Zoran Corporation

Oak Technology, Inc.

Hwee Chin Ong

Hubert Song

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.

Method and apparatus for providing focus control on a multi layer disc

The present invention is a method and system to provide adaptive control in an optical storage medium. The method comprises providing a beam of light, reflecting the beam of light off an optical disk and detecting the reflected beam. A value of the reflected beam is compared with a predetermined value, and an output signal is generated if the value of the reflected beam is greater than the predetermined value. A timing signal having a timing interval is generated and a control signal is generated if the output signal occurs over the timing interval. One of a current servo signal and a predetermined servo signal is provided in response to the control signal and a position of the light beam is controlled based on one of the current servo signal and the predetermined servo signal.

Method and apparatus for providing adaptive control of track servo

A method and apparatus provide positive lens position control when reading information from a disk storing data using a first and a second encoding format. When reading the data encoded in the second encoding format, the lens is maintained in a substantially stationary radial position with respect to the disk. When the data encoded in the second encoding format has an error, the lens position is changed to find a better position for reading the data.

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Sunnyvale, CA, United States of America

Hwee Chin Ong