KR20040067778A - Optical recording medium, method and apparatus for recording data thereon - Google Patents

Abstract

PURPOSE: A device for recording data on an optical recording medium is provided to set a low level of a recording power of a recording pattern to be higher than a bias power level, in order to sufficiently absorb heat on a recording film even when data is recorded at high speed, thereby improving edge characteristics of a recording mark. CONSTITUTION: A pickup unit(1) comprises as follows. A motor(11) rotates an optical disk(200). An optical head(13) irradiates a laser light on the optical disk(200), or receives the laser light reflected from the optical disk(200). A servo circuit(12) servos the motor(11) and the optical head(13). A laser driving circuit(14) drives a laser installed on the optical head(13). A channel modulator(3) modulates inputted data into channel bit strings, and outputs NRZI(Non Return to Zero Inverted) data. A recording waveform generation circuit(2) generates a recording waveform for recording the NRZI data, and supplies the recording waveform to the laser driving circuit(14). The laser driving circuit(14) controls the laser by using the recording waveform, and forms a mark or a space on the optical disk(200).

Description

Optical recording medium, method and apparatus for recording data thereon {Optical recording medium, method and apparatus for recording data thereon}

BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to the field of recording data on an optical recording medium, and more particularly, to an optical recording medium for storing information related to a writing strategy corresponding to high speed recording, and a method and apparatus for recording data thereto. will be.

Recording data on an optical disc, which is one of the optical recording media, means forming a mark on a track formed on the optical disc. In the case of a read-only disc such as a CD-ROM (Compact Disc Read Only Memory) or a DVD (Digital Versatile Disc) -ROM, the mark is formed of a pit. In the case of recordable discs such as CD-R (Recordable) / RW (Rewritable), DVD-R / RW / RAM (Random Access Memory), the recording layer is coated with a phase change film that changes crystalline or amorphous depending on temperature. It is formed through the phase change of the phase change film. In the case of such a recordable disc, a technique called a recording scheme is introduced in order to optimize recording / reproducing characteristics, and the recording scheme is applied differently according to the above disc. In addition, the recording conditions may vary depending on the drive, and thus there may be no compatibility between the optical recording medium and the drive.

On the other hand, in terms of signal detection, the data recording method may be divided into a mark edge recording method and a mark position recording method. According to the mark position recording method, the amplitude of the detected RF signal is changed from positive / negative to negative / positive at the position where the mark is recorded. According to the mark edge recording method, the amplitude of the detected RF signal is changed from positive / negative to negative / positive at both edges of the mark. Therefore, accurately recording the edges of the marks is an important factor in improving the quality of the reproduction signal.

However, in the case of a disk coated with a phase change film, the shape of the disk according to the conventional recording method is observed depending on the length of the mark or the spacing of the marks, that is, the length of the space. It can be seen that appears differently. In other words, the end of the mark is formed larger than the leading edge of the mark, thereby degrading the recording / reproducing characteristic. This is more so because of thermal accumulation when the length of the recording mark is relatively long.

1 is a reference diagram showing a recording waveform according to the conventional method.

Referring to Fig. 1, a conventional recording waveform for recording Non Return to Zero Inverted (NRZI) data is shown. Here, T means a period of the reference recording / reproducing clock signal. According to the mark edge recording method, the high level of NRZI data is recorded as a mark and the low level is formed as a space. The recording waveform used to record the mark is called a recording pattern, and the recording waveform used to form a space (used to erase the mark) is called an erase pattern. The conventional recording waveform uses multiple pulses as the recording pattern, and adjusts the power level of each pulse to three levels of Pw, Pe and Pb. That is, the power level of the recording multi-pulse constituting the recording pattern has Pw and Pb. In particular, it can be seen that the power Pe of the erase pattern for forming a space, which is a low level of NRZI data, is kept constant at a predetermined DC level. Here, Pw means writing power, Pb means bias power, and Pe means erase power.

As described above, since the erase pattern included in the conventional recording waveform maintains a constant DC level for a predetermined time, heat of about 0 to 200 ° C. is continuously applied to the corresponding area. Therefore, the repetitive recording of a plurality of times causes a deterioration and distortion in the shape of the mark, which significantly reduces the recording / reproducing characteristics. In particular, as the high density and high speed for recording more data on the disk is advanced, the period T of the reference recording / reproducing clock signal is reduced, which is more so in an environment in which thermal interference between pulses constituting the recording waveform is increased.

That is, conventionally, by erasing a region to be erased at the time of erasing with a DC level erasing power, recording / reproducing signals such as carrier to noise ratio (C / N) are reduced due to thermal interference between recording pulses. Incomplete formation results in partial crystallization, resulting in deterioration of reproduction characteristics. In particular, there is a problem in that distortion of the recording / reproducing signal becomes remarkably large when recording at high speed in order to increase the data transmission speed.

