Dynamic information storage or retrieval – Storage medium structure – Optical track structure
Reexamination Certificate
2005-11-28
2009-08-25
Agustin, Peter Vincent (Department: 2627)
Dynamic information storage or retrieval
Storage medium structure
Optical track structure
C369S275200
Reexamination Certificate
active
07580340
ABSTRACT:
An optical recording medium and a method for testing that optical recording medium are provided, which can prevent degradation of a reproduction signal in the case where the optical recording medium is stored at a high temperature for a long time, which enables stable recording and reproduction of data before and after the high-temperature storage, and which can achieve high-speed recording and increase of recording density. In the optical recording medium, a reproduction signal output of a recording mark after high-temperature storage that is formed in a recording layer after the optical recording medium is stored at a storage temperature t in a range from 60° C. to 90° C. for at least 50−(4/3)(t−60) hours is 0.9 times or more a reproduction signal output of a recording mark before the high-temperature storage that has the same bit length as the recording mark after the high-temperature storage and is formed before the above high-temperature storage.
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Miura Hideaki
Shingai Hiroshi
Yoshinari Jiro
Agustin Peter Vincent
Oliff & Berridg,e PLC
Sasinowski Andrew J
TDK Corporation
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