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US 7,684,309 B2Granted
Multi-purpose high-density optical disc
AssigneeCinram International Inc.
InventorWilliam R. Mueller
Life of this patent
Estimating the term…
Abstract
An optical recording medium includes a first half-disc and a second half-disc. The first half-disc includes a substrate and an information layer (including a reflective layer) formed on a first side of the substrate. The second half-disc is bonded by an adhesive to a second side of the substrate of the first half-disc. In addition, a cover layer is formed over the first reflective layer. The cover layer has a thickness of approximately 0.1 mm. The substrate of the first half-disc has a thickness in a range of 0.3 mm to 1.0 mm. The first and second half-discs together have a combined thickness in a range of 0.8 mm to 1.3 mm.
Claims25
An optical recording medium comprising:
- a first half-disc including a substrate and a first information layer including a first reflective layer formed on a first side of said substrate;
- a second half-disc bonded by an adhesive to a second side of said substrate of the first half-disc;
- and
- a cover layer over said first reflective layer,
- wherein said cover layer has a thickness of approximately 0.1 mm, said substrate of said first half-disc has a thickness in a range of 0.3 mm to 1.0 mm, and said first and second half-discs together have a combined thickness in a range of 0.8 mm to 1.3 mm, and
- wherein said first half-disc is configured for reading of information marks on the first information layer using a light beam reflected from the information bearing first side of the first half-disc without a reading beam traveling through said adhesive and said substrate of the first half-disc.
3 more elements
A method for manufacturing an optical recording medium, the method comprising:
- (a) molding a substrate for a first half-disc, said substrate having a thickness in a range of 0.3 mm to 1.0 mm and an information bearing first side and a second side;
- (b) forming a first information layer for said first half-disc by forming a reflective layer over the information-bearing first side of the substrate;
- (c) forming a bond between a second half-disc at the second side of said substrate to said substrate of said first half-disc, wherein the first and second half-discs together have a combined thickness in a range of 0.8 mm to 1.3 mm and wherein die first half-disc is configured for reading information marks on the information layer using a light beam reflected from the information bearing first side of the first half-disc without a reading beam traveling through said bond and said substrate of the first half-disc;
- and
- (d) applying a cover layer over said information layer of said first half-disc, wherein said cover layer has a thickness of approximately 0.1 mm.
2 more elements
An optical recording medium comprising:
- a first half-disc including a substrate and a first information layer including a first reflective layer formed on a first side of said substrate;
- a second half-disc bonded by an adhesive to a second side of said substrate of the first half-disc;
- and
- a cover layer over said first reflective layer.
- wherein said cover layer has a thickness of approximately 0.1 mm, said substrate of said first half-disc has a thickness in a range of 0.3 turn to 1.0 mm, and said first and second half-discs together have a combined thickness in a range of 0.8 mm to 1.3 mm, and
- wherein the first half-disc is configured for reading information marks on the first information layer using a light beam reflected from the first side of the first half-disc without a reading beam traveling through said adhesive and said substrate of the first half-disc, and
- wherein said first half-disc includes only one information layer.
4 more elements
An optical recording medium comprising:
- a first half-disc including a substrate and a first information layer including a first reflective layer formed on a first side of said substrate;
- a second half-disc bonded by an adhesive to a second side of said substrate of the first half-disc;
- and
- a cover layer over said first reflective layer,
- wherein said cover layer has a thickness of approximately 0.1 mm, said substrate of said first half-disc has a thickness in a range of 0.3 mm to 1.0 mm, and said first and second half-discs together have a combined thickness in a range of 0.8 mm to 1.3 mm, and
- wherein the first half-disc is configured for reading information marks on the first information layer using a light beam reflected from the first side of the first half-disc without a reading beam traveling through said adhesive and said substrate of the first half-disc, and
- wherein said optical recording medium includes at least two read-only information layers.
4 more elements
An optical recording medium comprising:
- a first half-disc including a substrate and a first information layer including a first reflective layer formed on a first side of said substrate;
- a second half-disc bonded by an adhesive to a second side of said substrate of the first half-disc;
- and
- a cover layer over said first reflective layer,
- wherein said cover layer has a thickness of approximately 0.1 mm, said substrate of said first half-disc has a thickness in a range of 0.3 mm to 1.0 mm, and said first and second half-discs together have a combined thickness in a range of 0.8 mm to 1.3 mm, and
- wherein the first half-disc is configured for reading information marks on the first information layer using a light beam reflected front the first side of the first half-disc without a reading beam traveling through said adhesive and said substrate of the first half-disc, and
- wherein the first information layer is a plurality of pits and lands formed in said first side of said substrate of the first half-disc.
4 more elements
Dependencies are inferred from the claim text.