KR20080102525A - Method and apparatus for controlling recording in optical disc apparatus - Google Patents

Abstract

An overwriting method and apparatus of an optical disc device are provided to improve the recording quality of an overwritable recording medium by applying a different parametric value of recording method according to recording frequency. An overwriting control device of an optical disc apparatus includes a memory unit storing a parametric value of recording method according to recording frequency; an optical pick-up unit(120) reading out the recording frequency information stored in a disc(110); and a control unit confirming the recording frequency information, applying the parametric value of the corresponding recording method according to recording frequency stored in the memory unit, and controlling the data recording in the disc through the optical pickup unit. An overwriting control method of an optical disc device includes a first step for reading out the number of over-writing time from a disc, a second step for confirming whether the over-writing number is the set specific count value, a third step for reading out a parametric value of the recording method corresponding to the specific frequency stored in the memory when the two values coincide with each other, a fourth step for applying the parametric value of the specific recording method and controlling the recording operation, and a fifth step for updating the over-writing number of the disc after the recording operation.

Description

Method and apparatus for repeating recording of an optical disc apparatus {Method and apparatus for controlling recording in optical disc apparatus}

1 is a control block diagram for repeat recording control of an optical disk apparatus according to the present invention;

2 is an operation flowchart for iterative recording control of the optical disk apparatus according to the present invention.

Explanation of symbols on the main parts of the drawings

110: optical disk 111: spindle motor

120: optical pickup 140: channel bit encoder

141: optical drive 150: R / F section

160 drive unit 161 servo unit

170: microcomputer 171: EEPROM

130a: digital recording signal processor 130b: digital reproduction signal processor

185: AGC

The present invention relates to a repetitive recording control method of an optical disc apparatus capable of improving data repeat proxy recording quality on a recording medium in an optical disc apparatus.

Recording media such as CDs and DVDs are classified into read-only ROM, write-once type, and rewritable rewritable type according to their functions and uses.

Such an optical disc apparatus for recording / reproducing an optical disc of a CD or DVD series, records information on the optical disc by changing a physical energy of the information recording layer by irradiating a light beam of relatively large energy that can change the physical characteristics of the information recording layer. It is constructed so that information can be reproduced from the optical disc using a light beam of small energy that is not allowed. In particular, during recording, information is recorded by driving the laser diode LD at a relatively high power to form pits (3T to 14T; T is the length of one clock pulse) on the optical disc. As described above, forming a pit by a predetermined length on the disk is called a write strategy.

When recording information on the recordable optical disc, the optical disc apparatus performs an Optimal Power Control (OPC) process to select a recording power suitable for the disc. To this end, the recordable optical disc includes a PCA (Power Calibration Area), which is a test area for recording power determination, in an unused area of the innermost portion.

In other words, conventionally, ATIP (Absolute Time In Pregroove) information including various information required for recording (i.e., information based on a recording technique) recorded on the disc is read, and recording power is focused on the reference power recommended by the disc manufacturer. Record the test signal in the PCA area by dividing into 15 steps. And reproducing the recorded test signal, and determining the most suitable recording power when the peak hold and the bottom hold of the reproduction signal are properly balanced, and then determining the determined recording power when recording data. Data was recorded in the recordable user area as a value.

However, in the conventional optical disk apparatus, the recording medium can be written once, or the recording medium can be repeatedly recorded, and the parameter value according to the recording technique used is set to one. Therefore, the same parameter value is applied to the recording medium for repetitive recording when recording once, twice or three times.

On the other hand, due to the characteristics of the object constituting the recording medium in the recording medium for repeated recording, the jitter and error rate of the RF signal is remarkably high during the second recording. However, ignoring this phenomenon, conventionally apply the same recording parameter values regardless of the number of recording times of the repeating recording medium, so the recording quality is remarkably dropped in two recordings. There was a case of failure.

Accordingly, an object of the present invention is to provide an optical disk apparatus capable of improving the recording quality of a repeatable recording medium by separately providing parameter values of a recording technique for each recording difference, and applying different parameter values of the recording technique for each recording interval. A repeat recording control method and apparatus are provided.

