KR20110067673A - Apparatus and method for controlling sled servo of optical disc drive - Google Patents

Apparatus and method for controlling sled servo of optical disc drive Download PDF

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Publication number
KR20110067673A
KR20110067673A KR1020090124365A KR20090124365A KR20110067673A KR 20110067673 A KR20110067673 A KR 20110067673A KR 1020090124365 A KR1020090124365 A KR 1020090124365A KR 20090124365 A KR20090124365 A KR 20090124365A KR 20110067673 A KR20110067673 A KR 20110067673A
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KR
South Korea
Prior art keywords
optical pickup
sled
optical
sled motor
motor
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KR1020090124365A
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Korean (ko)
Inventor
김종섭
Original Assignee
주식회사 히타치엘지 데이터 스토리지 코리아
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Priority to KR1020090124365A priority Critical patent/KR20110067673A/en
Publication of KR20110067673A publication Critical patent/KR20110067673A/en

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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/085—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam into, or out of, its operative position or across tracks, otherwise than during the transducing operation, e.g. for adjustment or preliminary positioning or track change or selection
    • G11B7/0857—Arrangements for mechanically moving the whole head
    • G11B7/08582—Sled-type positioners
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following

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  • Moving Of The Head For Recording And Reproducing By Optical Means (AREA)

Abstract

An apparatus and method for controlling a sled servo of an optical disc drive according to the present invention, for example, in an optical disc drive (ODD) that is not provided with a limit switch, the optical pickup to the initial position corresponding to the inner peripheral region of the optical disc In the case of performing the sled servo operation, the sled is moved by moving the optical pickup by a predetermined distance L from the current position in the outer direction and then again in the inner direction. Since an error in the back EMF detection operation of the motor can be effectively prevented, noise or an impact on the optical pickup due to an error in the sled servo operation can be prevented in advance.

Description

Apparatus and method for controlling sled servo of optical disc drive}

The present invention is, for example, a sled servo applied to various types of optical disc drives (ODDs) for recording or reproducing data on an optical disc such as a CD, a DVD, a BD, or the like. A control apparatus and method are provided.

In general, optical discs such as CDs, DVDs, BDs, and the like are widely used and used in optical disc drives (ODDs) that record or reproduce data on the optical discs. When the optical disk is inserted into the disk, the sled motor is rotated to move the position of the optical pickup in the innermost direction of the optical disk.

In addition, in the optical disk drive, the spindle motor is rotated at high speed, and the sled motor is rotated to move the optical pickup to a specific area such as a lead-in area of the optical disk. The navigation information recorded in the lead-in area is searched and read and stored in the memory.

The user can perform a data recording or reproducing operation desired by the user with reference to the navigation information stored in the memory. For example, as shown in FIG. 1, the optical disc drive includes an optical pickup at the innermost circumference of the optical disc. A limit switch 10 is provided for moving to the corresponding initial position.

Accordingly, when a new optical disk is inserted into the optical disk drive, a sled servo operation for moving the optical pickup in the innermost direction of the optical disk is performed. Then, the limit switch is turned off by the optical pickup. In the On state, the position of the optical pickup is moved from the position to the start position of the lead-in area of the optical disk by moving the position of the optical pickup by a predetermined distance in the circumferential direction of the optical disk.

On the other hand, in recent years, an optical disc drive that does not include the limit switch has been developed and released and commercialized. In an optical disc drive that does not include the limit switch, for example, as shown in FIG. 2, a new optical disc is provided. Is inserted, the sled motor is rotated to move the optical pickup in the inner circumferential direction of the optical disc.

In addition, after continuously detecting the inverse electromotive force (IEMF) generated by the rotation of the sled motor, calculating the position where the optical pickup is moved, and if the position corresponds to the start position of the lead-in area of the optical disc. In addition, a series of sled servo operations are performed to stop the sled motor.

However, for example, as shown in Fig. 3, even when a new optical disc is inserted in the state where the optical pickup is already located in the innermost region of the optical disc, the optical disc drive causes the optical pickup to carry out the optical pickup in the innermost direction of the optical disc. Since the conventional sled servo operation is performed to move the light, the noise is generated when the sled motor is rotated when an impact is applied to the optical pickup which can no longer be moved or when the counter electromotive force is not detected normally. There is a problem.

