Optical recording medium

US6936325B2 · kind B2 · utility

Assignees

• SONY GROUP CORPORATION · JP
• BAYER HEALTHCARE LLC · DE

Inventors

• Horst Berneth · Leverkusen, DE
• Friedrich-Karl Bruder · Krefeld, DE
• Wilfried Haese · Rheydt, DE
• Rainer Hagen · Leverkusen, DE
• Karin Hassenruck · Mülheim an der Ruhr, DE
• Serguei Kostromine · Rheinbach, DE
• Peter Landenberger
• Rafael Oser · Krefeld, DE
• Thomas Sommermann · Bensberg, DE
• Josef-Walter Stawitz · Cologne, DE
• Thomas Bieringer · Odenthal, DE
• Yuichi Sabi · Tokyo, JP
• Takashi Iwamura · Minato, JP
• Mitsuaki Oyamada · Yokohama, JP
• Hidetoshi Watanabe · Tokoname, JP
• Sakuya Tamada · Kodaira, JP
• Masanobu Yamamoto · Odawara, JP

Key dates

• Filing date: Mar 20, 2002
• Grant date: Aug 30, 2005
• Expiry date: Mar 20, 2022

Classification

• Technology area (CPC G): Physics
• CPC primary: G11B7/259
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

An optical recording medium having at least a recording layer 11 and a light transmitting layer 13 formed on a substrate 10, in which the recording layer 11 is 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 layer 13 is 10 μm to 177 μm in thickness, the relation between absorption coefficient “k” and pyrolysis temperature Tdec of organic material is950(° C.)<(Tdec (° C.)−20)/k<4100° C.  (1),and the absorption coefficient “k” is k>0.0.