Dynamic information storage or retrieval – Control of storage or retrieval operation by a control... – Mechanism control by the control signal
Reexamination Certificate
2006-09-19
2006-09-19
Edun, Muhammad (Department: 2656)
Dynamic information storage or retrieval
Control of storage or retrieval operation by a control...
Mechanism control by the control signal
C369S059110, C369S116000, C369S275100
Reexamination Certificate
active
07110335
ABSTRACT:
A write-once type optical recording medium is provided, which is low-cost and capable of maintaining the recording and reproducing stability high while enabling the relative ratio of read power to write power to be set high.The high-speed write-once type optical recording medium10includes a recording layer18that is constituted by laminating first and second subsidiary recording layers18A and18B each having one type of metal, for example Al and Sb respectively, as the main component. In the optical recording medium10having such constitution, the ratio between write power Pw and read power Pr, Pw/Pr is set to a value in the range of 2.0 to 8.0. When the recording layer18is irradiated with laser beam with a wavelength of 200 nm to 450 nm and a write power Pw of 2.5 to 5.0 mW at a recording-transferring rate of at least 35 Mps, Al and Sb contained in the subsidiary recording layers18A and18B respectively are diffused and mixed by the irradiation to form a recording mark that has a low reflectance, has been transformed to a single layer, and has been changed irreversibly.
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Mizushima Tetsuro
Yoshinari Jiro
Edun Muhammad
Oliff & Berridg,e PLC
TDK Corporation
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