Multi-layer optical information recording medium with pits...

Details Multi-layer optical information recording medium with pits... Multi-layer optical information recording medium with pits...

2006-11-14

2006-11-14

Huber, Paul W. (Department: 2653)

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

C369S283000

Reexamination Certificate

active

07136349

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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