KR20150015649A - Optical disk drive and method for controlling data writing of the optical disk drive - Google Patents

Optical disk drive and method for controlling data writing of the optical disk drive Download PDF

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Publication number
KR20150015649A
KR20150015649A KR1020130091099A KR20130091099A KR20150015649A KR 20150015649 A KR20150015649 A KR 20150015649A KR 1020130091099 A KR1020130091099 A KR 1020130091099A KR 20130091099 A KR20130091099 A KR 20130091099A KR 20150015649 A KR20150015649 A KR 20150015649A
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KR
South Korea
Prior art keywords
focus balance
signal
point
reference point
recording
Prior art date
Application number
KR1020130091099A
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Korean (ko)
Inventor
양승택
Original Assignee
도시바삼성스토리지테크놀러지코리아 주식회사
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Application filed by 도시바삼성스토리지테크놀러지코리아 주식회사 filed Critical 도시바삼성스토리지테크놀러지코리아 주식회사
Priority to KR1020130091099A priority Critical patent/KR20150015649A/en
Publication of KR20150015649A publication Critical patent/KR20150015649A/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
    • G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
    • G11B7/0045—Recording
    • G11B7/00456—Recording strategies, e.g. pulse sequences
    • 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
    • G11B7/0908—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 for focusing only
    • G11B7/0917—Focus-error methods other than those covered by G11B7/0909 - G11B7/0916
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/12—Formatting, e.g. arrangement of data block or words on the record carriers
    • G11B2020/1264—Formatting, e.g. arrangement of data block or words on the record carriers wherein the formatting concerns a specific kind of data
    • G11B2020/1265—Control data, system data or management information, i.e. data used to access or process user data
    • G11B2020/1267—Address data

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  • Optical Recording Or Reproduction (AREA)

Abstract

An optical disc drive and its recording control method are disclosed. According to another aspect of the present invention, there is provided a recording control method for an optical disc drive, the method comprising: detecting an RF signal; recording data while changing a write focus balance value in a disc area if there is no detected RF signal; Searching for a recorded area, detecting RF signals while changing a write focus balance value for a searched area, searching for a point at which a level becomes the highest among the detected RF signals, setting a detected point as a reference point, And adjusting the write focus balance around the reference point.

Description

TECHNICAL FIELD [0001] The present invention relates to an optical disk drive, and more particularly,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk drive, and more particularly, to a recording control technique for improving recording quality in a rewritable optical disk.

In general, a disc used as a storage medium of the optical disc drive may be a write-once optical disc such as a CD-ROM (Compact Disc-Read Only Memory) or a CD-R A rewritable optical disc such as a compact disc-rewritable (CD-RW), and the like. These various types of discs have distinctive uses and have become popular in recent years. In addition, as a large-capacity disk such as a DVD has been developed, it has been developed as a medium for recording various types of video or audio data as well as PC data as a computer (PC) peripheral device.

Development of recording control technology is required to guarantee the write quality of such various optical disks. One of the recording control techniques is to adjust the write focus balance before data recording. However, at the time of light focus balance adjustment for recording quality assurance, the reference point is fixed or the process adjustment value is used as a reference point. In this case, the reference points are collectively the same irrespective of the state of the optical disk or the surrounding environment. The reference point can not be said to be the optimum point for the adjustment of the light focus balance, .

According to an embodiment, an optical disk drive and a recording control method thereof for assuring an optimum recording quality are proposed.

According to an embodiment of the present invention, there is provided a recording control method for an optical disc drive, the method comprising: detecting an RF signal; recording data while changing a write focus balance value in a disc area if there is no detected RF signal; Detecting RF signals while changing a write focus balance value for a searched area and searching for a point at which a level becomes maximum among the detected RF signals; setting a detected point as a reference point, And adjusting the light focus balance to the center.

The recording control method of the optical disc drive may further include adjusting a gain for detecting the RF signal before the step of recording the data if there is no detected RF signal.

