Method and apparatus for providing focus control on a multi layer disc
AssigneeZoran Corporation
InventorsHubert Song, Hwee Chin Ong
Life of this patent
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Abstract
The present invention is a method and system to provide focus control in a multi-layer optical storage medium. The method comprises generating a beam of light and reflecting the beam of light off one of a first and a second optical layers on a disk. The reflected beam is detected and a servo signal is provided in response to the reflected beam. The light source is directed to move from a first position to a second position based on the servo signal, so as to focus the light source from one of the first or the second optical layer to another one of the first or the second optical layer.
Claims20
A system for providing focus control in a multi-layer optical storage medium, comprising:
- a light source that generates a beam of light;
- an optical disk having a first and a second optical layer, the optical disk reflects the beam of light off one of said first and said second optical layers;
- a detector for receiving the reflected beam;
- a controller circuit coupled to the detector, said control circuit to provide a servo signal in response to said reflected beam;
- and
- a driver circuit coupled to said controller circuit and said light source, said driver circuit to direct said light source to move from a first position to a second position based on said servo signal, so as to focus said light source from one of said first or said second optical layer to another one of said first or said second optical layer.
A method for providing focus control in a multi-layer optical storage medium, comprising:
- generating a beam of light;
- reflecting said beam of light off one of a first and a second optical layers on a disk;
- detecting the reflected beam;
- providing a servo signal in response to said reflected beam;
- and
- directing said light source to move from a first position to a second position based on said servo signal, so as to focus said light source from one of said first or said second optical layer to another one of said first or said second optical layer.
Dependencies are inferred from the claim text.