Another object of the present invention is to provide a repetitive recording control method and apparatus for an optical disk apparatus having a parameter value of a recording technique for the second recording and obtaining an optimum recording quality even in the second recording.

According to an aspect of the present invention, there is provided a repetitive recording control method of an optical disc apparatus, comprising: a first step of reading repetitive recording number information from a disc; A second step of checking whether the read repetition number information is a predetermined number of times; A third step of reading a parameter value of a recording scheme corresponding to a specific number of times stored in a memory when the two values coincide; A fourth step of controlling a recording operation by applying parameter values of a specific recording technique read in the third step; And a fifth step of updating the number of repeated recordings of the disc after the recording operation.

In the present invention, the specific number of times set in the second step is characterized by being the second round.

The fourth step of the present invention is characterized by performing an optimal recording power detection operation by applying parameter values of the second recording technique, and controlling the recording operation with the detected optimal recording power.

In addition, an iterative recording control apparatus of an optical disk apparatus according to the present invention for achieving the above object comprises: memory means for storing a parameter value of a recording technique for each recording frequency; Optical pickup means for reading recording frequency information stored in the disk; And control means for checking the recording frequency information and controlling data recording on the disc through the optical pickup means by applying parameter values of the recording technique for each recording frequency stored in the memory means. do.

The memory means of the present invention stores the parameter value of the second recording technique, and the control means controls the data recording by applying the parameter value of the second recording technique when the data recording is the second time on the disc. It features.

The control means of the present invention is characterized by updating the recording frequency information stored on the disk after recording the data on the disk through the optical pickup means.

The control means of the present invention is characterized by updating the recording frequency information for each division unit with respect to the division unit of the data area of the disc.

Hereinafter, a repetitive recording control method and apparatus of an optical disk apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

Fig. 1 shows a control block diagram for controlling repetitive recording of an optical disc in the optical disc apparatus according to the present invention.

As shown in the drawing, the optical disk apparatus of the present invention includes a digital recording signal processing unit 130a for adding an error correction code (ECC) or the like to input digital data to convert it into a recording format, and converting the data converted into the recording format. And a channel bit encoder 140 for reconverting to a bit stream, and an optical driver 141 for outputting a light amount driving signal according to the input signal.

In addition, the optical disk apparatus of the present invention includes an optical pickup 120 for recording a signal on the optical disk 110 in accordance with the light amount driving signal, and for detecting a recording signal from the recording surface, and a signal detected by the optical pickup 120. An R / F unit 150 for outputting a binary signal by shaping a filter, an AGC 185 for adjusting a gain of a detection signal of the RF unit 150, the optical pickup 150, and a spindle motor 111; Controlling the driving of the drive unit 160 from the drive unit 160 driving the optical drive unit 120, the tracking error signal TE and the focusing error signal FE of the optical pickup 120, and the rotational speed of the optical disc 110. The servo unit 161 is included.

The optical pickup 120 may include a laser diode for generating a laser based on a light amount driving signal output from the optical driver 141, and a photo for receiving a signal from which the laser generated by the laser diode is reflected from the disk 110. Front monitor diode and other light to receive a light emitted from the diode, the laser diode as it generates an output signal (Front Moniter Diode Output; FMD) for checking the amount of light emitted (light intensity) of the laser diode (110) Although a configuration such as an objective lens such as guiding) is included, the configuration of the optical pickup 120 is the same as a general configuration, and thus detailed description thereof will be omitted.

The optical disk apparatus of the present invention includes a digital reproduction signal processor (130b) for restoring the binary signal to original data with its own clock synchronized with the binary signal, and for each recording speed for each disk code (disc manufacturer). Optical power setting values of laser diodes corresponding to four channels of non-multi-pluse write power, multi-pluse write power, read power, erase power, and the like. It includes a memory 171 in which parameter values according to a write strategy including timing values required for operation control are stored in the form of firmware.

