Double-sided optical disc
First Claim
Patent Images
1. An optical data disc comprising:
- a first side and a second side, each side including a first data layer and a second data layer;
wherein data are arranged on the data layers of said first side along first spirals oriented in a first direction when viewed on said first side, and data are arranged on the data layers of said second side along second spirals oriented in a direction opposite that of said first spirals when viewed on said second side.
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Abstract
A double-sided optical disc, is formed with data tracks on each layer. The tracks on one side follow one spiral while the tracks on the other side follow a second spiral, the two spirals being oriented in opposite directions as viewed from the respective sides, and therefore being mirror images of each other. This allows data to be read by a player seamlessly from both sides of the disc without changing the direction of rotation of the disc.
118 Citations
29 Claims
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1. An optical data disc comprising:
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a first side and a second side, each side including a first data layer and a second data layer;
wherein data are arranged on the data layers of said first side along first spirals oriented in a first direction when viewed on said first side, and data are arranged on the data layers of said second side along second spirals oriented in a direction opposite that of said first spirals when viewed on said second side. - View Dependent Claims (2, 3, 4)
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5. An optical disc comprising:
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a first side with top and bottom layers, each layer having a respective track extending between the hub and the periphery of the disc along a first spiral; and
a second side having a top layer with a track extending between the hub and the periphery of the disc along a second spiral;
wherein said first and second spirals are oriented in opposite directions as viewed from their respective sides. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. An optical data disc comprising:
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a first side and a second side, each side including a data layer;
wherein data are arranged on the data layers of said first side along a first spiral oriented in a first direction when viewed on said first side, and data are arranged on the data layer of said second side along a second spiral oriented in a direction opposite that of said first spirals when viewed on said second side. - View Dependent Claims (17, 18, 19)
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20. A method of storing data on an optical disc having two sides, comprising:
placing the data in tracks on respective sides, said tracks being disposed along spirals, with the track on one side being disposed along a first spiral oriented in a first direction and the tracks on the other side being disposed along a second spiral oriented in a direction that is opposite to said first direction, as viewed normally from the respective sides. - View Dependent Claims (21, 22, 23)
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24. An optical data disc comprising:
a first side and a second side, each side including a data layer with a data track, the data track of said first side being disposed along a first spiral oriented in a first direction when viewed on said first side, and the data track on the second side being disposed along a second spiral oriented in a direction opposite that of said first spiral when viewed on said second side. - View Dependent Claims (25, 26, 27, 28, 29)
Specification