Back to results
US 6,724,698 B1Granted
Information storage device having uniaxial tracking mechanism with decelaration control
AssigneeFujitsu Limited
InventorsTakayuki Kawabe, Ichiro Watanabe
Life of this patent
Estimating the term…
Abstract
An information storage device having a uniaxial tracking mechanism as a pickup which can perform a stable track pull-in operation is provided. A deceleration pulse amplitude á supplied to a tracking actuator is determined from a linear function á=K(V−V0) of a detected movement velocity of a beam in the vicinity of a target track. The deceleration pulse amplitude is divided into two, and is supplied to the tracking actuator on two different occasions.
Claims11
An information storage device comprising:
- a tracking actuator which moves a carriage to track and follow a target track;
- a deceleration pulse generating unit which generates a deceleration pulse;
- and
- a deceleration control unit which supplies the deceleration pulse to the tracking actuator a plurality of times between a seek control operation for seeking a target track and a tracking control operation for scanning the target track with a light beam.
1 more element
An information storage device comprising:
- a tracking actuator;
- a deceleration pulse generating unit which generates a deceleration pulse;
- a deceleration control unit which supplies the deceleration pulse to the tracking actuator a plurality of times between a seek control operation for seeking a target track and a tracking control operation for scanning the target track with a light bean;
- a seek control signal generating unit which generates a seek control signal for controlling the tracking actuator so that the beam moves at a predetermined velocity;
- a low frequency element extracting unit which extracts a low frequency element from the seek control signal by the low frequency element extracting unit to the deceleration pulse.
2 more elements
An information storage device comprising:
- a tracking actuator;
- a deceleration pulse generating unit which generates a deceleration pulse;
- and
- a deceleration control unit which supplies the deceleration pulse to the tracking actuator a plurality of times between a seek control operation for seeking a target track and a tracking control operation for scanning the target track with a light beam;
- wherein said deceleration pulse generating unit detects a movement velocity of the beam, and determines an amplitude of the deceleration pulse to be supplied to the tracking actuator as a linear function of the detected movement velocity, and
- the deceleration pulse generating unity comprises a multiplying unit which multiples the detected movement velocity by a predetermined constant.
3 more elements
An information storage device comprising:
- a tracking actuator which moves a carriage to track and follow a target track;
- deceleration pulse generating means for generating a deceleration pulse;
- and
- a deceleration control unit, responsive to said deceleration pulse generating means, for supplying the deceleration pulse to said tracking actuator a plurality of times between a seek control operation which seeks the target track on a recording medium and a tracking control operation which scans the target track by a light beam.
1 more element
Dependencies are inferred from the claim text.