Optical disk

Details Optical disk Optical disk

2007-11-13

2007-11-13

Young, Wayne (Department: 2627)

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

C369S283000

Reexamination Certificate

active

10491980

ABSTRACT:
The present invention provides an optical disc which is constituted by a substrate, a recording layer, and a protection layer and is irradiated with a laser beam from the protection layer side. The optical disc has the substrate whose diameter is greater than 50 mm, the recording layer provided on the substrate, and the protection layer which is layered on the recording layer and thinner than the substrate and on which a recording or reproducing laser beam is incident. The total thickness of the optical disc is 0.7 mm or more.

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