Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Reexamination Certificate
2009-01-27
2011-12-20
Young, Wayne (Department: 2627)
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
C369S053410, C369S094000
Reexamination Certificate
active
08081548
ABSTRACT:
A multilayer optical recording medium having three or more information recording layers is irradiated with a laser beam, and a first signal obtained from the reflected laser beam is subjected to a frequency filter. A second signal obtained by filtration through a high-pass filter is used to evaluate the characteristics of the multilayer optical recording medium. In this manner, even in a multilayer optical recording medium having three or more information recording layers, the influence of the variation of the thickness and material of the information recording layers and the influence of the variation of the thickness of a spacer layer can be clearly determined and evaluated.
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patent: 2003/0095487 (2003-05-01), Nishizawa et al.
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Inoue Hiroyasu
Kikukawa Takashi
Mishima Koji
Nishiyama Tetsuya
Bernardi Brenda
Porzio, Bromberg & Newman P.C.
TDK Corporation
Young Wayne
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