Optical recording medium, information recording apparatus...

Details Optical recording medium, information recording apparatus... Optical recording medium, information recording apparatus...

2006-03-24

2010-12-07

McPherson, John A (Department: 1795)

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

C428S064100

Reexamination Certificate

active

07848215

ABSTRACT:
An optical-recording medium is provided with at least a first recording layer for recording information optically; and a second recording layer for recording information optically by a light beam that passes through said first recording layer; wherein the track pitch of a recording track that is formed on said second recording layer is narrower than the track pitch of a recording track that is formed on said first recording layer.

REFERENCES:
patent: 7037565 (2006-05-01), Yamaguchi
patent: 2004/0246869 (2004-12-01), Dierks
patent: 2003-141775 (2003-05-01), None
patent: 2004-079071 (2004-03-01), None
patent: 2005-062091 (2005-03-01), None
patent: 2006-127732 (2006-05-01), None
Translation JP-2003-141775(May 2003).
Translation JP-2004-079071(Mar. 2004).
Japanese Patent Office Action dated Feb. 3, 2009.
Japanese Patent Office Action dated Jun. 9, 2009.

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