KR100624274B1 - Method for controlling optical disc recorder/reader - Google Patents

Abstract

The present invention relates to a control method of an optical disc recording / reproducing apparatus, comprising: recognizing a type of disc when an arbitrary disc is loaded into the optical disc recording / reproducing apparatus; and a constant angular velocity (CAV) if the disc is not a recordable disc. ) Spinning the spindle motor under control, rotating the spindle motor under CLV (Constant Linear Velocity) control if the disc is a recordable disc, and recording management area (RMA) information of the disc after performing CAV and CLV control. Searching for the final recording position with reference to, and reproducing or recording the disc at the corresponding position when the final recording position of the disc is detected. According to the present invention, when new information is additionally recorded from the last recording position for the disc being recorded, reliability is solved by solving various problems that may occur during post-recording reproduction and additional recording that may occur in the optical disc recording / reproducing apparatus. It is possible to secure the playback performance, which has the effect of increasing the consumer satisfaction.

Description

Control method of optical disc recording / playback device {METHOD FOR CONTROLLING OPTICAL DISC RECORDER / READER}

1 is a block diagram illustrating an optical disk recording / reproducing apparatus for implementing a control method according to the present invention;

2 is a flowchart of a control process of the optical disc recording / reproducing apparatus according to the preferred embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

1: disc 2: spindle motor

3: optical pickup 4: traverse motor

5 focus driver 6 tracking driver

7: traverse motor drive unit 8: control unit

9 spindle control unit 10 spindle drive unit

11: data slicer 12: PLL circuit

The present invention relates to an optical disc recording / reproducing apparatus, and more particularly, to a control method of an optical disc recording / reproducing apparatus suitable for additional recording or reproduction at a proper position with respect to a recordable optical disc.

The physical formats of CD (Compact Disc) and DVD (Digital Versatile Disc) have already been unified, and the information recording in them has a linear speed of 1.3 m / s for CD and a linear speed of 3.49 m / for DVD. In s, it is performed in the pipits irrespective of audio | video image information or code information.

As such, in the apparatus (CD player, DVD player) for reproducing audio and video information recorded at a constant linear speed on a disc, access performance is not particularly important in the past, and a transmission rate (or linear speed) is secured for the purpose of securing low noise and low vibration. CLV (Constant Linear Velocity) control is performed to control the number of revolutions of the spindle motor so that) is constant over the inner and outer circumferences of the disk.

The control phase-locks the reproduction clock of the phase-locked loop control unit of the signal processing circuit to a frequency-dividing reference clock from a quartz oscillator and divides the reproduction clock frequency into its frequency division. Is achieved by applying a frequency control to the given reference clock to generate a control signal of the spindle motor.

On the other hand, in an apparatus (CD-ROM drive) or a DVD-ROM drive) for reproducing a disc on which code information for a computer is recorded, jitter for controlling the reproduction clock itself of the PLL of the signal processing circuit in order to satisfy the high-speed access performance. Constant Angular Velocity (CAV) control is performed to introduce a jitter-free and control the spindle motor to rotate at the same rotation speed from the inner circumference to the outer circumference of the disc.

In the prior art, as the control method used for information reproduction, both CLV control or CAV control are adopted for both audio and video information and code information. That is, data processing for processing audio and video information for all the information on the disk and using CLV control that has lowered the transmission rate over the front of the disk, or data processing for processing code information for all the information on the disk, i.e., audio And the like are also stored in a cache memory or the like and then transferred to the outside as memory information, and CAV control is used in which the transfer rate increases as the disc goes outward.

On the other hand, since almost all audio and video information is recorded when the CAV control is performed for all the information on the disc, random access hardly occurs. However, if the host has a predetermined transfer rate or more, performance changes in the audio output and video display do not occur. Despite the absence, the spindle motor rotates at a higher speed than necessary, causing vibrations caused by rotational noise and eccentricity to become noise.