In addition, the memory 171 stores a disc which can be repeatedly recorded by setting different parameter values according to a recording technique for each disc code and for each recording time. The parameter value according to the recording technique for each recording frequency at this time is a value predetermined by the experimental value. Hereinafter, in the description of the present invention, the parameter values according to the recording technique stored in the memory 171 will be described by applying only the values divided by the recording times.

In addition, the present invention includes a microcomputer 170 for controlling a recording operation of data on a disk by applying a parameter value according to a recording technique for each recording difference stored in the memory 171. At this time, the microcomputer 170 also performs a control operation to check the recording frequency of the mounted disk 110. In particular, in the case of the second recording, the microcomputer 170 controls the second recording by applying a recording technique parameter value for the second recording.

Therefore, the optical disk apparatus of the present invention checks the recording frequency of the mounted disk and controls the recording of data on the disk by applying different parameter values according to the recording technique for each recording frequency. For this purpose, the parameter values of the recording scheme set differently for each disk code and the number of recording are stored in a nonvolatile memory such as an EEPROM.

The parameter values of the recording techniques for each recording frequency stored in the memory can be detected by various methods. For example, the parameter value of the optimal recording technique for each recording frequency is determined using a jitter meter. It will be possible. That is, the recording waveforms corresponding to 3T to 14T are sequentially generated in the test area of the recording medium by changing the recording technique parameters, recorded on the disk, and the RF waveforms are checked by the jitter to determine the minimum parameter. Can be found and set to optimal parameter values. The parameter value of this recording technique is stored in the EEPROM as the optimal value obtained through various experiments before shipping the drive.

The optical disk device of the present invention having the above-described configuration stores a parameter value of a recording technique differently set for each recording frequency in a memory, writes data to a disk, and writes differently for each recording frequency stored in the memory. The recording of data is controlled by applying parameter values. The operation is performed as follows.

FIG. 2 is a flowchart showing the operation of controlling the repetitive recording operation so that the optical disc apparatus according to the present invention can obtain the optimum recording quality even for the repetition of the disc.

When the microcomputer 170 confirms the recording operation request, the repetition recording frequency N is read from the control information recorded on the disc 110 to be loaded. To this end, the microcomputer 170 drives the spindle motor 111 through the servo unit 161 and the drive unit 160 to rotate the optical disc 110. Then, the optical pickup 120 is moved to the control information recording area on the optical disc 110, and the control information corresponding to the repetitive recording frequency is read (S10). The control information recording area is an area which is set in advance as a predetermined area of the area where general control information is stored in the optical disc.

The microcomputer 170 checks whether the number of repetitive writes N read in the step S10 is one, and then corresponds to the second round when data is recorded (S11).

When the value checked in step S11 is the second time, the microcomputer 170 reads the parameter value of the recording technique corresponding to the two recording times stored in the memory 171. Then, the parameter values of the read-out recording scheme are provided to the servo unit 161, the optical driver 141, and the like to control the setting of the corresponding values (S12).

After the parameter values of the recording technique for the 2nd recording are applied to each part, the test data is divided into 15 stages based on the reference power set at the 2nd recording, and the test data is applied to the test area of the PCA. By recording and reproducing, an OPC (Optimum Power Control) operation for detecting an optimum recording power is performed (S13).

Thereafter, using the optimum recording power obtained from the OPC operation performed in step S13, the microcomputer 170 controls data recording of the corresponding area of the disk (S14, S15).

When the recording of the data is completed, the microcomputer 170 increases the recording frequency N once and records the increased recording frequency N value in the control information recording area of the disc (S17).

On the other hand, if the value checked in step S11 is not the second time, the recording control information used when the data is subsequently written to the disk is applied by applying a default value (parameter value of the basic recording technique) (S18). .

