KR100716936B1 - Optical disc apparatus and method for compensating tilt and playing disc thereof - Google Patents

Abstract

The present invention relates to an optical disc apparatus, a tilt compensation method thereof, and a reproducing method thereof. More particularly, the present invention relates to a decrease in signal quality due to a tilt error when reading data of a lead-in area of an additionally recorded optical disc. The present invention relates to an optical disk apparatus, a tilt compensation method thereof, and a reproduction method thereof, which can prevent the disk and increase the recognition performance thereof. In order to improve the reliability of reading the lead-in area, the optical disk apparatus of the present invention is an optical disk apparatus for recording / reproducing an optical disk, and outputs an RF signal corresponding to the amount of light reflected by irradiating a laser onto the surface of the optical disk A tilt compensator for determining the tilt degree of the optical disc using the signal of the optical pickup unit, a tilt compensator for adjusting the optical pickup unit to compensate for the determined tilt amount, and determining whether additional recording of the optical disc is performed. And a controller for moving to an additionally recorded lead-in area, controlling the tilt compensator to compensate for the tilt amount, and controlling the optical pickup to read data in the lead-in area.

Description

Optical disc apparatus and its tilt compensation method and reproducing method {Optical disc apparatus and Method for compensating tilt and playing disc}

1 is a flowchart of a tilt compensation method of a conventional additionally recorded optical disc.

2 is a block diagram schematically showing a general optical disk device.

3 is a schematic diagram showing the operation of the tilt compensation method of an additionally recorded optical disc according to the present invention;

4 is a flowchart illustrating a tilt compensation method according to the present invention.

* Description of symbols on the main parts of the drawings *

20: optical pickup unit 32: sled motor

36: servo unit 50: RF signal processing unit

40: control unit 52: tilt amount compensation unit

The present invention relates to an optical disc apparatus, a tilt compensation method thereof, and a reproducing method thereof. More particularly, the present invention relates to a decrease in signal quality due to a tilt error when reading data of a lead-in area of an additionally recorded optical disc. The present invention relates to an optical disk apparatus, a tilt compensation method thereof, and a reproduction method thereof, which can prevent the disk and increase the recognition performance thereof.

In general, an optical device is a device for reproducing and recording an optical disk, and a CD (Compact Disc) or DVD (for recording a large amount of information economically and storing information on an optical disk using a laser). Optical disc devices using optical discs such as Digital Versatile Disc) and Blu-ray Disc have been widely used.

An optical disc is divided into a system use area, a power calibration area, and an information area. The information area consists of a lead-in area, a program area, and a lead-out area. The lead-in area includes basic information and recorded data for recording / reproducing a disc. It contains information about the start address and end address of.

The optical disc apparatus is provided with an optical pick-up unit that shoots a laser on the optical disc for recording / reproducing, receives a reflected laser, and outputs a signal corresponding thereto. However, optical discs are produced by various manufacturers through various manufacturing processes, and the surface of the optical disc is not uniform, such as deformation of the disc due to external environment. The tilt of the optical disc is inevitably generated. When the disc is inserted, the tilt is measured to compensate for this by controlling the optical pickup unit during recording / playback.

1 is a flowchart of a tilt compensation method of a conventional additionally recorded disc. When the disc is inserted, it detects the type of the inserted disc and reads the data of the lead-in area at the innermost circumference of the disc. (Steps S110 and S120) Whether the disc is additionally recorded using the data read from the lead-in area. Check That is, it is determined whether there is another lead-in area (step S130). In the case of an additionally recorded disc, the data of the next lead-in area is read sequentially and the start and end addresses of the data recorded on the disc are checked, and the corresponding disc is read. Understand basic information of. This information is referred to by the control unit or the like when recording or playing back the disc. (Step S140) An algorithm for determining the tilt degree of the disc for accurate playback and adjusting the optical pickup unit to compensate for the tilt accordingly. (Step S150).

In the conventional tilt compensation method, the tilt amount is generally increased toward the outer circumference of the disk and data is recorded from the inner circumference to the outer circumference, so that additional data is located on the outer circumference of the disk. Therefore, in the related art, tilt compensation is performed after reading all the additionally recorded lead-in area data, and the data of the lead-in area on the outer periphery of the disc is degraded by the tilt of the disc, resulting in poor reading reliability and recognition of the disc. There is a problem that can not be.