On the other hand, when recording a recordable disc, such as a DVD-RW, the disc is left open for the next additional recording and the recording ends, and all information related thereto is stored in the recording management area (RMA) located at the innermost circumference of the disc. Done. When the disc is recognized later, the optical disc recording / reproducing apparatus switches to a state in which an empty area is waiting for further recording for a new recording.

At this time, since the optical disc recording / reproducing apparatus does not know how far this disc is recorded, it should read the RMA information inside the disc. In this process, the RMA is located on the innermost side of the disk, which raises the problem that the spindle speed is sensitive to the playback performance and thus the reliability of the CAV can be reduced.

In other words, the most common problems during playback and recording of DVD-RW discs occur during the RMA reading and recording process. However, if the RMA is read according to the existing CAV control, the reading is incorrect or recording information is lost. Loss occurs. It may even happen that the reads become inaccurate and rewrite causes the disc itself to no longer be usable.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and when reading or replaying a recordable disc at a previous recording completion time, the RMA is read according to the CLV control, thereby ensuring stable playback and recording performance. It is an object of the present invention to provide a control method of an optical disc recording / reproducing apparatus.

According to a preferred embodiment of the present invention for achieving this object, there is provided a method of driving an optical disk recording / reproducing apparatus for reproducing an optical disk or recording information by rotating a spindle motor. Recognizing the type of the disc when the disc is loaded; rotating the spindle motor under CAV control if the disc is not a recordable disc; and rotating the spindle motor under CLV control if the disc is a recordable disc. It provides a control method of an optical disc recording / reproducing apparatus comprising the step of.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

1 is a block diagram of an optical disk recording / reproducing apparatus for implementing a control method according to the present invention, which includes a spindle motor 2, an optical pickup 3, a traverse motor 4, a focus driver 5, The tracking driver 6, the traverse motor driver 7, the controller 8, the spindle controller 9, the spindle driver 10, the data slicer 11, and the PLL circuit 12 are included.

The information recorded on the disc 1 is reproduced by the optical pickup 3. More specifically, the optical pickup 3 focuses the light beam precisely on a mark recorded on a pit or track on the disk 1 by a focusing unit set therein so as to reduce the intensity of the reflected light. To reproduce the signal. The movement of the light beam to the desired track on the disk 1 is realized by the traverse motor 4 moving the optical pickup 3 along the radial direction of the disk 1.

In the case of recording information on the disc 1, the light beam is moved by the traverse motor 4 in the inner circumferential side region portion of the disc 1, and continuous information is recorded on the appropriate track in the empty place.

In order for the light beam to connect the focus on the disk 1 and to accurately scan the pit rows (tracks), the following control by the controller 8 is performed.

The focus error signal and the packeting error signal input by the optical pickup 3 are subjected to low-pass compensation and phase compensation by the control unit 8, and the compensated signal is supplied to the focus driver 5 and the tracking driver 6. It feeds back to the focus actuator and tracking actuator set during the optical pickup 3.

In this way, a focus servo is applied to connect the light beam to the focus on the disk 1, and a tracking servo is applied to accurately scan the pit rows (tracks).

An RF signal is generated by the optical pickup 3, which is binarized by the data slicer 11 and input to the PLL circuit 12. The PLL circuit 12 generates a reproduction clock by the inputted binarized signal to synchronously extract the signal on the disc 1.

The rotation of the disk 1 is controlled by the spindle motor 2. This rotation control is characterized in that it is selectively performed by CAV control or CLV control according to the present invention. That is, if any disc is seated in the optical disc recording / reproducing apparatus, the disc type is recognized. If the disc is recognized as a normal playback disc, CAV control is performed. If the disc is recognized as a recordable disc, for example, a DVD-RW disc, CVL is recognized. Take control.

The control signal necessary for the spindle motor 2 for realizing CAV control or CLV control is generated by the spindle control unit 9.

The spindle control unit 9 generates a control signal of the spindle motor 2 by the FG signal obtained from the rotation detector of the spindle motor 2 in the case of CAV control, and controls the spindle moder 2 from the regeneration clock in the case of CLV control. Generate a signal. These control signals control the rotation of the spindle motor 2 via the spindle drive 10.