In the step of adjusting the write focus balance, a point at which the error rate becomes minimum while adjusting the write focus balance value around the reference point can be selected as the recording point.

A recording control method for an optical disk drive includes a step of adjusting a write focus balance while reproducing data if there is a detected RF signal, and a step of setting a adjusted point as a reference point, And adjusting the write focus balance. The method may further include recording data in a state in which the write focus balance is adjusted.

According to another aspect of the present invention, there is provided an optical disc drive comprising: an RF signal processing unit for detecting and processing an RF signal; and a control unit for changing the write focus balance value to an area of the disc if there is no RF signal detected through the RF signal processing unit The RF signal processing unit detects RF signals while changing the write focus balance value for the searched area, and sets a point at which the level becomes the maximum among the detected RF signals as a reference point And a control unit for adjusting the write focus balance around the set reference point.

If there is no detected RF signal, the control unit can adjust the gain for detecting the RF signal before the step of recording the data. The control unit can select the point at which the error rate becomes minimum as the recording point while adjusting the write focus balance value around the reference point. The control unit adjusts the write focus balance while reproducing the data, sets the adjusted point as a reference point, and adjusts the write focus balance around the later set reference point. Further, the control section can record data in a state in which the write focus balance is adjusted.

The optical disc drive further includes a memory for storing position information about a reference point set by the control unit. The control unit grasps the position of the reference point by using the position information on the reference point stored in the memory, Balance can be adjusted.

According to the embodiment, even in the case where there is no RF signal in the rewritable optical disk, optimum recording quality can be ensured. For example, when there is no RF signal such as a blank disc, after writing data to the disc area while changing the write focus balance value, the maximum point of the RF signal level is found, and that point is set as a reference point, By performing focus balance adjustment, the signal and recording quality can be optimized at the same time. Further, it is possible to solve the problem of the recording quality of the old one and to prevent the defective disc in the market. Furthermore, tuning time for media response is reduced and drive development time is shortened.

1 is a configuration diagram of an optical disc drive according to an embodiment of the present invention;
FIG. 2 is a reference diagram illustrating a write focus balance adjustment process of an optical disk drive according to an embodiment of the present invention. FIG.
3 is a graph showing a point where the RF signal level is maximized according to the write focus balance adjustment of the optical disc drive according to the embodiment of the present invention,
4 is a flowchart illustrating a recording control method of an optical disc drive according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention of the user, the operator, or the custom. Therefore, the definition should be based on the contents throughout this specification.

1 is a configuration diagram of an optical disc drive according to an embodiment of the present invention.

1, the optical disc drive includes an optical disc 110, an optical pickup 120, an RF signal processor 130, an optical driver 140, an encoder 150, a digital signal processor 160, a memory 170 A control unit 180, a servo unit 190, a driving unit 200, a spindle motor 210, and a sled motor 220.

The optical disc 110, which is a storage medium that can be used in the optical disc drive, includes a CD (Compact Disc), a DVD (Digital Versatile Disc), and a BD (Blu-ray Disc), and the present invention particularly relates to a rewritable optical disc will be.

The optical pickup 120 projects an optical signal onto the optical disk 110 according to an optical driving signal generated by the optical driving unit 140 and detects an optical signal reflected from the optical disk 110. The RF signal processing unit 130 generates an RF signal RF, a focus error signal FE, and a tracking error signal TE, which are analog signals, from the signal detected by the optical pickup 120 . After shaping the generated signal, the signal is transformed into a binary signal and output to a digital signal processor 160.

The optical driver 140 outputs an optical drive signal for data recording in a write mode. At this time, the optical driver 140 may apply an adjusted write focus balance value through a Write Focus Balance (WFB) calibration process and output an optical drive signal according to an input signal. In the read mode, the optical driver 140 outputs an optical drive signal for generating a predetermined level of laser power. The encoder 150 converts the data converted into the recording format from the digital signal processor 160 into a bitstream and outputs the bitstream to the optical driver 140.