DISCLOSURE OF THE INVENTION In order to solve the above problems, it is an object of the present invention to provide an optical recording medium for storing information related to a recording scheme corresponding to high speed recording, a method for recording data thereon, and an apparatus thereof.

It is another object of the present invention to provide an optical recording medium for storing information related to a recording waveform capable of recording a mark having an improved edge shape even at a high speed recording, a method for recording data with the recording waveform, and an apparatus thereof. There is.

It is still another object of the present invention to provide an optical recording medium for storing information relating to a recording waveform for a phase change optical disk, a method for recording data with the recording waveform, and an apparatus thereof.

Still another object of the present invention is an optical recording medium for storing information relating to a recording waveform which minimizes distortion of a recording mark due to thermal interference between adjacent marks during recording in a mark edge recording method, which records data with the recording waveform. A method and apparatus are provided.

Still another object of the present invention is an optical recording medium for storing information related to a recording waveform which can further suppress distortion of the shape of the first and end portions of a mark and can suppress deterioration due to repetitive recording, the recording waveform The present invention provides a method and apparatus for recording data.

Still another object of the present invention is that additional information on a recording pattern forming a mark and / or an erasing pattern forming a space is recorded so that the optical power can be easily found an optimal power level required for data recording no matter which drive is inserted. The present invention provides a recording medium, a method of recording data, and an apparatus thereof.

It is still another object of the present invention to provide an optical recording medium for storing information related to a recording waveform that optimizes jitter characteristics, a method for recording data with the recording waveform, and an apparatus thereof.

Another object of the present invention is to provide an optical recording medium for storing information relating to a time ratio of a time duration of a multi-pulse and a time duration of a last pulse in a recording waveform, in order to minimize jitter characteristics, and recording data with the recording waveform. A method and apparatus are provided.

It is still another object of the present invention to provide an optical recording medium for storing information relating to a cooling time duration of a last pulse of a recording waveform in order to minimize jitter characteristics, a method of recording data with the recording waveform, and an apparatus thereof. .

1 is a reference diagram showing a recording waveform according to the conventional method;

2 is a block diagram of a recording apparatus according to a preferred embodiment of the present invention;

3 is an implementation example of FIG. 2;

4 to 7 show examples of recording waveforms generated by the recording waveform generating circuit;

8 is a waveform diagram for explaining four types of erase patterns applied to the present invention;

9 is an example of a recording waveform for reducing jitter in accordance with the present invention;

FIG. 10 is a graph showing the relationship between jitter and recording power according to the ratio of the time duration of the multi-pulse to the time duration of the last pulse in the recording waveform shown in FIG. 9;

FIG. 11 is a graph showing the relationship with jitter according to the cooling time duration of the last pulse in the recording waveform shown in FIG. 9;

12 is a flowchart for explaining a recording method according to an exemplary embodiment of the present invention.

The above object is an optical recording medium capable of recording, erasing and reproducing data according to the present invention, wherein: recording additional information including power information corresponding to high-speed recording of a recording pattern for data recording is provided in a partial region of the recording layer. It is achieved by an optical recording medium, characterized in that the recording on the.

Wherein the recording pattern is a recording multi-pulse, the recording multi-pulse has at least a high level and a low level of recording power, and records power information in which the low level of the recording power is set higher than the bias power level. It is preferable.

According to another aspect of the present invention, there is provided a method of recording data on an optical recording medium, comprising: (a) generating a recording waveform having a recording pattern corresponding to a high speed recording; And (b) forming a first level of the digital data into a mark and forming a second level into a space using the generated recording waveform.

In addition, the above object is a method of recording data on an optical recording medium, comprising: (a) generating a recording waveform having a recording pattern corresponding to high-speed recording and an erase pattern comprising multi-pulse; And (b) forming a first level of the digital data into a mark and forming a second level into a space by using the generated recording waveform.

According to another aspect of the present invention, there is provided an apparatus for recording data on an optical recording medium, comprising: a recording waveform generating circuit for generating a recording waveform having a recording pattern corresponding to high-speed recording of input data; And a pickup unit that forms a mark or forms a space for recording the data by irradiating light onto the optical recording medium in accordance with the generated recording waveform.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

2 is a block diagram of a recording apparatus according to a preferred embodiment of the present invention.

Referring to FIG. 2, a recording apparatus is an apparatus for recording data by forming marks or forming spaces on an optical recording medium 200, which includes a pickup unit 1, a recording waveform generating circuit 2, and a channel modulator 3; It is provided.

The channel modulator 3 modulates data input from the outside into channel bit strings. The write waveform generating circuit 2 is provided with a channel bit string and generates a write waveform for recording it. The recording waveform generated in accordance with the present invention includes a recording pattern corresponding to high speed recording and an erase pattern having erased multi-pulses. Detailed description of the recording waveform will be given later. The pickup unit 1 irradiates light to the optical recording medium 200 in accordance with the generated recording waveform to form a mark or a space.

