Disc shaped high density recording medium

US8709571B2 · kind B2 · utility

Assignee

• Bayer MaterialScience AG · DE

Inventors

• Friedrich-Karl Bruder · Krefeld, DE
• Wilfried Haese · Rheydt, DE
• Rafael Oser · Krefeld, DE
• Rainer Protte · Dormagen, DE
• Alexander Meyer · Mülheim an der Ruhr, DE
• Karlheinz Hildenbrand · Krefeld, DE
• Raymond Wong · Norman, US
• Ice Zhang · Shanghai, CN

Key dates

• Filing date: Dec 12, 2009
• Grant date: Apr 29, 2014
• Expiry date: Oct 2, 2030

Classification

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

Abstract

This invention relates to an optical recording medium in which at least a recording layer and a light transmitting layer are sequentially formed on a substrate and in which the light is illuminated from the light transmitting layer side for recording and/or reproducing information signals, said substrate comprising an injection molded part, and said substrate having a Young's modulus E of at least 2.15 GPa and a Q factor of lower than 160 measured at 25° C. at 2000 Hz in accordance to ASTM E 756-05 05 and a transcriptability of the pit/groove structure of >85%.