Hereinafter, with reference to the flowchart of Figure 2 attached to the control process of the optical disk recording / reproducing apparatus according to a preferred embodiment of the present invention together with the above-described configuration will be described in detail.

First, in step S200, the controller 8 determines whether an arbitrary disc is loaded, and if an arbitrary disc is loaded, the controller 8 proceeds to step S202 to recognize a disc type.

After performing step S202, the controller 8 proceeds to step S204 to determine whether the disc is a recordable disc, such as a DVD-RW disc.

As a result of the determination in step S204, if the loaded disc is not a recordable disc, i.e., a normal playback disc, the controller 8 proceeds to step S206, but if it is a recordable disc, the controller 8 Proceeds to step S212.

In step S206, the controller 8 applies a CAV control command to the spindle controller 9. According to the CAV control command, the spindle control unit 9 drives the spindle drive unit 10 with CAV. As a result, the spindle motor 2 is controlled by CAV so that the disk 1 rotates at a rotational speed under CAV control. .

The control unit 8 then proceeds to step S208 to search for the final recording position of the loaded disc. This final recording position search can be implemented by reading the RMA information existing in the innermost circumference of the disc as described above.

When the search operation based on the RMA information is completed and the final recording position of the disc is detected, the controller 8 proceeds to step S210 to control the optical pickup 3 or the like to play the disc at the corresponding position.

On the other hand, as a result of the determination in step S204, when the loaded disc is a recordable disc, that is, a DVD-RW disc, the control unit 8 proceeds to step S212, and in step S212 the control unit 8 ) Applies a CLV control command to the spindle control unit 9. In response to the CLAV control command, the spindle control unit 9 drives the spindle drive unit 10 to CLV, and as a result, the spindle motor 2 is controlled to CLV at a rotational speed under CLV control, which is relatively slower than CAL control. The disk 1 is rotated.

The control unit 8 then proceeds to step S214 to search for the final recording position of the loaded disc with reference to the above-mentioned RMA information. In this embodiment, when the recordable disc is loaded, the RMA information is read by performing CLV control in which the rotational speed of the spindle motor 2 is relatively low, thereby improving reliability in detecting the final recording position of the disc.

When the search operation based on such RMA information is completed and the final recording position of the disc is detected, the control section 8 proceeds to step S216 and the optical pickup 3 or the like to record (or play) the disc at that position. To control.

As described above, the present invention is implemented to selectively perform CAV control or CLV control depending on the type of the disc loaded in the optical disc recording / reproducing apparatus.

As mentioned above, although this invention was demonstrated concretely based on the Example, this invention is not limited to this Example, Of course, various changes are possible within the scope of the following Claim.

According to the present invention, when new information is additionally recorded from the last recording position for the disc being recorded, reliability is solved by solving various problems that may occur during post-recording reproduction and additional recording that may occur in the optical disc recording / reproducing apparatus. Performance can be ensured, which increases the consumer's satisfaction.

Claims (4)

A method of driving an optical disc recording / reproducing apparatus which rotates a spindle motor to reproduce an optical disc or record information. Recognizing a type of the disc when an arbitrary disc is loaded into the optical disc recording / reproducing apparatus; Rotating the spindle motor under CAV control if the disc is not a recordable disc; Rotating the spindle motor under CLV control if the disc is a recordable disc Control method of an optical disc recording / reproducing apparatus comprising a. The method of claim 1, The method, Searching for the final recording position of the disc after performing the CAV control; If the last recording position of the disc is detected, playing the disc at that position The control method of the optical disk recording / reproducing apparatus further comprising. The method of claim 1, The method, Searching for the final recording position of the disc after performing the CLV control; If the last recording position of the disc is detected, recording the disc at that position The control method of the optical disk recording / reproducing apparatus further comprising. The method of claim 2 or 3, And the final recording position search is implemented by reading the RMA information present in the innermost circumference of the disc.

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