Optical recording medium having dual information surfaces

Details Optical recording medium having dual information surfaces Optical recording medium having dual information surfaces

2005-08-23

2005-08-23

Dinh, Tan (Department: 2653)

Dynamic information storage or retrieval

Systems having plural physically distinct independent tracks...

Having layered storage medium

C369S275100

Reexamination Certificate

active

06934238

ABSTRACT:
A reproduction apparatus is provided for reproducing information stored on an optical medium. The apparatus includes a light source for illuminating the optical medium, the optical medium having at least one surface containing information stored thereon; a focusing arrangement operable to focus the light source on the at least one surface containing information thereon; and a detection arrangement operable to detect the information stored on the optical medium. The optical medium includes a first substrate having a first information surface; a semitransparent reflection film formed on the first information surface of the first substrate; a second substrate having a second information surface; a reflection film formed on the second information surface of the second substrate; and an adhesive layer for adhering the first substrate and the second substrate so that the first information surface and the second information surface face each other, wherein the thickness of the first substrate is at least 0.56 mm, the thickness of the adhesive layer is at least 30 μm, the total thickness of the first substrate and the adhesive layer is in the range of 0.59 mm to 0.68 mm, and the semitransparent reflection film includes gold.

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