3 is an embodiment of FIG. 2. However, for the block performing the same function, the same reference numerals as those of FIG. 2 are assigned, and repeated description thereof will be omitted.

Referring to Fig. 3, the recording apparatus includes a pickup unit 1, a recording waveform generation circuit 2 and a channel modulator 3. The pickup unit 1 includes a motor 11 for rotating the optical disk 200, an optical head 13 for irradiating laser light to the optical disk 200 or receiving laser light reflected from the optical disk 200. ), A servo circuit 12 for servo control of the motor 11 and the optical head 13, and a laser drive circuit 14 for driving a laser (not shown) provided in the optical head 13.

The channel modulator 3 outputs NRZI (Non Return to Zero Inverted) data by modulating the input data into a channel bit string. The recording waveform generating circuit 2 generates a recording waveform for recording NRZI data and provides it to the laser driving circuit 14 provided in the pickup section 1. The laser drive circuit 14 forms a mark or a space on the optical disc 200 by controlling the laser using the received recording waveform.

4 is an example of a recording waveform generated by the recording waveform generating circuit 2 and for improving the edge characteristic of the mark during recording.

The NRZI data depends on the modulation scheme of the channel modulator 3. When recording using the RLL (1,7) series, the minimum recording mark is 2T and the maximum recording mark is 8T. In addition, when modulating with the Run Length Limited (RLL) (2,10) series, that is, the minimum mark according to EFM (Eight to fourteen Modulation), EFM + (Eight to fourteen Modulation plus), D (8-15), and Dual modulation. The length is 3T and the maximum mark length is 11T. Here, D (8-15) refers to a modulation method published by ODS (Optical Data Storage) in 2001 in the Optical Disc Recording System of 25GB Capacity. Dual modulation is filed by the applicant on September 30, 1999 and published on November 25, 2000, Korean Patent Application No. 99-42032 “RLL code placement method, modulation and demodulation method and demodulation method with improved DC suppression capability. Device ”.

In this embodiment, when the high level of the NRZI data is formed as a mark and the low level is formed as a space, the recording waveform is a recording pattern for recording a mark having a length of 7T, and an erase pattern for forming a space having a length of 3T. And NRZI data including a recording pattern for recording a mark having a length of 3T.

Referring to Fig. 4, the recording pattern for recording a mark having a length of 7T in three recording waveforms 1,2 and 3 for NRZI data is a recording multipulse, which is more strictly divided into a first pulse. , A multi-pulse train and a last pulse (also called a cooling pulse). The recording pattern for recording a mark having a length of 3T includes a leading pulse and a last pulse. The number of recording multi-pulses is recorded in a recording pattern having (N-1) * Tw pulses for a mark having a length of each T from minimum to longest in forming a mark of N * Tw (N is a natural number). An example is shown. That is, a mark having a length of 3T is formed into a recording pattern having two pulses, and a mark having a length of 7T is formed into a recording pattern having six pulses.

The power level of the head pulse and the multi-pulse string of the recording pattern has two levels Pw1 and Pw2. Here, Pw1 means a high level of the recording power, and Pw2 means a low level of the recording power. The low level Pw2 of this writing power is set higher than the bias power level Pb. The last pulse of the recording pattern has a recording power high level Pw1 and a bias power level Pb.

This can reduce the total power delivered to record the mark if the data is recorded at high speed to increase the data transfer rate (when the period T of the reference record / playback clock signal is reduced), resulting in distortion in the shape of the record mark. Therefore, as the rotational speed of the disc increases, there is a need to increase the recording power. By setting the low level Pw2 of the recording power higher than the bias power level Pb, it is possible to sufficiently absorb the heat from the recording film to form the recording mark even at a high speed. do.

In an embodiment of the present invention, the erase pattern is also configured as a pulse train. The erase pattern may have a DC level as in the prior art, but more preferably, it is composed of erase multi-pulses rather than the erase pattern of the DC level. The erase multi-pulse has two power levels Ppe and Pbe. Here, Ppe means peak erase power and may be referred to as a high level of erase power, and Pbe may mean bias erase power and may be referred to as a low level of erase power.

The recording waveform 1 is set equal to the erase power level Pe in which the bias erase power level Pbe of the erase pattern is set to the existing DC level, and the write waveform 2 has the peak erase power level Ppe of the erase pattern equal to the existing erase power level Pe. Similarly, the recording waveform 3 is set such that the existing erase power level Pe exists between the peak erase power level Ppe and the bias erase power level Pbe of the erase pattern.

The sum of the times for holding the two power levels Ppe and Pbe of the erase multi-pulse present in the erase pattern of the present invention is 0.25 to 2.0Tw for the timing window Tw (corresponding to the period of the reference recording / reproducing clock signal). The recording / reproducing characteristics can be further improved by recording so that the holding time suitable for the thermal characteristics of the disc is selected by adjusting within the range of.

