Optical media manufactured with low-grade materials
AssigneeImation Corp.
InventorsJames M. DePuydt, Eric D. Levinson, Ramnath Subramaniam
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Abstract
This disclosure describes optical media that is compatible with conventional DVD drives. Unlike conventional DVDs, however, the described media uses a lower cost, lower quality material for one of the substrates. In particular, a so-called “dummy” substrate may comprise a non-optical grade polymeric material. In some cases, the dummy substrate may include post-consumer recycled materials, such as recycled polycarbonate. In other cases, dummy substrate may comprise a low cost non-optical grade polycarbonate, such as an industrial grade polycarbonate. In still other cases, the dummy substrate may comprise a polycarbonate blend, or other non-polycarbonate materials.
Claims34
An optical data storage medium compatible with a digital versatile disk (DVD) drive, the medium comprising:
- a first disk-shaped substrate comprising an optical grade thermoplastic material, the first disk-shaped substrate defining a first side and a second side, wherein the first side defines a data surface, wherein a laser of the DVD drive reads information associated with the data surface by interrogating light through the first disk-shaped substrate;
- and
- a second disk-shaped substrate defining a first side and a second side, wherein the second side of the second disk-shaped substrate is bonded to the first side of the first disk-shaped substrate, and wherein the second disk-shaped substrate comprises a non-optical grade thermoplastic material.
An optical data storage medium compatible with a digital versatile disk (DVD) drive, the medium comprising:
- a first disk-shaped substrate comprising an optical grade thermoplastic material, the first disk-shaped substrate defining a first side and a second side;
- and
- a second disk-shaped substrate defining a first side and a second side, wherein the second side of the second disk-shaped substrate is bonded to the first side of the first disk-shaped substrate, wherein the second side of the second disk-shaped substrate defines a data surface and wherein a laser of the DVD drive reads information associated with the data surface by interrogating light through the first disk-shaped substrate, and wherein the second disk-shaped substrate comprises a non-optical grade thermoplastic material.
An optical data storage medium compatible with a Blu-ray standard, the medium comprising:
- a substrate defining a first side and a second side, wherein the first side defines a data surface, and wherein the substrate comprises a non-optical grade, post-consumer recycled material;
- and
- a cover layer formed over the data surface.
Dependencies are inferred from the claim text.