In addition, there is a problem that it takes a long time to recognize the disk by repeating the attempt to read the data of the lead-in area.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to prevent signal degradation when reading data in a lead-in area of an additionally recorded disc, thereby ensuring reliability of data reading in the lead-in area and improving the disc. An optical disk device and a tilt compensation method thereof which can reduce recognition time are provided.

An optical disk apparatus of the present invention for achieving the above object is an optical disk apparatus for recording / reproducing an optical disk, the optical pickup unit for outputting an RF (RF) signal corresponding to the amount of light reflected by irradiating a laser on the surface of the optical disk And a tilt compensator for determining the tilt degree of the optical disc using the signal of the optical pickup unit and adjusting the optical pickup unit to compensate for the determined tilt amount, and determining whether additional recording of the optical disc is performed and additional recording. And a controller for moving to the recorded lead-in area, controlling the tilt compensator to compensate for the tilt amount, and controlling the optical pickup to read data in the lead-in area.

The tilt compensator may be further configured to determine the tilt amount of the optical disc by using the jitter value of the RF signal or the envelope size of the RF signal.

The tilt compensation may be performed by adjusting the optical pickup unit so that the jitter value of the RF signal is reduced or the envelope size of the RF signal is increased.

The tilt compensation method of the optical disk device of the present invention for achieving the above object is a tilt compensation method of an optical disk device including an optical pickup unit for irradiating a laser to the optical disk, if the optical disk is inserted, the optical disk is additionally recorded Checking; Moving to an additionally recorded lead-in area when the optical disc is an additionally recorded optical disc; Determining the tilt amount of the optical disc and compensating the determined tilt amount by adjusting the optical pickup; Reading data of the additionally recorded lead-in area.

The tilt amount may be determined using the jitter amount of the RF signal output from the optical pickup unit or the envelope size of the RF signal.

The method may further include determining whether there is an additionally recorded portion of the optical disc, and repeating the tilt compensation until reading data of the lead-in area of the last additionally recorded portion. .

In the method of reproducing the optical disk device of the present invention for achieving the above object, in the method of reproducing the optical disk device for recording / reproducing the optical disk, the additionally recorded lead-in when the optical disk is additionally recorded by determining whether the optical disk is additionally recorded. The data of the additionally recorded lead-in area may be read after compensating the amount of tilt of the lead-in area before reading the data of the area.

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

2 is a block diagram schematically illustrating a general optical disk device. A general optical disk device includes an optical pickup unit 20 including an objective lens 22, a beam splitter 28, a laser diode (LD) 26, a photo diode (PD) 24, an RF signal processing unit 50, It comprises a DSP (Digital Signal Processor) 60, tilt compensation unit 52, control unit 40, servo unit 36, drive unit 34 and sled motor 32, spindle motor 30 .

The optical pickup unit 20 reproduces / records data by irradiating a laser onto the optical disc 10.

To this end, the optical pickup unit 20 receives the lasers reflected from the optical lens 10 and the objective lens 22 which focuses the LD 26 and the laser emitted from the LD 26 on the surface of the optical disc 10. And a PD 24 for outputting a corresponding signal.

The beam splitter 28 irradiates the optical disk 10 with the laser emitted from the LD 26 and adjusts the laser so that the reflected laser is received by the PD 24.

The RF signal output from the PD 24 of the optical pickup unit 20 is transferred to the RF signal processing unit, converted into a digital signal through an equalizing process and a slicing process, and transmitted to the DSP 60.

The DSP 60 processes the digital signal transmitted from the RF signal processor 50 according to a specification and outputs the digital signal to the display device.

Tilt compensator 52 Compensates the amount of tilt by adjusting the optical pickup unit 20 using the jitter value representing the quality of the reproduction signal or the size of the envelope of the RF signal using the digital signal of the RF signal processor 50. . That is, when the jitter value of the RF signal or the size of the envelope is transmitted to the control unit 40, the control unit 40 controls the servo unit 36 to drive the sled motor 32 and the like and the optical pickup unit 20 and the optical disc. To make it vertical.