In FIG. 4, the sum of the holding times of Ppe and Pbe of the erase multi-pulse for forming 3T is 1.0 Tw with respect to the timing window. The high level period of the first pulse of the erase multi-pulse is about 0.5 Tw, and the high level period of the last pulse may be kept somewhat longer than 0.5 Tw.

In addition, in the embodiment shown in Fig. 4, the period of the multi-pulse of the recording pattern is set to 1.0Tw, and the low level Pw2 of the recording power is set higher than the bias power level Pb to record with a power level higher than the peak erase power level Ppe. It has a power level lower than the high level Pw1 of power, and thus has a relationship of Ppe? Here, the low level Pw2 of the write power may be set lower than the peak erase power level Ppe of the erase pattern and higher than the bias erase power level Pbe to have a relationship of Pbe ≦ Pw2 ≦ Ppe or have a power level lower than the bias erase power level Pbe. It may have a relationship of Pbe≥Pw2. The level of the region to be Pb has a power level lower than the low level Pw2 of the recording power, so that Pb≤Pw2, and the level of the region to be Pb has a power level lower than the peak erase power level Ppe, so that Pb≤Ppe Has a relationship with

FIG. 5 is an example of a recording waveform generated by the recording waveform generating circuit 2 and having the number of multi-pulses in the recording pattern having int (N / 2 * T), which is different from the recording waveform shown in FIG. I will explain only. int stands for integer.

Referring to Fig. 5, by setting the period of the multi-pulse of the recording pattern to 2Tw in the three recording waveforms 4,5 and 6 for the NRZI data, it is sufficient to increase the amount of incident light on the disk without significantly increasing the recording power and the erasing power. A recording mark of good quality can be formed to improve the recording / playback characteristics of the disc. For a mark having a length of short T such as 3T, the period of the pulse may not be 2Tw.

FIG. 6 is an example of a recording waveform generated by the recording waveform generating circuit 2 and having a time duration of 2 Tw of the power level of the multi erasing pulse, which is different from the recording waveform shown in FIG. I will explain only.

Referring to FIG. 6, in three recording waveforms 7,8 and 9 for NRZI data, the sum of the time durations of the peak erase power level Ppe and the bias erase power level Pbe of the erase multi-pulse constituting the erase pattern is added to the timing window. The case of 2Tw is shown. The high level period of the erase multi-pulse is kept somewhat longer than 1.0Tw, and the low level period may be kept slightly shorter than 1.0Tw.

FIG. 7 is an example of a recording waveform generated by the recording waveform generating circuit 2 and having a time duration of 2 Tw of the levels of the multi-pulse of the recording pattern and the multi-pulse of the erasure pattern, compared with the recording waveform shown in FIG. 4. Only different points will be described.

Referring to FIG. 7, in the three recording waveforms 10, 11 and 12 for the NRZI data, the period of the multi-pulse of the recording pattern represents 2Tw, and the period of the multi-pulse of the erase pattern represents 2Tw. Similarly to the recording waveform shown in FIG. 6, the sum of the time durations of the peak erase power level Ppe of the erase multi-pulse and the bias erase power level Pbe is 2Tw with respect to the timing window.

8 is a waveform diagram for explaining four types of erase patterns applied to the present invention.

Referring to FIG. 8, the recording waveform according to the present invention may have four types of erase patterns: (a) LH, (b) LL, (c) HH, and (d) HL. Dotted circles indicate the differences between the erase patterns. First, (a) LH refers to a case where the power level of the first pulse constituting the erase pattern is the low level among the two power levels present in the erase pattern, and the power level of the last pulse constituting the erase pattern is the high level. (b) LL refers to a case where the power levels of the first pulse and the last pulse constituting the erase pattern are the low level among the two power levels present in the erase pattern. (c) HH refers to a case where the power levels of the first pulse and the last pulse constituting the erase pattern are the high level among the two power levels present in the erase pattern. (d) HL denotes a case where the power level of the first pulse constituting the erase pattern is a high level among the two power levels existing in the erase pattern, and the power level of the last pulse constituting the erase pattern is a low level.

In the example illustrated in FIG. 8, the period of the multi-pulse of the recording pattern is 1Tw and the period of the multi-pulse of the erase pattern is 2Tw, as shown in the recording waveforms 7,8, and 9 of FIG. 6. 4, in which the recording waveforms 1,2 and 3 are shown in which the period of the multi-pulse of the multi-pulse of the erase pattern is 1Tw, and the period of the multi-pulse of the recording pattern of the recording pattern is 2Tw and the period of the multi-pulse of the erase pattern is 1Tw 5, in which waveforms 4, 5, and 6 are shown, and in which recording waveforms 10, 11, and 12, in which the period of the multi-pulse of the recording pattern and the period of the multi-pulse of the erase pattern are 2Tw, are applicable.

