Player with a read-head yoke for double-sided optical discs
First Claim
Patent Images
1. An optical disc player for playing an optical disc having a first side and a second side, wherein data is arranged on a data layer of said first side along a first spiral oriented in a first direction and data is arranged on a data layer of said second side along a second spiral oriented in a direction opposite to that of said first spiral when viewed on the respective sides, said player comprising:
- a laser head reading data from the optical disc;
a laser head controller controlling the movement of said laser head;
a yoke selectively moving the laser head from one side of the optical disc to the other in response to commands from the laser head controller;
a motor rotating the optical disc in the same direction independently of whether the laser head is on one side of the optical disc or the other; and
a data buffer buffering data received from the laser head.
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Abstract
A player for an optical disc, such as a DVD-18 disc, is provided with a laser read head, a yoke for selectively switching the head from one side of the optical disc to the other, and a motor that rotates the optical disc in the same direction independently of which side is being read.
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Citations
21 Claims
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1. An optical disc player for playing an optical disc having a first side and a second side, wherein data is arranged on a data layer of said first side along a first spiral oriented in a first direction and data is arranged on a data layer of said second side along a second spiral oriented in a direction opposite to that of said first spiral when viewed on the respective sides, said player comprising:
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a laser head reading data from the optical disc;
a laser head controller controlling the movement of said laser head;
a yoke selectively moving the laser head from one side of the optical disc to the other in response to commands from the laser head controller;
a motor rotating the optical disc in the same direction independently of whether the laser head is on one side of the optical disc or the other; and
a data buffer buffering data received from the laser head. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An optical disc player and an optical disc combination, said optical disc having a first side with top and bottom layers, each layer having a respective track along a first spiral, and a second side with top and bottom layers, each layer having a respective track extending along a second spiral, said first and second spirals being oriented in opposite directions as viewed from the respective sides, said combination comprising:
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a laser head reading data from said optical disc;
a yoke selectively moving the laser head from one side of said optical disc to the other;
a laser head controller controlling the movement of said laser head across the surfaces of said optical disc and from one side of said optical disc to the other; and
a motor rotating the optical disc in a direction independent of the position of said laser head. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method of reading an optical disc having a first side with a track with data extending between the hub and the periphery of the optical disc along a first spiral;
- and a second side having a track with data extending between the hub and the periphery of the disc along a second spiral, said first and second spirals being oriented in opposite directions as viewed from the respective sides, comprising;
providing a laser head;
moving said laser head across the first side to read data;
switching said laser head to said second side;
moving said laser head across the second side to read data; and
rotating said optical disc in the same direction while the data is read from said first and said second sides. - View Dependent Claims (19, 20, 21)
- and a second side having a track with data extending between the hub and the periphery of the disc along a second spiral, said first and second spirals being oriented in opposite directions as viewed from the respective sides, comprising;
Specification