Optical disk, recording/reproducing method thereof, and...

Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium

Reexamination Certificate

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Reexamination Certificate

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08064313

ABSTRACT:
Then, in order to achieve the above-described object, in the optical disk of the present invention, while micro-hologram layers7and8made of plural layers are provided in an inner portion of a plate body2along a thickness direction of the plate body2, dimensions of micro-holograms4along the thickness direction of the plate body2, which configure the micro-hologram layer7formed on the side of one surface of the plate body2within the micro-hologram layers7and8constructed of the plural layers, are made smaller than dimensions of micro-holograms3along the thickness direction of the plate body2, which configure a micro-hologram layer8formed on the side of an inner layer of the plate body2.

REFERENCES:
patent: 7388695 (2008-06-01), Lawrence et al.
patent: 2006/0280095 (2006-12-01), Tsukagoshi et al.
patent: 2008/0267039 (2008-10-01), Horinouchi et al.

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