That is, although the recording waveforms shown in Figs. 4 to 7 all show examples of the HH type, all of the HL type, LH type, and HH type are applicable. The determination of the type depends on the length of the mark formed by the recording pattern present before and after the erase pattern. That is, any one of the above four types of erase patterns is adaptively determined according to the length of the mark formed before and / or after the space formed by the erase pattern.

On the other hand, the information (type information) relating to these four types of erase patterns may be recorded in a certain area, for example, a lead-in area of the recordable disc or carried as one of the header information by the wobble signal. Can be. Therefore, when recording data, the recording apparatus can read the type information from the lead-in area or the wobble signal to generate the corresponding recording waveform to form marks and spaces.

Furthermore, the four types of erase patterns can be used as symbols indicating the speed of the disc or the type of the mark in recording / reproducing. For example, it is possible to display information that " a disc using an LH type erase pattern has a double speed of 20 ".

Furthermore, not only the information about the four types of erase patterns, but also the recording powers according to the recording pattern of the present invention, erase powers according to the erase pattern, other types of discs, disc sizes, types of disc recording films (single layer / Multi-layer) or the like can be recorded. In particular, the recording pattern information on the time ratio of the time duration of the multi-pulse and the time duration of the last pulse and the cooling time duration of the last pulse among the recording pulses optimizing the jitter characteristic shown in FIG. 9 may also be recorded.

When the optical recording medium having such information recorded therein is inserted into the recording apparatus, the recording apparatus does not need to perform separate test recording for selecting the optimal recording power and erasing power, or it is tested based on the stored powers and the recording pattern information. By recording, the time taken to determine the optimal power levels can be shortened.

9 is an example of a recording waveform for reducing jitter in accordance with the present invention.

9A is an example of NRZI data, in which when the high level of the NRZI data is formed as a mark and the low level is formed as a mark, the recording waveform is a recording pattern for recording a mark having a length of 7T, the length of 3T. An erase pattern for forming a spacer having a space and a recording pattern for recording a mark having a length of 3T.

FIG. 9B is a general recording waveform for the NRZI data shown in FIG. 9A, where Ttop is the time duration of the leading pulse, and Tmp is the time duration of each pulse in the multi-pulse string (hereinafter referred to as multipulse). Tlp is the time duration of the last pulse, and Tcl is the cooling time duration of the last pulse.

9 (c) is a recording waveform proposed in the present invention, wherein the power levels of the head pulse and the multi-pulse string have two levels Pw1 and Pw2. The low level Pw2 of this writing power is set higher than the bias power level Pb. The last pulse of the recording pattern has a recording power high level Pw1 and a bias power level Pb. The erase pattern has a DC level as in the prior art.

9 (d) is a recording waveform proposed in the present invention, wherein the power levels of the head pulse and the multi-pulse string have two levels Pw1 and Pw2. The low level Pw2 of this writing power is set higher than the bias power level Pb. The last pulse of the recording pattern has a recording power high level Pw1 and a bias power level Pb. The erase pattern consists of an erase multi-pulse of peak erase power Ppe and bias erase power level Pbe. The bias erase power level Pbe of the erase pattern is set equal to the erase power level Pe set to the conventional DC level, and the sum of the sustain times of Ppe and Pbe of the erase multi-pulse is 1.0Tw for the timing window.

On the other hand, for the recording waveforms shown in Figs. 9C and 9D proposed by the present invention, the jitter characteristic is found by changing the time duration Tmp of the multi-pulse and the time duration Tlp of the last pulse to find the optimal recording conditions. 10 is a graph showing jitter characteristics by changing the cooling time duration Tcl of the last pulse to find an optimal recording condition.

FIG. 10 is a graph showing the relationship between jitter and recording power according to the ratio of the time duration of the multi-pulse to the time duration of the last pulse in the recording waveform shown in FIG. 9, wherein the recording condition is the minimum recording mark at a wavelength of 400 nm. Size 0.149 m (corresponding to 2Tw, which is the minimum recording mark size when RRL (1,7) codes are used), the larger the ratio of Tlp / Tmp becomes when the bias power Pb is 0.2mW and the erase power Pe is 1.2mW. The recording power tends to be small but increases in terms of jitter. From these results, an appropriate range of Tlp can be obtained.

When the range of jitter allowed by the system is set to 7% through FIG. 10, the range of Tlp / Tmp ratio is 0.9. It can be seen that it is about 1.3. Although not shown in the figure, when the jitter range is set to 8%, the ratio of Tlp / Tmp ratio is 0.7. 1.4 or so. Thus, the range of Tlp / Tmp ratios may be determined according to the range of jitter allowed by the system.

