alloy containing at least two elements selected from the group consisting of Fe, Al and Si and the alloy contained in the recording layer as a primary component has a composition [x, y, z] in terms of the ternary composition diagram that falls within a region of a pentagon defined by straight lines connecting points [57, 43, 0], [0, 55, 45], [15, 0, 85], [89, 11, 0] and [0, 16, 84] in the ternary composition diagram. According to the thus configured optical recording medium, only minimal load is placed on the global environment.

A stack '0' having a recording layer serving to transmit a light beam includes a heat dissipating layer, a reflective layer, an enhanced layer, and the recording layer, which are formed in that order on an intermediate layer. The reflective layer is translucent to a light beam, while the heat dissipating layer has a thermal conductivity higher than that of the intermediate layer as well as a refractive index higher than or equal to that of the intermediate layer and less than or equal to a refractive index 3. The thickness of the heat dissipating layer is set to a value within the range of a predetermined condition defined in accordance with a refractive index, the wavelength of the light beam, and a given integer. Thus, an information read/write medium configured to enable information to be recorded/reproduced thereon/therefrom as well as to effectively cool a recording layer serving to transmit a light beam is provided.

Information read/write medium

An information recording medium has a light transmissive layer, a first information recording layer, a transparent layer, and a second information recording layer sequentially stacked to reproduce information signals upon exposure of the light transmissive layer to laser light, wherein the first information recording layer comprises a first protective layer, a phase change recording film, and a second protective layer sequentially from the light transmissive layer, and the rate of power fluctuation between a reproducing light passing through a recorded region of the first information recording layer and that passing through an unrecorded region of the first information recording layer during reproduction of the information signals from the second information recording layer, are within 10%, whereby the information signals can be recorded/reproduced on/from the second information recording layer through the first information recording layer satisfactorily.

Phase-change type optical storage medium having multiple recording layers

An electron emission device includes: a semiconductor layer; a porous semiconductor; and a thin-film metal electrode which are layered in turn. The electrode faces a vacuum space. The porous semiconductor layer has at least two or more of porosity-changed layers which have porosities which are different from each other in the thickness direction. The electron emission device emits electrons when an electric field is applied between the semiconductor layer and the thin-film metal electrode. An insulator layer made of a material selected from silicon oxide or silicon nitride may be formed between the porous semiconductor layer and the thin-film metal electrode. Si skeletons of the porous semiconductor layer are oxidized or nitrided.

Electron emission device and display device using the same

An optical recording disk in which a transfer layer having grooves made of ultraviolet setting resin is laminated on the surface of a substrate, and in which a recording layer is laminated on the transfer layer, the optical recording disk comprises a peeling protrusion projectingly provided on the inner circumferential side of the transfer layer.

Optical recording disk and manufacturing method thereof

Growing community of inventors

Tsurugashima, Japan

Masataka Yamaguchi