Apparatus and method for controlling tracking in disc drive by monitoring tracking actuator deviation
AssigneeSamsung Electronics Co., Ltd.
InventorJung-bum Suh
Life of this patent
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Abstract
An apparatus and method of controlling tracking in a disc drive using a tracking actuator, a feed motor, and an objective lens, including monitoring whether the tracking actuator deviates from a dynamic range based on a signal controlling the feed motor when tracking is performed; and returning the objective lens connected to the tracking actuator to a neutral point when it is determined that the tracking actuator deviates from the dynamic range.
Claims9
A method of controlling tracking in a disc drive using a tracking actuator, a feed motor, and an objective lens comprising:
- monitoring whether the tracking actuator deviates from a dynamic range based on a signal controlling the feed motor when tracking is performed, wherein the monitoring comprises comparing the signal controlling the feed motor with a predetermined reference value, and determining that the tracking actuator deviates from the dynamic range when the signal controlling the feed motor is greater than the predetermined reference value for a predetermined time;
- and
- returning the objective lens connected to the tracking actuator to a neutral point directly in response to the determining that the tracking actuator deviates from the dynamic range,
- wherein the predetermined reference value is set based on the dynamic range and a movable range of the tracking actuator.
A tracking control apparatus for a disc drive having a tracking actuator, an objective lens connected to the tracking actuator, and a feed motor, the tracking control apparatus comprising:
- an optical pickup outputting a radio frequency signal from a signal picked up from a disc loaded in the disc drive when the disc drive is driven;
- a radio frequency amplifier outputting a tracking error signal detected from the radio frequency signal;
- a servo control unit outputting a control signal for driving the tracking actuator and the feed motor based on the tracking error signal output from the radio frequency amplifier;
- and
- a control unit monitoring the control signal for driving the feed motor output from the servo control unit,
- wherein the control unit compares the control signal for driving the feed motor with a predetermined reference value, and, when the control signal is greater than the predetermined reference value for a predetermined time, determines that the tracking actuator deviates from the dynamic range and, directly in response to determining that the tracking actuator deviates from a dynamic range, controls the servo control unit to return the objective lens connected to the tracking actuator to a reference position,
- wherein the predetermined reference value is set based on the dynamic range and a movable range of the tracking actuator.
A tracking control apparatus for a disc drive having a tracking actuator, an objective lens connected to the tracking actuator, and a feed motor, the tracking control apparatus comprising:
- a servo control unit receiving a tracking error signal based upon a signal from a disc in the disc drive and outputting a control signal for driving the tracking actuator and the feed motor;
- a control unit monitoring the control signal for driving the feed motor, wherein the control unit compares the control signal for driving the feed motor with a predetermined reference value, and, when the control signal is greater than the predetermined reference value for a predetermined time, determines that the tracking actuator deviates from a dynamic range, and the control unit further directly controls the servo control unit to return the tracking actuator to a reference position when the controller determines that the tracking actuator deviates from the dynamic range;
- and
- a tracking actuator driver that drives the tracking actuator using the control signal output from the servo control unit to move the objective lens in a tracking or radial direction of the disc,
- wherein the predetermined reference value is set based on the dynamic range and a movable range of the tracking actuator.
Dependencies are inferred from the claim text.