KR20040068697A - Method for generating optimized record power and optical disc record/player - Google Patents

Abstract

The present invention relates to an optimal recording power setting method and an optical disk recording / reproducing apparatus, wherein when an optical disk having a media ID is inserted for the first time, an OPC is performed to find an optimal recording power and then the optimal recording power. The recording power of the recording medium is stored in the memory in the optical disc recording and reproducing apparatus, and then when the same disc is inserted for recording, the test recording is performed on the disc already known by recording the data at the optimum recording power stored in the memory without performing OPC. It is possible to omit the setting of the optimum recording power by means of this, thereby reducing the degradation of the laser diode and responding to the user's recording request more quickly.

Description

Optimal recording power setting method and optical disc recording and reproducing apparatus {Method for generating optimized record power and optical disc record / player}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system for recording and reproducing data on an optical disk having a media ID, and more particularly, to a method for generating an optimal recording control signal for recording data on an optical disk and an optical disk recording and reproducing apparatus.

In general, an optical recording medium, that is, an optical disc recording and reproducing apparatus for recording and reproducing an optical disc, reproduces data recorded on the optical disc using an optical disc such as a CD (Compact disc), a DVD (Digital versatile disc), or the like as a recording medium. And a device for recording data on the disc.

The DVD is not much different from the CD in terms of implementation. That is, the data is recognized on the same principle as the CD for recognizing the data of 0 and 1 by the difference in the amount of light reflected by the laser. The difference is that the data storage is smaller than the CD.

At this time, as the general optical recording and reproducing apparatus progresses to the high density optical recording and reproducing apparatus, the problem of unauthorized copying has been seriously raised. Thus, various methods of copy protection have been proposed to prevent this.

One of them is a method of using a burst cutting area (BCA). In the case of DVD-R / RW, a media ID is recorded in the BCA area.

Fig. 1 shows the structure of a disc in which a media ID exists. A BCA area exists in the innermost circumference of the lead-in area, and a media ID is recorded in the BCA area. The media ID has a stripe form and is recorded in a bar code state in the circumferential direction.

Fig. 2 shows the format of a BCA pack containing a media ID, where the media ID is written in the 5-6th byte position to indicate the manufacturer ID of the manufacturer of the disc and the 7-11th byte position. It is composed of a serial number, which is a unique number recorded on the disk and given to each disk. That is, the manufacturer ID is assigned to each manufacturer, and the serial number is assigned to each disk as a unique number of the disk.

On the other hand, when an optical disc having such a structure is inserted into an optical disc recorder for recording, a process of finding an optimum recording power through test recording in a power calibration area (PCA) on the inner circumference of the disc, that is, the disc An Optimal Power Control (OPC) process is performed to select a recording power suitable for the recording, and data is recorded on the optical disk with the generated optimal recording power.

The PCA is divided into a test area for testing laser power when performing OPC and a count area for recording the number of tests, that is, the number of repeated recordings. For example, if the PCA is divided into 100 partitions each so that OPC can be executed 100 times, the test can be performed up to 100 times, and if more than 100 times, the recording space is not available anymore. .

That is, the optical disc recording / reproducing apparatus reads the ATIP (Absolute Time In Pregroove) information recorded on the disc, divides the recording power into 15 steps based on the reference power recommended by the disc manufacturer, and randomly or nT EFMs in the test area of the PCA. Record the (Eight to Fourteen Modulation) signal. Then, play back this and judge that the proper recording power is assumed when the peak hold and the bottom hold of the reproduced signal are properly balanced, and then record the data in the recordable user data area with this value. do.

However, since the capacity of the PCA area is limited, there may occur a case where recording is not possible anymore because the OPC cannot be performed even though a recording space remains or can be recorded further. In addition, by repeatedly performing the above-described OPC process every time a disc is inserted, the laser diode LD may be deteriorated.