The method and apparatus for repeating recording control of an optical disk apparatus according to the present invention described above are a phenomenon in which the recording quality of the second recording is deteriorated due to the characteristics of an object constituting the recording medium in a rewritable recording medium. In order to prevent the problem, it is characterized by having a parameter value of a different recording technique for each recording time difference. Parameter values of the recording schemes different for each recording frequency are stored in the nonvolatile memory. In another aspect, the present invention is characterized by storing the information according to the recording frequency difference on the disk. Therefore, the present invention is characterized in that the data is read from the disc according to the recording frequency at the time of data recording, and the parameter data of the corresponding recording method stored in the memory is applied to control the data recording of the corresponding frequency on the disk. It is done. According to this aspect, the present invention ensures a disc having a good recording quality regardless of the recording frequency in a disc capable of repeating recording.

In the above embodiment, in order to prevent the recording quality from being significantly reduced in the second round due to the characteristics of the object constituting the RW recording medium, an example of separately applying a recording technique parameter value in the second round is described. However, the present invention is not limited thereto, and for example, the recording technique may be stored according to the repetitive recording characteristics of the rewritable recording medium, and the optimal recording technique parameter values may be applied to each recording interval. It is also possible. In this case, it is necessary to determine the parameter value of the recording technique for each recording difference in advance by the experimental value and store it in the memory. Then, the number of repetitive recordings is checked from the disk, and the parameter values of the recording technique corresponding to the number of recordings to be recorded are read from the memory and applied, and the data recording is controlled.

In addition, in the present invention, the microcomputer 170 may check the recording position information in which the current data is recorded, and control the recording data on the disc by differentiating the recording frequency information for each recording position. In this case, it is preferable that the data area of the disc is divided into physical units (sectors) or units (titles) according to the data information, and control to store recording count information for each division unit.

The above-described preferred embodiment of the present invention has been disclosed for the purpose of illustration, and stores the parameter values of different recording techniques for each recording frequency in advance in memory, and sets the recording techniques differently for each recording frequency of a mounted disc. It can be applied when controlling the repetitive recording of a disc by applying parameter values. Therefore, those skilled in the art will be able to improve, change, substitute or add other embodiments within the technical spirit and scope of the present invention disclosed in the appended claims.

The method and apparatus for repeat recording control of an optical disk apparatus according to the present invention described above, in the RW recording medium capable of repeating recording, have a phenomenon in which the recording quality of the second recording is deteriorated due to the characteristics of the object constituting the recording medium. In order to prevent this, it is characterized by having a parameter value of a different recording technique for each recording time difference. Then, the information is stored in the disk according to the recording frequency, and when the data is recorded, the information according to the recording frequency is read and the recording is performed by applying parameter values of the recording technique of the corresponding frequency. With this control, the present invention obtains a disc having a good recording quality irrespective of the recording frequency difference, and furthermore, the effect of ensuring the reproduction quality is obtained.

Claims (7)

Memory means for storing a parameter value of a recording technique for each recording frequency; Optical pickup means for reading recording frequency information stored in the disk; And And a control means for checking the recording frequency information and controlling the data recording on the disc through the optical pickup means by applying parameter values of the recording technique for each recording frequency stored in the memory means. Repeat recording control device of optical disk device. The method of claim 1, The memory means for storing parameter values of the second write technique, And the control means controls data recording by applying parameter values of the second recording technique when the data recording is to be recorded twice on the disc. The method according to claim 1 or 2, And the control means updates the recording frequency information stored in the disk after recording the data on the disk through the optical pickup means. The method of claim 3, wherein And the control means updates the recording frequency information for each division unit for each division unit of the data area of the disc. A first step of reading the repetition recording number information from the disc; A second step of checking whether the read repetition number information is a predetermined number of times; A third step of reading a parameter value of a recording scheme corresponding to a specific number of times stored in a memory when the two values coincide; A fourth step of controlling a recording operation by applying parameter values of a specific recording technique read in the third step; And And a fifth step of updating the number of repetitive recording times of the disc after the recording operation. The method of claim 5, wherein The specific number of times set in said second step is twice. The method of claim 6, In the fourth step, an optimal recording power detection operation is performed by applying parameter values of the second recording technique, and the recording operation is controlled by the detected optimal recording power.

Images