FIG. 11 is a graph showing the relationship with jitter according to the cooling time duration of the last pulse in the recording waveform shown in FIG. 9. When the jitter is measured by changing the magnitude of the cooling time duration Tcl of the last pulse, the size of Tcl is increased. It can be seen that as the minimum recording mark 2Tw is approached, jitter continues to decrease. The most preferable size of Tcl in consideration of the jitter characteristic corresponds to the minimum recording mark 2Tw.

However, you can size Tcl according to the range of jitter allowed by the system. For example, if the allowable range of jitter is 7%, the size of Tcl is 0.7Tw. Determined within 2.0 Tw, and the allowable range of jitter is 8%, the size of Tcl is 0.5 Tw It is set within 2.0Tw. Here, the minimum value of Tcl depends on the range of jitter allowed by the system, and the maximum value of Tcl depends on the size of the minimum recording mark.

A recording method according to a preferred embodiment of the present invention based on the configuration as described above is as follows.

12 is a flowchart for explaining a recording method according to an exemplary embodiment of the present invention.

Referring to FIG. 12, the recording apparatus receives data from an external source and modulates it to generate NRZI data (step 1201). Next, in order to correspond to high-speed recording and to improve the mark edge characteristic, a recording waveform having a recording pattern in which the low level of the recording power according to the present invention is set at least higher than the bias power level and the erase pattern including the multi-pulse is generated ( Step 1202). Subsequently, marks or spaces are formed on the optical disk using the generated recording waveform (step 1203).

On the other hand, although the above-described recording waveforms have been described only for 7T and 3T, it is easy for those skilled in the art to generate recording patterns and erasing patterns that form marks and spaces for 2T, 4-6T, and 8 to longest T based on this.

In addition, when the number of multi-pulses of the recording pattern forms a mark of N * Tw (N is a natural number), as described above, the recording pulses have (N-1) * Tw for each mark having a length of T. Not only the recording method used but also the recording method such as a DVD-RAM using (N-2) * Tw pieces, the embodiment of the present invention can improve recording / playback characteristics.

As described above, the present invention sets the low level of the recording power of the recording pattern higher than the bias power level at the time of recording to sufficiently absorb heat from the recording film even at high-speed recording, thereby making it more effective in improving the edge characteristics of the recording marks. .

The present invention improves recording / reproducing characteristics by suppressing distortion of the shape of the leading part and the last part of the recorded mark by adding the erase power level in the form of a pulse.

The present invention further improves recording / reproducing characteristics by adjusting the holding time of the erase power high level and the low level in the range of 0.25 to 2.0 Tw with respect to the timing window Tw to select and record a holding time suitable for the thermal characteristics of the disc. do.

According to the present invention, when the recording multi-pulse and erasing multi-pulse periods are set to 2.0 Tw, a recording mark of sufficiently high quality can be formed by increasing the amount of incident light on the disk without significantly increasing the recording power and erasing power. Can be improved.

The present invention allows the time duration of the last pulse of the recording waveform to have an appropriate time ratio with respect to the time duration of the multi-pulse, so that the jitter characteristic can be improved to improve the recording / reproducing characteristic.

In addition, the present invention can set the cooling time duration of the last pulse of the recording waveform to a predetermined range so as to have an optimum jitter characteristic and improve the recording / reproducing characteristic.

Claims (69)