The present invention provides a sled servo operation for moving an optical pickup to an initial position corresponding to an inner circumferential specific area of an optical disk, for example, in an optical disk drive (ODD) not equipped with a limit switch. In this case, the present invention provides a sled servo control apparatus and method for an optical disk drive to efficiently prevent an error from occurring in the back electromotive force (IEMF) detection operation of the sled motor.

In the sled servo control method of an optical disk drive according to the present invention, when the optical disk drive performs a sled servo operation for moving the optical pickup to an initial position corresponding to an inner circumferential specific region of the optical disk, the sled motor is moved in the forward direction. Rotating the optical pickup by a predetermined distance in an outer circumferential direction; And rotating the sled motor in a reverse direction to move the optical pickup to an initial position corresponding to an inner circumferential specific region of the optical disc.

In addition, the optical disk drive is not provided with a limit switch separately, characterized in that the sled motor is a step motor,

The forward direction may be a rotation direction of a sled motor for moving the optical pickup in an outer circumferential direction, and the reverse direction may be a rotation direction of a sled motor for moving the optical pickup in an inner circumferential direction.

The initial position may be a start position of a lead-in area of the optical disc.

In addition, the first step, while rotating the sled motor in the forward direction, by detecting the back EMF generated from the sled motor, characterized in that for moving the optical pickup by a certain distance in the circumferential direction,

In the second step, the counter-electromotive force generated by the sled motor is detected while rotating the sled motor in the reverse direction, and the optical pickup is moved to an initial position corresponding to an inner circumferential specific region of the optical disc. ,

In addition, the sled servo control apparatus of the optical disk drive according to the present invention, the drive means for rotating the sled motor for moving the optical pickup included in the optical disk drive; And control means for operating the driving means to move the optical pickup to an initial position corresponding to an inner circumferential specific region of the optical disc, wherein the control means rotates the sled motor in a forward direction, After moving the optical pickup by a predetermined distance in the outer circumferential direction, by rotating the sled motor in the reverse direction, the optical pickup is moved to the initial position corresponding to the inner circumferential specific region of the optical disc,

In addition, the optical disk drive is not provided with a limit switch separately, characterized in that the sled motor is a step motor,

The forward direction may be a rotation direction of a sled motor for moving the optical pickup in an outer circumferential direction, and the reverse direction may be a rotation direction of a sled motor for moving the optical pickup in an inner circumferential direction.

The initial position may be a start position of a lead-in area of the optical disc.

The apparatus may further include detection means for detecting back electromotive force generated in the sled motor, and the control means may be configured to move the optical pickup at a predetermined distance in the circumferential direction based on the back electromotive force detected by the detection means. Characterized by moving as

The apparatus may further include detection means for detecting back electromotive force generated in the sled motor, and the control means may perform the optical pickup on the inner circumferential specific region of the optical disc based on the back electromotive force detected by the detection means. It is characterized by moving to the initial position corresponding to.

An apparatus and method for controlling a sled servo of an optical disc drive according to the present invention, for example, in an optical disc drive (ODD) that is not provided with a limit switch, the optical pickup to the initial position corresponding to the inner peripheral region of the optical disc In the case of performing the sled servo operation, the sled is moved by moving the optical pickup by a predetermined distance L from the current position in the outer direction and then again in the inner direction. Since an error in the back EMF detection operation of the motor can be effectively prevented, noise or an impact on the optical pickup due to an error in the sled servo operation can be prevented in advance.

Hereinafter, a preferred embodiment of the sled servo control apparatus and method of the optical disk drive according to the present invention will be described in detail with reference to the accompanying drawings.

The apparatus and method for controlling a sled servo according to the present invention is applied to various types of optical disk drives (ODDs) used in connection with a host such as a personal computer, or used independently of the host. do.

On the other hand, in the optical disk drive to which the present invention is applied, for example, as shown in Fig. 4, the optical disk 20, the optical pickup 21, the sled motor 22, the spindle motor 23, the motor driver 24, the counter electromotive force detection section 25, the controller 26, the reproduction / recording section 27, the memory 28, the interface section 29, and the like.

