Dynamic information storage or retrieval – Storage medium structure – Layered
Reexamination Certificate
2006-10-03
2006-10-03
Huber, Paul W. (Department: 2627)
Dynamic information storage or retrieval
Storage medium structure
Layered
C369S094000
Reexamination Certificate
active
07116631
ABSTRACT:
In an optical information recording medium having at least two information layer, guide grooves for tracking or sample pits or information pits corresponding to information signals are formed on a surface of a first substrate. A first information layer formed by a thin film for reflecting a portion of a light beam made incident on the first substrate and permitting penetration of a portion of the light beam is formed on a surface of the first substrate. Guide grooves for tracking or information pits corresponding to information signals are formed on a surface of a second substrate. A second information layer having a reflectance higher than that of the first information layer is formed on a surface of the second substrate. Between the first information layer and the second information layer, there is formed a transparent separation layer for positioning the first information layer and the second information layer to be spaced a predetermined distance apart from each other.
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Akahira Nobuo
Nagata Ken'ichi
Nishiuchi Ken'ichi
Hamre Schumann Mueller & Larson P.C.
Huber Paul W.
Matsushita Electric - Industrial Co., Ltd.
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