In an optical recording medium capable of recording, erasing and reproducing data: An optical recording medium, wherein recording additional information including power information corresponding to high-speed recording of a recording pattern for data recording is recorded in a portion of the recording layer. 2. The recording pattern of claim 1, wherein the recording pattern is a recording multipulse consisting of a leading pulse, a multipulse sequence, and / or a last pulse, wherein the recording multipulse has at least a high level and a low level of the recording power, and the recording power. And recording power information whose low level is set higher than the bias power level. The method of claim 2, further comprising power information for an erase pattern for erasing data that is an erase multi-pulse, wherein the erase multi-pulse has a high level and a low level of erase power, and a low level of erase power is predetermined. The DC level is set equal to an existing erase power level having a DC level, or the high level of the erase power is set equal to the DC level, or the DC level is between the high level of the erase power and the low level of the erase power. And recording power information set to exist. 4. The optical recording medium of claim 3, wherein the time duration of the last pulse has a range of time ratios relative to the time duration of the multi-pulse, depending on the range of jitter allowed by the system. 5. The method of claim 4, wherein the time duration of the last pulse is 0.9 relative to the time duration of the multi-pulse if the range of jitter allowed by the system is 7%. An optical recording medium having a time ratio of 1.3. 5. The time duration of the last pulse is 0.7 relative to the time duration of the multi-pulse if the range of jitter allowed by the system is 8%. An optical recording medium having a time ratio of 1.4. 4. The optical recording medium of claim 3, wherein the minimum value of the length of the cooling time duration of the last pulse is set depending on the range of jitter allowed by the system, and the maximum value is set depending on the length of the minimum recording mark. . An optical recording medium according to claim 7, wherein the length of the cooling time duration of the last pulse of the recording pattern is set to the length of the minimum recording mark. The optical recording medium of claim 2, wherein the power for the erase pattern for erasing the data has a predetermined DC level. 10. The optical recording medium of claim 9, wherein the time duration of the last pulse has a range of time ratios relative to the time duration of the multi-pulse depending on the range of jitter allowed by the system. 11. The method of claim 10 wherein the time duration of the last pulse is 0.9% relative to the time duration of the multi-pulse if the range of jitter allowed by the system is 7%. An optical recording medium having a time ratio of 1.3. The time duration of the last pulse is 0.7 relative to the time duration of the multi-pulse if the range of jitter allowed by the system is 8%. An optical recording medium having a time ratio of 1.4. 10. The optical recording medium of claim 9, wherein the minimum value of the length of the cooling time duration of the last pulse is set depending on the range of jitter allowed by the system, and the maximum value is set depending on the length of the minimum recording mark. . The optical recording medium according to claim 13, wherein the length of the cooling time duration of the last pulse of the recording pattern is set to the length of the minimum recording mark. The erase pattern information according to claim 1, further comprising erasing pattern information including information on the power level of the head pulse and the last pulse of the erase pattern for erasing the data in a portion of the recording layer. Optical recording media. The power level of the first type of the first pulse and the last pulse constituting the erase pattern are high levels among the erase power levels, and the power level of the first pulse constituting the erase pattern is the erase power level. Power level of the last pulse constituting the erase pattern, and the power level of the last pulse constituting the erase pattern is a high level among the erase power levels The power level of the last pulse constituting the pattern is the third type which is the low level among the erase power levels, and the power level of the head pulse and the last pulse constituting the erase pattern is all the fourth among the low levels among the erase power levels. An optical recording medium, wherein one is recorded. In a method of recording data on an optical recording medium: Generating a recording waveform having a recording pattern corresponding to a high speed recording; And Forming a first level of the digital data into a mark and forming a second level into a space using the generated recording waveform. 18. The recording pattern according to claim 17, wherein the recording pattern is composed of recording multi pulses consisting of a leading pulse, a multi pulse train, and / or a last pulse, wherein the recording multi pulses have at least a high level and a low level of recording power, and the recording power. And the low level of is set higher than the bias power level. 19. The method of claim 18, wherein the power for the erase pattern for erasing the data has a predetermined DC level. 20. The method of claim 19, wherein the time duration of the last pulse has a range of time proportions to the time duration of the multi-pulse depending on the range of jitter allowed by the system. 21. The method of claim 20, wherein the time duration of the last pulse is 0.9 relative to the time duration of the multi-pulse if the range of jitter allowed by the system is 7%. And a time ratio of 1.3. 21. The time duration of the last pulse is 0.7 relative to the time duration of the multi-pulse if the range of jitter allowed by the system is 8%. Characterized in that it has a time ratio of 1.4. 20. The method of claim 19, wherein the minimum of the length of the cooling time duration of the last pulse is set depending on the range of jitter allowed by the system, and the maximum is set depending on the length of the minimum recording mark. 24. The method of claim 23, wherein the length of the cooling time duration of the last pulse of the recording pattern is set to the length of the minimum recording mark. In a method of recording data on an optical recording medium: Generating a recording waveform having a recording pattern corresponding to a high speed recording and an erase pattern including multiple pulses; And Forming a first level of the digital data into a mark and forming a second level into a space using the generated recording waveform. The recording pattern according to claim 25, wherein the recording pattern is composed of recording multi pulses consisting of a leading pulse, a multi pulse train, and / or a last pulse, wherein the power level of the recording multi pulses has a high level and a low level of the recording power. And the low level of the write power is set higher than the bias power level for the last pulse of the write multi-pulse. 