In addition, the sled motor 22 rotates a lead screw, for example, as shown in FIG. 5 to transfer the optical pickup 21 to the recording layer of the optical disk 20. When the sled motor 22 rotates in the reverse direction, for example, the optical pickup 21 moves in the inner circumferential direction of the optical disc. When the red motor 22 rotates in the forward direction, the optical pickup 21 moves in the outer direction of the optical disc.

In addition, the reverse electromotive force detector 25 detects an inverse electromotive force (IEMF) generated by the rotation operation of the sled motor 22. For example, the sled motor 22 A step motor that rotates in steps by the motor driver 24 is used.

In addition, when the sled motor 22 rotates, for example, 16 steps, it is assumed that the optical pickup 21 moves 2 mm by the lead screw. When the red motor 22 rotates one step, the optical pickup 21 moves 125 um.

The counter electromotive force detector 25 detects the counter electromotive force generated when the sled motor 22 rotates by one step and outputs a corresponding pulse signal to the controller 26. In 26, the position at which the optical pickup 21 is moved can be identified by referring to the pulse signal of the counter electromotive force.

On the other hand, when the controller 26 performs a sled servo operation to move the optical pickup 21 to an initial position corresponding to an inner circumferential specific region of the optical disk, the controller 26 operates the motor driver 24. By controlling, by rotating the sled motor 22 in the forward direction, the counter electromotive force generated by the sled motor is detected by the counter electromotive force detection unit 25, and the optical pickup 21 is outer periphery from the current position. It moves to a predetermined distance (L) in the direction of ().

In addition, the controller 26 controls the motor driver 24 to rotate the sled motor 22 in the reverse direction, while the sled motor 22 performs the reverse electromotive force detector 25. By detecting the generated back electromotive force (IEMF), the optical pickup is moved to the inner peripheral initial position corresponding to the inner peripheral specific area of the optical disk, for example, as shown in Figure 6, the rotation step of the sled motor And counter electromotive force are detected as pulse signals having correlation with each other.

7 and 8 illustrate an embodiment of the sled servo control method of the optical disk drive according to the present invention. For example, as shown in FIG. 7, the position of the optical pickup is a data area of the optical disk. When a new optical disc is inserted in a state near the center of the (Data Area), the controller 26 causes the optical pickup 21 to have an inner circumferential specific area of the optical disc, for example, a lead-in. The sled servo control mode for moving to the initial position of the inner circumference corresponding to the start position of the region is set.

When the sled servo control mode is set as described above, the controller 26 controls the motor driver 24 to rotate the sled motor 22 in the forward direction. 21) is moved in the outer direction by a predetermined distance L.

For example, the predetermined distance L is arbitrarily set by the experiment result value previously performed, and the number of pulse signals of the counter electromotive force generated by the forward rotation of the sled motor 22 (eg, N As a reference value corresponding to = 10), it may be stored and managed in advance in the memory 28.

In the controller 26, the pulse signal of the counter electromotive force detected by the counter electromotive force detection unit 25 is counted in the state in which the sled motor 22 is rotated in the forward direction, and the reference stored in the memory 28. When counting by the value, it is determined that the optical pickup has been moved in the circumferential direction by a predetermined distance L.

In addition, in the controller 26, when it is determined that the optical pickup has been moved by a predetermined distance in the outer circumferential direction as described above, the motor driver 24 is controlled to operate so as to rotate the sled motor 22 in the reverse direction. The optical pickup 21 is moved in the inner circumferential direction of the optical disc.

In the state in which the sled motor is rotated in the reverse direction as described above, the pulse signal of the counter electromotive force detected by the counter electromotive force detection unit 25 is counted so that the optical pickup has a preset inner peripheral position, for example, an optical disc. It is determined whether it has moved to the initial position of the inner circumference corresponding to the start position of the lead-in area of. The process of determining whether the movement to the initial position of the inner circumference is well known to those skilled in the art, and thus a detailed description thereof will be omitted. Let's do it.

In addition, when the position of the optical pickup is moved to the initial position of the inner circumference, the controller 26 performs the focus servo and the tracking servo operation, and then reproduces or records the data requested by the user. The operation will be performed normally.