SUMMARY OF THE INVENTION An object of the present invention is to provide an optimal recording power setting method and an optical disk recording and reproducing apparatus that facilitate the optimum recording power setting using media ID information.

1 is a diagram showing the structure of an optical disk in which a media ID is generally present.

FIG. 2 is a diagram illustrating a format of a BCA pack including the media ID of FIG. 1. FIG.

3 is a flowchart for performing an optimal recording power setting method according to the present invention.

4 is a diagram illustrating an example of a memory map for storing a media ID and an optimal recording power in FIG. 3.

5 shows an example of an optical disk recording apparatus for setting an optimum recording power according to the present invention.

Explanation of symbols for main parts of the drawings

501: optical disk 502: optical pickup

503: ALPC feedback unit 504: micom

505: EEPROM 506: optimal recording power output unit

507: encoder 508: LD drive unit

According to an embodiment of the present invention, an optimal recording power setting method includes: (a) reading a media ID from an inserted optical disc when an optical disc having a media ID is inserted for recording;

(b) confirming whether the media ID read in step (a) is stored in a memory in the optical disc recording / reproducing apparatus;

(c) if it is determined that the media ID is stored in the memory, recording data on the optical disc using an optimal recording power stored with the media ID; And

(d) if it is determined that the media ID is not stored in the memory, perform an OPC to generate an optimal recording power, and then store this optimal recording power together with the media ID in the memory, and then use the optimal recording power. And recording data on the optical disk.

The media ID stored in the memory may be a manufacturer ID assigned to each manufacturer and a serial number assigned to each optical disk.

Step (d) stores the temperature information at the time when the optimal recording power generated through the OPC process is stored in the memory. In step (c), if it is determined that the media ID is stored in the memory, Measuring a temperature, reading an optimal recording power and temperature information corresponding to the media ID from the memory, obtaining a difference between the measured temperature and the stored temperature, and the amount of temperature change obtained in the step Compensating for the optimal recording power as much as possible, and then recording the data onto the optical disc.

The step (d) is characterized in that the media ID and the optimal recording power are not stored in the memory if the inserted optical disc is a write once disc.

The step (d) is characterized in that the media ID and the optimum recording power are not stored in the memory when data is recorded in the inserted optical disk when the disk capacity is filled up.

An optical disc recording and reproducing apparatus according to the present invention includes an optical pickup having a temperature sensor attached to the optical disc having a media ID, which is transferred to a corresponding position in the optical disc and reads the media ID when the optical disc having the media ID is inserted for recording. A nonvolatile memory for storing the optimal recording power information of the optical disc corresponding to the media ID, and if the media ID read through the optical pickup is stored in the memory, the optimal storage stored with the media ID Control to output the recording power, and if not stored, performs an OPC to generate the optimum recording power, and if the optimum recording power is generated by the OPC control unit for storing the media ID and the optimum recording power at this time And the optimum recording power stored in the memory under the control of the controller. Or an optimum recording power output unit for outputting data for recording to the optical drive, or for performing an OPC to generate an optimum recording power and outputting the data to the controller and for outputting data to the optical disc. It is done.

The controller also stores the temperature information read from the temperature sensor of the optical pickup when storing the optimal recording power generated through the OPC process in the memory, and if it is determined that the media ID is stored in the memory, from the temperature sensor of the optical pickup And measuring the current temperature, reading the optimal recording power and temperature information corresponding to the media ID from the memory, and calculating the difference between the measured temperature and the stored temperature to compensate for the optimal recording power.

Other objects, features and advantages of the present invention will become apparent from the following detailed description of embodiments taken in conjunction with the accompanying drawings.

Hereinafter, with reference to the accompanying drawings illustrating the configuration and operation of the embodiment of the present invention, the configuration and operation of the present invention shown in the drawings and described by it will be described as at least one embodiment, By the technical spirit of the present invention described above and its core configuration and operation is not limited.