The digital signal processing unit 160 performs signal processing for restoring the binary signal input from the RF signal processing unit 130 to the original data with its own phase synchronized clock in the reproduction mode, Code (ECC) or the like is added to convert it into a recording format.

The servo unit 190 drives the optical pickup 120 in the horizontal or vertical direction through the driving unit 200 using the tracking error signal and the focus error signal received from the RF signal processor 130 120 to generate the driving voltage of the sled motor 220 for moving the optical pickup 120 to the target track and also controls the spindle motor control for controlling the rotation speed of the optical disc 110 Signal.

The driving unit 200 generates a driving current for driving the spindle motor 210 and the sled motor 220 according to a control signal generated by the servo unit 190, Thereby generating an actuator driving current of the optical pickup 120 for controlling the tracking.

The control unit 180 collectively controls the optical disc drive. In detail, the controller 180 determines whether the RF signal is detected through the RF signal processor 130. An example where there is no RF signal is that the optical disk 110 is a blank disk. If there is no RF signal, the control unit 18 adjusts the gain for detecting the RF signal and adjusts the information area of the optical disc 110 in a state where the gain is adjusted. And the data is recorded while changing the write focus balance value.

After data recording, the control unit 180 reads RF signals through the RF signal processing unit 130 while searching the recorded area and changing the write focus balance value to the retrieved area. Then, among the read RF signals, a point at which a level reaches a maximum (MAX) is searched and a searched point is set as a reference point.

Then, a write focus balance adjustment process is performed around the set reference point. At this time, the control unit 180 can adjust the write focus balance value around the set reference point and select a point at which the error rate becomes minimum as the recording point. Then, the control unit 180 records the data at the recording point at which the write focus balance is adjusted.

According to the above description, even when there is no RF signal, optimum recording quality can be ensured. Also, prior to the light focus balance adjustment, the maximum point of the RF signal level is found, the point is set as the reference point, and the light focus balance adjustment is performed centering on the set reference point, so that the signal and recording quality can be optimized at the same time.

Meanwhile, according to one embodiment, when an RF signal is detected according to the determination result of RF signal detection, the controller 180 adjusts the write focus balance while reproducing data, sets the adjusted point as a reference point, Adjust the light focus balance to the center.

The memory 170 stores positional information on the reference point set by the control unit 180. [ At this time, the controller 180 can determine the position of the reference point using the position information of the reference point stored in the memory 170, and adjust the write focus balance around the detected reference point.

FIG. 2 is a reference diagram illustrating a write focus balance adjustment process of an optical disk drive according to an embodiment of the present invention. Referring to FIG.

Referring to FIG. 2, when there is no RF signal, data is recorded while changing the write focus balance value to a predetermined area of the optical disk 110. At this time, the objective lens included in the optical pickup 120 performs a focusing operation in which the objective lens moves in the vertical direction according to the driving voltage output from the driving unit 200 (FIG. 1).

FIG. 3 is a graph showing a point where the RF signal level is maximized according to the write focus balance adjustment of the optical disc drive according to the embodiment of the present invention.

Referring to FIG. 3, the optical disc drive detects RF signals while changing the write focus balance value for the searched area, and searches for a point at which the level becomes the highest among the detected RF signals. In FIG. 3, The point where the balance value is 0 becomes the point where the RF signal level becomes the maximum. However, the example of FIG. 3 is only one embodiment, and the point at which the RF signal level becomes the maximum may be different depending on the state of the optical disc drive.

4 is a flowchart illustrating a recording control method of an optical disc drive according to an embodiment of the present invention.

Referring to FIGS. 1 and 4, the optical disk drive detects an RF signal (400). At this time, according to the determination result of the RF signal detection, if there is no RF signal (410), a gain for detecting an RF signal is adjusted (420), and the information area of the optical disc The data is recorded while changing the write focus balance value (430).

After the data recording, the RF signals are read while searching the recorded area and changing the write focus balance value to the retrieved area, searching for the point where the level becomes maximum (MAX) among the read RF signals, The point is set as a reference point (440).