The tilt compensation detects and stores the reproduction quality (jitter value or the size of the envelope of the RF signal) of the RF signal detected while swinging the optical pickup unit 20 step by step, and the reproduction quality is the best, i. The angle of the optical pickup unit 20 when the size of the envelope of the RF signal is the largest is stored. This operation is performed by moving the optical pickup unit 20 from the inner circumference to the outer circumference of the optical disc to calculate a curve of the tilt amount and to compensate the tilt by using the calculated curve.

The servo unit 36 controls the driving unit 34 by using a tracking error and a focusing error detected from the RF signal to achieve accurate tracking and focusing.

 4 is a flowchart illustrating a tilt compensation method according to the present invention, which will be described below with reference to FIG. 3.

When the disc is inserted, the control unit 40 determines the type and type of the disc according to the stored control program and controls the optical pickup unit 20 to move to the position of the lead-in area of the innermost circumference (step S410). (20) reads the data of the lead-in area of the innermost column to obtain basic information of the disk and checks whether the inserted disk is an additionally recorded disk (steps S420 and S430). Using the data of the lead-in area, a tilt compensation algorithm is performed to check the start address and the last address where the data is recorded and to determine the tilt amount of the disk to compensate for this (step S440).

In the case of the additionally recorded disc, the optical pickup unit is moved to the additionally recorded lead-in area (step S450). The tilt compensation algorithm is performed at the position of the disk to which the optical pickup unit has moved (step S460). If the data is larger and larger than the periphery, and the data in the lead-in area cannot be read by the tilt, the disc recognition fails and the disc recognition time is lengthened by repeating the retry. Since the present invention compensates for the tilt before reading the data of the lead-in area, there is no fear that the reading will fail. After the tilt compensation algorithm is performed, the data of the additionally recorded lead-in area is read accordingly. (S470) The above steps S450 to S470 are repeated until the data of the additionally recorded lead-in area is finally read. S480 step)

As described above in detail, the present invention has an effect of improving the reliability of reading by performing tilt compensation before reading the data of the additionally recorded lead-in area.

In addition, it is possible to shorten the time required for disc recognition by preventing repeated reading attempts of the lead-in area in order to recognize the disc.

Claims (7)

An optical disc apparatus for recording / reproducing an optical disc, An optical pickup unit for outputting an RF signal corresponding to the amount of light reflected by irradiating a laser onto a surface of the optical disk; A tilt compensator configured to determine a tilt degree of the optical disc using the signal of the optical pickup unit, and adjust the optical pickup unit to compensate the determined tilt amount; It is determined whether the optical disc is additionally recorded, and if the data is additionally recorded, it moves to the additionally recorded lead-in area, the tilt compensator is controlled to compensate the tilt amount, and the optical pickup is controlled to read the data of the lead-in area. An optical disc device including a control unit. The method of claim 1, And the tilt compensator determines the tilt amount of the optical disc using the jitter value of the RF signal of the optical pickup unit or the envelope size of the RF signal. The method of claim 2, The tilt amount is compensated by adjusting the optical pickup to reduce the jitter of the RF signal or to increase the envelope size of the RF signal. In the tilt compensation method of an optical disk device including an optical pickup unit for irradiating a laser to the optical disk, Checking whether the optical disk is an additionally recorded optical disk when the optical disk is inserted; Moving to an additionally recorded lead-in area when the optical disc is an additionally recorded optical disc; Determining the tilt amount of the optical disc and compensating the determined tilt amount by adjusting the optical pickup; And reading the data of the additionally recorded lead-in area. The method of claim 4, wherein And the tilt amount is determined using the jitter amount of the RF signal output from the optical pickup unit or the envelope size of the RF signal. The method of claim 4, wherein Determining whether there is more additionally recorded portion of the optical disc, and repeating the tilt compensation until reading data of the lead-in area of the last additionally recorded portion of the optical disc apparatus. Tilt Compensation Method. A reproduction method of an optical disc apparatus for recording / reproducing an optical disc, In the case of an additionally recorded optical disc by determining whether the optical disc is additionally recorded, the data of the additionally recorded lead-in area is compensated after compensating the tilt amount of the corresponding lead-in area before reading the data of the additionally recorded lead-in area. A reproduction method of an optical disc device, characterized in that for reading.

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