Optical storage medium with improved substrate structure to provide uniform signal quality
AssigneeNEC Corporation
InventorsShuichi Okubo, Tatsunori Ide
Life of this patent
Estimating the term…
Abstract
An optical storage medium includes a substrate having grooves and lands. A first dielectric layer overlies the substrate. A recording layer overlies the first dielectric layer. A second dielectric layer overlies the recording layer, and a light transmitting layer overlying the second dielectric layer. Each of the grooves is larger in width than adjacent two of the lands.
Claims18
A substrate structure for an optical storage medium including a recording layer, said substrate including grooves and lands,
- wherein each of said grooves is larger in width than adjacent two of said ands, and
- wherein a groove width WG of said grooves and a land width WL of said lands satisfy 0.0011d−0.06<2(WG−WL)/(WG+WL)<0.0011d+0.32, where “d” is a distance between said substrate and said recording layer.
A substrate structure for an optical storage medium including a recording layer, said substrate including grooves and lands,
- wherein each of said grooves is larger in width than adjacent two of said lands, and
- wherein a substrate groove width “WG” of said grooves, a substrate land width “WL” of said lands are set to satisfy the equation:
- ω<(WG+WL)<1.7ω, where “ω” is a diameter of a laser beam spot on said optical storage medium.
An optical storage medium including:
- a substrate having grooves and lands;
- a first dielectric layer overlying said substrate;
- a recording layer overlying said first dielectric layer;
- a second dielectric layer overlying said recording layer;
- and
- a light transmitting layer overlying said second dielectric layer,
- wherein each of said grooves is larger in width than adjacent two of said lands, and
- wherein a groove width WG of said grooves and a land width WL of said lands satisfy 0.0011d−0.06<2(WG−WL)/(WG+WL)<0.0011d+0.32, where “d ”is a distance between said substrate and said recording layer.
An optical storage medium including:
- a substrate having grooves having a uniform groove width WG and lands having a uniform land width WL;
- a first dielectric layer overlying said substrate;
- a recording layer overlying said first dielectric layer;
- a second dielectric layer overlying said recording layer;
- and
- a light transmitting layer overlying said second dielectric layer,
- wherein sad groove width WG and said land width WL satisfy 0.0011d−0.06<2(WG−WL)/(WG+WL)<0.0011d+0.32, where “d” is a distance between said substrate and said recording layer.
Dependencies are inferred from the claim text.