Dynamic information storage or retrieval – Control of storage or retrieval operation by a control... – Mechanism control by the control signal
Reexamination Certificate
2007-07-17
2007-07-17
Edun, Muhammad (Department: 2627)
Dynamic information storage or retrieval
Control of storage or retrieval operation by a control...
Mechanism control by the control signal
C369S047530, C369S112010, C369S044410
Reexamination Certificate
active
10773438
ABSTRACT:
In an optical recording medium having two information recording layers, a highly reliable recording can be conducted in one of the recording layers in the back regardless of the recording state of the other recording layer closer to the side of the disc on which light is incident. A first photodetector115detects reflected light from a recording layer103in the back when the light is focused thereon. A second photodetector116is disposed outside the periphery of the first photodetector115and detects reflected light from a recording layer105located in front. When recording in the recording layer in the back, the write power is controlled in accordance with the output level of the second photodetector.
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Japanese Office Action, Dated May 9, 2006,.2 Total Pages.
Office Action from the Japanese Patent Office dated Feb. 14, 2006 (in Japanese).
Kurokawa Takahiro
Miyamoto Harukazu
A. Marquez, Esq. Juan Carlos
Edun Muhammad
Fisher Esq. Stanley P.
Hitachi , Ltd.
Reed Smith LLP
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