Sony Corporation

Bayer Aktiengesellschaft

Mitsuaki Oyamada

Yuichi Sabi

Takashi Iwamura

Sakuya Tamada

Shinichiro Tamura

Daisuke Ueda

Katsuhisa Aratani

Horst Berneth

Friedrich-Karl Bruder

Kimihiro Saito

Goro Fujita

Masanobu Yamamoto

Wilfried Haese

Jun Nakano

Hidetoshi Watanabe

Serguei Kostromine

Rainer Hagen

Rafael Oser

Norihiro Tanabe

Josef-Walter Stawitz

Thomas Bieringer

Kouichi Yasuda

Etsuro Ikeda

Thomas Sommermann

Peter Landenberger

Karin Hassenrück

Jingcheng Yuan

Norio Mitsui

An optical information recording medium including a recording layer that can record a large amount of information is manufactured using a simple system. A single recording layer is formed by bonding two optically transparent substrates on which the first photosensitive polymer and the second photosensitive polymer are spread such that the layers of the photosensitive polymers face each other. Furthermore, since the absorptivity of light in the recording layer increases as the focal point of light for information recording moves in a depth direction, information can be recorded without decreasing the recording transfer rate of the information.

Optical information recording medium and method for manufacturing the same

An optical information reproducing apparatus includes: an irradiation section irradiating a light beam onto an optical information recording medium, in which holes are formed along a virtual track on a recording medium, along the virtual track; a light receiving section receiving a reflected light beam when the light beam is reflected by the optical information recording medium and sequentially generating a light receiving signal corresponding to the light intensity; a detection section detecting a variation pattern appearing when a signal level of the light receiving signal changes according to the hole; and a code string generating section, when generating a code string corresponding to the signal level, generating a code corresponding to the one hole from the variation pattern if the variation pattern falls within a range and generating a code string, which includes a plurality of codes, from the variation pattern if the variation pattern exceeds the range.

Optical information reproducing apparatus and optical information reproducing method

The invention is able to enhance a recording speed. In the invention, a recording mark (RM) composed of a cavity is formed by vaporizing a two-photon absorbing material by a two-photon absorption reaction as an embodiment of a photoreaction against a recording light beam (L) as recording light to be condensed at the time of recording information. Also, in a recording layer (), the information is reproduced on the basis of a return light beam (L) formed by modulation of a readout light beam (L) irradiated as prescribed readout light at the time of reproducing inform in conformity with the presence of absence of the recording mark (RM). Then, in the recording layer (), in view of the fact that the a two-photon absorbing particle having a two-photon absorbing material coordinated with a metal fine particle (MN) is dispersed in a binder resin configuring the recording layer (), the two-photon absorbing material having a two-photon absorbing characteristic is disposed as a vaporizable material in the vicinity of the metal fine particle (MN) dispersed in the binder resin.

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

A write once optical recording medium has an inorganic recording film which includes an oxide film having germanium oxide (GeO) as a principal component, and a metal film adjacent to the oxide film, the metal film having a titanium/silicon alloy (TiSi) as a principal component. According to this arrangement, it is possible to construct an inexpensive write once optical recording medium with large strength capable of high density recording by using a short wavelength light source and an optical system with a high numerical aperture having excellent characteristics.

Write once optical recording medium

An optical recording medium using Sn as the recording material to improve the jitter is provided, in which on the surface of a disc substratewhere a concave and convex shape dividing a track area is formed, are formed on the surface of the concave and convex shape a first protective layerfor protecting at least an optical recording layer, an optical recording layerusing a chemical compound at least composed of tin (Sn), nitrogen (N) and oxygen (O), formed on the first protective layer, a second protective layerfor protecting this optical recording layer, formed on this optical recording layer, and a light-transmittable layerformed on the second protective layer; with this structure, the optical recording layerunder high temperature and high humidity can be stabilized by means of the first and second protective layersand

Optical recording medium

A write once optical recording medium includes a substrate on which an oxide film serving as an inorganic recording film is formed, the oxide film being made of a recording material of an oxide GeO(x is an atomic number ratio) of germanium (Ge) and a composition of GeOof the oxide film being specified so as to satisfy 1.0&#x3c;x&#x3c;2.0.

An optical recording medium having two or more information recording layers in which information is recorded at a high recording density. The optical recording medium is comprised of information recording layers between a first surface at which light is incident and a second surface opposite the first surface. The first information recording layer nearest to the second surface is a phase-modulation information recording layer, and the second information recording layer is a reflectance-modulation information recording layer.

Optical recording and reproducing method and apparatus having multiple recording layers

The present invention provides an optical recording medium including a recording layer and an optical reflection layer formed on a substrate. The recording layer contains at least one particular polymethine pigment selected from polymethine pigments having 1 to 4 carbons in the methine main chain, so as to obtain a sufficient recording sensitivity for a red wavelength range of light.

An optical recording medium having at least a recording layerand a light transmitting layerformed on a substrate, in which the recording layeris made of an organic material for absorbing an incident light of wavelength of 360 nm to 460 nm, and inducing physical change or chemical change to vary the refractive index, the light transmitting layeris 10 &#x3bc;m to 177 &#x3bc;m in thickness, the relation between absorption coefficient 'k' and pyrolysis temperature Tof organic material is950(&#xb0; C.)&#x3c;(Tdec (&#xb0; C.)&#x2212;20)/k&#x3c;4100&#xb0; C.&#x2003;&#x2003;(1),and the absorption coefficient 'k' is k&#x3e;0.0.

Optical recording media comprising a base ( ), a recording layer ( ) formed thereon, and a reflecting layer ( ) formed on the layer ( ), wherein the recording layer ( ) contains at least one kind of specified dyes selected from among polymethine dyes having 1 to 4 carbon atoms in the main methine chain to secure a sufficient recording sensitivity to a light in the red wavelength region.

Growing community of inventors

Kanagawa, Japan

Mitsuaki Oyamada