On the other hand, for example, as shown in Fig. 8, even when a new optical disc is inserted in the state where the optical pickup 21 is already located in the innermost region of the optical disc which can no longer be moved, the controller 26 As described above, since the optical pickup is moved by a predetermined distance L in the outer circumferential direction of the optical disc, the optical pickup is moved back to the inner circumferential initial position. As described above with reference to FIG. When the shock is applied to the pickup or the counter electromotive force is not normally detected, noise can be effectively prevented from being generated by rotating the sled motor.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. , Alteration, substitution, addition, or the like.

1 illustrates an embodiment of a sled servo control operation of a general optical disk drive.

2 illustrates another embodiment of a sled servo control operation of a general optical disk drive.

3 illustrates an embodiment in which an error occurs by a sled servo control operation of a general optical disc drive.

4 shows a configuration of an embodiment of an optical disk drive to which the present invention is applied;

FIG. 5 illustrates a configuration of an embodiment of a lead screw and a sled motor included in an optical disk drive to which the present invention is applied.

6 shows a waveform diagram of an embodiment for counter electromotive force detected in accordance with the present invention;

7 and 8 illustrate embodiments of the sled servo control operation of the optical disk drive according to the present invention.

[Description of Drawings]

10: limit switch 11: optical pickup

20: optical disc 21: optical pickup

22: sled motor 23: spindle motor

24 motor driver 25 back electromotive force detection unit

26: controller 27: play / record

28: memory 29: interface unit

Claims (12)

In an optical disk drive, when performing a sled servo operation for moving an optical pickup to an initial position corresponding to an inner circumferential specific area of the optical disk, the sled motor is rotated in a forward direction to move the optical pickup by a predetermined distance in the circumferential direction. Stage 1; And And rotating the sled motor in a reverse direction to move the optical pickup to an initial position corresponding to an inner circumferential specific region of the optical disk. The method of claim 1, A limit switch is not provided separately in the optical disc drive, and the sled motor is a step motor. The method of claim 1, The forward direction is a rotation direction of a sled motor for moving the optical pickup in the outer circumferential direction, and the reverse direction is a rotation direction of a sled motor for moving the optical pickup in the inner circumferential direction. Sled servo control method. The method of claim 1, And the initial position is a start position of a lead-in area of the optical disc. The method of claim 1, In the first step, the sled servo control of the optical disk drive is characterized by detecting the counter electromotive force generated by the sled motor while moving the sled motor in the forward direction and moving the optical pickup by a predetermined distance in the circumferential direction. Way. The method of claim 1, In the second step, while rotating the sled motor in the reverse direction, by detecting the back EMF generated from the sled motor, and moving the optical pickup to the initial position corresponding to the inner peripheral region of the optical disk Sled servo control method. Driving means for rotating a sled motor for moving the optical pickup included in the optical disk drive; And And controlling means for operating the driving means to move the optical pickup to an initial position corresponding to an inner circumferential specific region of the optical disc. The control means rotates the sled motor in the forward direction, moves the optical pickup by a predetermined distance in the outer circumferential direction, and then rotates the sled motor in the reverse direction, so that the optical pickup corresponds to the inner circumferential specific region of the optical disc. Sled servo control device of an optical disk drive, characterized in that for moving to the initial position. The method of claim 7, wherein The optical disc drive is not provided with a limit switch separately, and the sled motor is a step motor of the optical disc drive, characterized in that the step motor. The method of claim 7, wherein The forward direction is a rotation direction of a sled motor for moving the optical pickup in the outer circumferential direction, and the reverse direction is a rotation direction of a sled motor for moving the optical pickup in the inner circumferential direction. Sled servo control device. The method of claim 7, wherein And the initial position is a start position of a lead-in area of the optical disc. The method of claim 7, wherein Further comprising a detection means for detecting the back electromotive force generated in the sled motor, And the control means moves the optical pickup by a predetermined distance in the circumferential direction based on the counter electromotive force detected by the detection means. The method of claim 7, wherein Further comprising a detection means for detecting the back electromotive force generated in the sled motor, And the control means moves the optical pickup to an initial position corresponding to an inner circumferential specific region of the optical disk, based on the counter electromotive force detected by the detection means.
KR1020090124365A 2009-12-15 2009-12-15 Apparatus and method for controlling sled servo of optical disc drive KR20110067673A (en)

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