# US 6,724,698 B1 · Information storage device having uniaxial tracking mechanism with decelaration control

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- Number: US 6,724,698 B1
- Document ID: US6724698B1
- Status: Granted
- Kind: B1
- Application number: 09/495,233
- Filed: 2000-01-31
- Granted: 2004-04-20
- Earliest claimed: 1999-03-31
- Assignees: Fujitsu Limited
- Inventors: Takayuki Kawabe; Ichiro Watanabe
- Web page: https://patentgrep.com/patent/US6724698B1

## CPC

- G11B 7/08529: {Methods and circuits to control the velocity of the head as it traverses the tracks}
- G11B 7/08517: {with tracking pull-in only}
- G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R)

## 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.

## Claims

### Claim 1

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.

### Claim 2 (depends on 1)

The information storage device as claimed in claim 1, wherein the tracking actuator performs both the seek control operation and the tracking control operation.

### Claim 3 (depends on 1)

The information storage device as claimed in claim 1, wherein a pulse height of said deceleration pulse is dependent on a seek speed.

### Claim 4 (depends on 1)

The information storage device as claimed in claim 1, wherein said deceleration pulse has a predetermined pulse width.

### Claim 5

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.

### Claim 6

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.

### Claim 7 (depends on 6)

The information storage device as claimed in claim 6, wherein the deceleration pulse generating unit further comprises an adding unit which adds a predetermined offset value to the detected movement velocity, and supplies the addition result to the multiplying unit.

### Claim 8 (depends on 6)

The information storage device as claimed in claim 6, wherein the deceleration pulse generating unity outputs the deceleration pulse having a predetermined constant pulse width.

### Claim 9

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.

### Claim 10 (depends on 9)

The information storage device as claimed in claim 9, wherein a pulse height of said deceleration pulse is dependent on a seek speed.

### Claim 11 (depends on 9)

The information storage device as claimed in claim 9, wherein said deceleration pulse has a predetermined pulse width.