Dynamic information storage or retrieval – Storage medium structure – Optical track structure
Reexamination Certificate
2005-10-18
2009-12-29
Dinh, Tan X (Department: 2627)
Dynamic information storage or retrieval
Storage medium structure
Optical track structure
Reexamination Certificate
active
07639593
ABSTRACT:
A multi-layer optical recording medium in which an effect of an interlayer crosstalk can be accurately measured and a method for evaluating a recording system using the same are provided. The multi-layer optical recording medium has a signal intensity measuring region formed in advance such that each recording layer having an identical address is allowed to have a different reflectivity. A signal intensity variation occurring when data recorded on the signal intensity measuring region is reproduced is measured to obtain signal intensity variation information. The method calculates a coherence parameter m describing the coherence of a recording system from the signal intensity variation information and reflectivity information obtained at each of the recording layers without interference from the other recording layers.
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Mishima Koji
Tsukagoshi Takuya
Yoshitoku Daisuke
Dinh Tan X
Oliff & Berridg,e PLC
TDK Corporation
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