Optical information recording medium

Details Optical information recording medium Optical information recording medium

2005-10-25

2005-10-25

Cao, Allen (Department: 2652)

Dynamic optical information storage or retrieval

Optical storage medium structure

C369S286000

Reexamination Certificate

active

06959446

ABSTRACT:
A disk-shaped optical information recording medium comprising a recording layer, a pressure sensitive adhesive layer or an adhesive layer, and a cover sheet in this order on a substrate, and having a central hole, a track pitch of 300 to 600 nm and a groove depth of 40 to 150 nm, for recording and playing back information by being irradiated with a laser light at a wavelength of 500 nm or less, wherein the substrate and the cover sheet are closely adhered via the pressure sensitive adhesive layer or the adhesive layer at a region including a portion of an inner circumference vicinity and an outer circumference vicinity, and the maximum value for the radial length of the closer adhesion region is at least 0.4 mm.

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