Optical disk drive with adaptive compensator
AssigneeVIA Technologies, Inc.
InventorsJia-Shing Sheu, Cheng-Hung Chen
Life of this patent
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Abstract
An optical disk drive for accessing data stored on a compact disc has a housing, a sled sliding inside the housing, a driving device for driving the sled, an actuator installed on the sled, a servo device for providing a push force to drive the actuator, a control circuitry for controlling operations of the optical disk drive, an adaptive compensator, and an error signal generation circuit. The actuator can move within a predetermined range on the sled, wherein the predetermined range includes a linear region and a non-linear region. It is desirable to keep the actuator within the linear region of the predetermined range. For this, an adaptive compensator is used to provide a supplementary force to the sled when the actuator is near the non-linear region.
Claims8
An apparatus for controlling speed of a pickup head comprising:
- a tracking compensator for driving a driving device of said pickup head;
- and
- an adaptive compensator for driving said driving device according to an error signal received by said pickup head so as to drive an actuator of said pickup head away from the non-linear region of a predetermined range on a sled.
A method for controlling speed of data access of a pickup head comprising:
- detecting whether an actuator on a sled approaches to a non-linear region of a predetermined range on said sled;
- and
- providing a supplementary force to drive said actuator away from said non-linear region.
A tracking method of a pickup head comprising:
- determining an adjustable supplementary force according to a reflected signal from a focusing error;
- and
- adding up said adjustable supplement force to adjust position of said pickup head for reducing a run-out effect of a disk.
Dependencies are inferred from the claim text.