Optical recording medium and recording method

US6770346B2 · kind B2 · utility

Assignee

• RICOH COMPANY, LTD. · JP

Inventors

• Makoto Harigaya · Hiratsuka, JP
• Hiroshi Miura · Wako, JP
• Hiroko Okura · Yokohama, JP
• Miku Mizutani · Gyōda, JP
• Eiko Hibino · Yokohama, JP
• Hajime Yuzurihara · Odawara, JP
• Yoshiyuki Kageyama · Tokushima, JP
• Mikiko Abe · Kawasaki, JP
• Hiroshi Deguchi · Yokohama, JP
• Kazunori Ito · Yokohama, JP

Key dates

• Filing date: May 20, 2002
• Grant date: Aug 3, 2004
• Expiry date: May 31, 2022

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/21
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

An optical recording medium comprising a recording layer which comprises a phase-change recording material causing a reversible phase change between a crystalline phase and an amorphous phase by irradiation with an electromagnetic wave, wherein the phase-change recording material mainly comprises materials expressed by the composition formula X&agr;Ge&bgr;Mn&ggr;Sb&dgr;Te&egr; with each of the components respectively fulfills 0&lE;&agr;&lE;5, 1&lE;&bgr;&lE;5, 1&lE;&ggr;&lE;10, 65 &lE;&dgr;<80, 15&lE;&egr;&lE;25, and &agr;&lE;&ggr; (where X expresses at least one of Ga and Sn, &agr;, &bgr;, &ggr;, &dgr;, and &egr; expresses atomic percentage, and fulfills &agr;+&bgr;+&ggr;+&dgr;+&egr;=100).