Then, a write focus balance adjustment process is performed around the set reference point (450). At this time, the point where the error rate becomes minimum can be selected as the recording point while adjusting the write focus balance value around the set reference point. Subsequently, data is recorded at the recording point at which the write focus balance is adjusted (460).

On the other hand, if an RF signal is detected according to the RF signal detection result, the write focus balance adjustment process is performed (450). For example, while reproducing data, the write focus balance is adjusted and the adjusted point is set as the reference point. The set reference point is used as a reference for adjusting the light focus balance later.

The embodiments of the present invention have been described above. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the disclosed embodiments should be considered in an illustrative rather than a restrictive sense. The scope of the present invention is defined by the appended claims rather than by the foregoing description, and all differences within the scope of equivalents thereof should be construed as being included in the present invention.

110: optical disc 120: optical pickup
130: RF signal processor 140:
150: encoder 160: digital signal processor
170: memory 180:
190: Servo unit 200:
210: spindle motor 220: sled motor

Claims (12)

Detecting an RF signal;
Recording data in a disc area while changing a write focus balance value if there is no detected RF signal;
Searching the recorded area after recording to detect RF signals while changing the write focus balance value, and searching for a point at which the level becomes the highest among the detected RF signals; And
Setting a searched point as a reference point and adjusting a write focus balance around the set reference point;
Wherein the recording control method comprises the steps of: The method according to claim 1,
Adjusting the gain for detecting the RF signal before the step of recording the data if no RF signal is detected;
Further comprising the steps of: determining whether the optical disc drive is in the recording mode; The method of claim 1, wherein the step of writing data to the disk area while changing the write focus balance value comprises:
Wherein data is recorded while moving the objective lens included in the optical pickup in the vertical direction in accordance with the drive voltage. 2. The method according to claim 1, wherein the step of adjusting the write focus balance comprises:
Wherein a point at which an error rate is minimized is selected as an optimum recording point while adjusting a write focus balance value around a reference point. The recording control method according to claim 1,
If the detected RF signal is present, adjusting the write focus balance while reproducing the data; And
Setting the adjusted point as a reference point and adjusting a write focus balance around a reference point that is set later;
Further comprising the steps of: determining whether the optical disc drive is in the recording mode; 2. The recording control method for an optical disc drive according to claim 1,
Recording data with the write focus balance adjusted;
Further comprising the steps of: determining whether the optical disc drive is in the recording mode; An RF signal processor for detecting and processing an RF signal; And
If there is no RF signal detected through the RF signal processing unit, data is recorded while changing the write focus balance value to the area of the disc, the recorded area is searched for, and the write focus balance value is changed to the retrieved area A control unit for detecting RF signals through a signal processing unit, setting a point at which a level is maximum among the detected RF signals as a reference point, and adjusting a light focus balance around a set reference point;
And an optical disc drive. 8. The apparatus of claim 7,
And adjusts the gain for detecting the RF signal before the step of recording the data if no RF signal is detected. 8. The apparatus of claim 7,
Wherein a point at which an error rate becomes minimum while a write focus balance value is adjusted around a reference point is selected as a recording point. 8. The apparatus of claim 7,
And when the detected RF signal is present, adjusts the write focus balance while reproducing the data, sets the adjusted point as the reference point, and adjusts the write focus balance around the later set reference point. 8. The apparatus of claim 7,
And the data is recorded while the write focus balance is adjusted. 8. The optical disk drive of claim 7,
A memory for storing position information on a reference point set by the control unit; Further comprising:
Wherein the control unit grasps the position of the reference point by using the position information of the reference point stored in the memory, and adjusts the write focus balance around the grasped reference point.
KR1020130091099A 2013-07-31 2013-07-31 Optical disk drive and method for controlling data writing of the optical disk drive KR20150015649A (en)

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KR1020130091099A KR20150015649A (en) 2013-07-31 2013-07-31 Optical disk drive and method for controlling data writing of the optical disk drive

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