The present invention performs OPC when the optical disc with the media ID is first inserted for recording to find the optimal recording power, and then stores the optimal recording power together with the media ID in the memory in the optical disc recording / reproducing apparatus. Then, when the same disk is inserted for recording, it has a feature of recording data at an optimum recording power stored in the memory without performing OPC.

3 is a flowchart for performing an optimal recording power setting method according to the present invention. When a disc having a media ID is inserted (step 301), the media ID is read from the corresponding area (step 302). Then, the optimum power information area in the memory is searched (step 303) to check whether the media ID read from the inserted disc is stored in the optimum power information area in the memory (step 304).

Here, it is determined that the optimum recording power corresponding to the media ID is stored in the optimum power information area in the memory only when both the manufacturer ID and the serial number of the media ID match.

If it is determined that the media ID read out from the disc is not stored in the optimum power information area in the memory, test recording is performed in the PCA using the above-described OPC method to find the optimum recording power (step 305). The optimal recording power found at this time, the current temperature, and the media ID read from the disc, i.e., the manufacturer ID and serial number, are stored in the memory in the optical disc recording / reproducing apparatus (step 306).

4 shows an example of a map of the memory, which records a manufacturer ID, a serial number, an optimal recording power, and a current temperature.

Here, the storage of the current temperature is because the optimum recording power may vary when the temperature is changed due to the characteristics of the laser diode LD. In other words, when the temperature is different at the same drive current, the amount of light output from the LD is different, so the optimum recording power is also different. Therefore, this is to compensate for the amount of change in temperature when data is recorded at the optimal recording power stored in the memory without performing the OPC.

After the media ID and the optimal recording power are stored in step 306, data is recorded on the inserted optical disc using the optimal recording power (step 307).

On the other hand, if it is determined in step 304 that the corresponding media ID is stored in the optimum power information area in the memory, the current temperature is measured (step 308).

Then, the difference Δ between the temperature stored in the optimum power information area in the memory and the current temperature is obtained (step 309). Subsequently, the LD driving current is compensated by the temperature difference Δ. This is to obtain an optimum recording power equal to the optimal recording power at the time of storage.

Then, data is recorded on the inserted optical disc using the optimal recording power with the temperature difference? Compensated (step 307).

Fig. 5 is a block diagram showing the recording-related part of the optical disc recording / reproducing apparatus according to the present invention, in which the microcomputer 504 controls the media ID and optimal recording power storage. The memory may be a nonvolatile memory, which may use a memory in the microcomputer 504, or may use an EEPROM (Electrically Erasable Read Only Memory) 505 provided outside the microcomputer 504. In the present invention, it is assumed that the media ID and the optimal recording power are stored in the optimal power information area of the EEPROM 505 in the form of a map as shown in FIG.

That is, when a disc having a media ID is inserted for recording, the microcomputer 504 transfers the optical pickup 501 to the area where the media ID is recorded to read the media ID. At this time, the media ID read from the optical disc 501 by the optical pickup 502 is input to the RF signal generation unit 503, and the RF signal corresponding to the media ID is output to the microcomputer 504. Then, the microcomputer 504 checks whether the media ID output from the RF signal output unit 503 is stored in the optimal power information area of the EEPROM 505.

If it is not stored, the optimum recording power output unit 506 finds the optimum recording power by applying the above-described OPC, and then stores the optimum recording power, manufacturer ID, serial number, and current temperature information in the EEPROM 505. In the optimal power information area. However, it is not saved when recording with DAO (Disc At Once) or when the disc is full. Next, when the same disk is inserted, the stored optimum recording power is found using the media ID read from the inserted disk, and the temperature variation is compensated for and output to the LD driver 508. At this time, a temperature sensor is attached inside or outside the optical pickup 502 to measure the temperature.

The LD driver 508 is turned on / off by data output from the encoder 507 to convert the optimal recording power into LD driving current, and then drives the LD of the optical pickup 501 to drive the data on the optical disk 501. Record it.

