Patent · US Active

Disc-shaped high-density recording mediums

US7993721B2 · kind B2 · utility

0Cited by

8References

15Claims

0Family size

Assignee

Bayer MaterialScience AG · DE

Inventors

Friedrich-Karl Bruder · Krefeld, DE
Wilfried Haese · Rheydt, DE
Rafael Oser · Krefeld, DE
Jan Wiekard · Odenthal, DE
Wolfgang Fischer · Meerbusch, DE
Rainer Protte · Dormagen, DE
Joerg Wehrle · Remagen, DE
Karlheinz Hildenbrand · Krefeld, DE

Key dates

Filing date	Oct 17, 2008
Grant date	Aug 9, 2011
Priority date	—
Expiry date	Jan 29, 2030

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/21
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

Optical recording mediums comprising a substrate and a recording layer and a light transmitting layer sequentially disposed on the substrate; wherein the substrate comprises one or more parts selected from the group consisting of injection molded parts, injection molded sandwich structures having a molded surface layer and a molded core layer or two injection molded parts which are UV-bonded, and combinations thereof; and wherein the substrate has 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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.