At this time, the auto laser power control (ALPC) feedback unit 502 receives a part of the recording power when data is recorded on the disk 501 by the optical pickup 502 and receives the microcomputer 504. Will print That is, the light output of the LD changes significantly with temperature, and as the temperature increases, the recording power decreases, and as the temperature decreases, the recording power increases. Feedback to front monitoring PD at 502. The ALPC feedback unit 502 outputs the ± power level to the microcomputer 504 according to the LD power detected by the monitoring PD (MPD), and the microcomputer 504 outputs the power level fed back to the optimum recording power output unit ( In addition to the recording power output from 506, the LD output power is kept constant during recording / reproducing.

As described above, according to the method of setting an optimum recording power and an optical disk recording / reproducing apparatus according to the present invention, when an optical disk having a media ID is first inserted for recording, an OPC is performed to find an optimal recording power and then the media is recorded. The disc is already known by storing the optimal recording power along with the ID in the memory in the optical disc recording and reproducing apparatus, and then recording the data with the optimal recording power stored in the memory without performing OPC when the same disk is inserted for recording. It is possible to omit the setting of the optimum recording power through test recording, which can reduce the degradation of the laser diode and respond more quickly to the user's recording requirements.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the present invention.

Therefore, the technical scope of the present invention should not be limited to the contents described in the embodiments, but should be defined by the claims.

Claims (7)

In the optical disc recording and reproducing apparatus of the optical disc recording and reproducing apparatus, when the optical disc having the media ID is inserted for recording, the optimum power control (OPC) is performed to generate the optimum recording power and then record data on the optical disc. In (a) reading the media ID from the inserted optical disk when the optical disk on which the media ID exists is inserted for recording; (b) confirming whether the media ID read in step (a) is stored in a memory in the optical disc recording / reproducing apparatus; (c) if it is determined that the media ID is stored in the memory, recording data on the optical disc using an optimal recording power stored with the media ID; And (d) if it is determined that the media ID is not stored in the memory, OPC is performed to generate an optimal recording power, and then the optimal recording power is stored in the memory together with the media ID, and then the optimal recording power is used. And recording data on the optical disk. The method of claim 1, The media ID stored in the memory is a manufacturer ID assigned to each manufacturer and a serial number assigned to each optical disk. The method of claim 1, wherein step (d) And storing the temperature information at the time when the optimal recording power generated through the OPC process is stored in the memory. The method of claim 3, wherein step (c) Measuring a current temperature when it is determined that the media ID is stored in the memory; Reading optimal recording power and temperature information corresponding to the media ID from the memory; Obtaining a difference between the measured temperature and the stored temperature; And recording data on the optical disc after compensating for the optimum recording power by the amount of temperature change obtained in the step. The method of claim 1, wherein step (d) And if the inserted optical disc is a disc which can be written once, the media ID and the optimum recording power are not stored in the memory. The method of claim 1, wherein step (d) And the media ID and the optimal recording power are not stored in the memory when data is recorded in the inserted optical disk when the disk capacity is filled up. An optical disc recording and reproducing apparatus for recording data onto an optical disc after performing an optimum power control (OPC) to generate an optimum recording power when an optical disc having a media ID is inserted for recording. An optical pickup having a temperature sensor attached to the optical disk having a media ID, which is transferred to a corresponding position in the optical disk to read the media ID when the optical disk having the media ID is inserted for recording; A nonvolatile memory for storing media ID and optimal recording power information of the optical disc corresponding to the media ID; Checks whether the media ID read through the optical pickup is stored in the memory, and if so, controls to output the optimal recording power stored with the media ID, and if not, performs the OPC to generate the optimal recording power. A controller configured to store the media ID and the optimal recording power at this time when the optimal recording power is generated by the OPC; And Under the control of the controller, the optimum recording power stored in the memory is output for data recording on the optical disc, or OPC is performed to generate the optimum recording power and then output the data to the controller. And an optimum recording power output section for outputting the optical disk recording and reproducing apparatus.