27. The method of claim 26, wherein the period of the write multi-pulse is adjusted in the range of 0.25 to 2.0 Tw with respect to the timing window Tw. 28. The method of claim 27, wherein the period of the write multi-pulse has 1.0 Tw with respect to the timing window Tw. 28. The method of claim 27, wherein the period of the write multi-pulse has 2.0 Tw with respect to the timing window Tw. 27. The method of claim 26, wherein the power level of the multi-pulse constituting the erase pattern is periodically changed to at least two levels, that is, the high level Ppe and the low level Pbe of the erase power. The method of claim 30, wherein the low level Pw2 of the write power has a power level higher than the high level Ppe of the erase power, has a power level lower than the high level Pw1 of the write power, and has a relationship of Ppe? Pw2? Pw1. How to. 31. The method of claim 30, wherein the low level Pw2 of the write power has a power level higher than the high level Ppe of the erase power, has a power level lower than the low level Pbe of the erase power, and has a relationship of Pbe ≦ Pw2 ≦ Ppe. How to. 31. The method of claim 30, wherein the low level Pw2 of the write power has a power level lower than the low level Pbe of the erase power and has a relationship of Pbe > Pw2. 31. The method of claim 30, wherein the bias power level Pb has a power level lower than the low level Pw2 of the write power and has a relationship of Pb < Pw2. 31. The method of claim 30, wherein the bias power level Pb has a power level lower than the high level Ppe of the erase power and has a relationship of Pb < Ppe. The method of claim 30, wherein the low level Pbe of the erase power of the erase pattern is set to an existing erase power level of a predetermined DC level, or the high level Ppe of the erase power of the erase pattern is set to the DC level, or the erase And the DC level is present between the high level Ppe of the erase power of the pattern and the low level Pbe of the erase power. 31. The method of claim 30, wherein the time duration of the multi-pulse constituting the erase pattern, i.e., the sum of the time intervals of Ppe and Ppb, is adjusted in the range of 0.25 to 2.0 Tw with respect to the timing window Tw. 38. The method of claim 37, wherein the time duration of the multi-pulses constituting the erase pattern, i.e., the sum of the time intervals of Ppe and Ppb, has a period of 1.0 Tw with respect to the timing window Tw. 38. The method of claim 37, wherein the time duration of the multi-pulses constituting the erase pattern, i.e., the sum of the time intervals of Ppe and Ppb, has a period of 2.0 Tw with respect to the timing window Tw. 27. The method of claim 26, wherein the time duration of the last pulse has a range of time proportions to the time duration of the multi-pulse depending on the range of jitter allowed by the system. 41. The time duration of the last pulse is 0.9 relative to the time duration of the multi-pulse if the range of jitter allowed by the system is 7%. And a time ratio of 1.3. 41. The time duration of the last pulse is 0.7 relative to the time duration of the multi-pulse if the range of jitter allowed by the system is 8%. Characterized in that it has a time ratio of 1.4. 27. The method of claim 26, wherein the minimum value of the length of the cooling time duration of the last pulse is set depending on the range of jitter allowed by the system, and the maximum value is set depending on the length of the minimum recording mark. 44. The method of claim 43, wherein the length of the cooling time duration of the last pulse of the recording pattern is set to the length of the minimum recording mark. 27. The method of claim 26, wherein the method And recording the power information relating to the generated recording waveform in a partial area of the recording layer. 46. The method of claim 45, wherein the method And recording information on the pattern of the recording multi-pulse in a partial area of the recording layer. The method of claim 46 wherein the method is And erasing the erase pattern information including information on the power level of the head pulse and the last pulse of the erase pattern for data erasing in a partial region of the recording layer. 48. The power supply type of claim 47, wherein a power level of a first pulse and a last pulse constituting the erase pattern is a high level among the erase power levels, and a power level of the first pulse constituting the erase pattern is the erase power level. Power level of the last pulse constituting the erase pattern, and the power level of the last pulse constituting the erase pattern is a high level among the erase power levels The power level of the last pulse constituting the pattern is the third type which is the low level among the erase power levels, and the power level of the head pulse and the last pulse constituting the erase pattern is all the fourth among the low levels among the erase power levels. The method in which one is recorded. An apparatus for recording data on an optical recording medium: A recording waveform generation circuit for generating a recording waveform having a recording pattern corresponding to high-speed writing of input data; And And a pickup unit for forming a mark or forming a space for recording the data by irradiating light onto the optical recording medium according to the generated recording waveform. The recording pattern according to claim 49, wherein the recording pattern is composed of recording multi pulses consisting of a leading pulse, a multi pulse train and / or a last pulse, wherein the power level of the recording multi pulse has at least a high level and a low level of recording power, And the low level of the write power is set higher than the bias power level. 51. The method of claim 50, wherein the write waveform further comprises an erase pattern for erasing data consisting of multiple pulses, wherein the power level of the erase multi-pulse has a high level Ppe and a low level Pbe of erase power, and the erase power is low. The level is set equal to the existing erase power level of a predetermined DC level, or the high level of the erase power is set equal to the DC level, or the DC between the high level of the erase power and the low level of erase power. And the level is one of which is set to exist. 52. The apparatus of claim 51, wherein the periods of the write multi pulse and the erase multi pulse are adjusted in a range of 0.25 to 2.0 Tw with respect to the timing window Tw. The low power level Pw2 of the recording power has a power level higher than the high level Ppe of the erase power, has a power level lower than the high level Pw1 of the recording power, and has a relationship of Ppe ≦ Pw2 ≦ Pw1. Device. 53. The method of claim 51, wherein the low level Pw2 of the write power has a power level higher than the high level Ppe of the erase power, has a power level lower than the low level Pbe of the erase power, and has a relationship of Pbe ≦ Pw2 ≦ Ppe. Characterized in that the device. 52. The apparatus of claim 51, wherein the low level Pw2 of the write power has a power level lower than the low level Pbe of the erase power and has a relationship of Pbe > Pw2. 53. The apparatus of claim 51, wherein the bias power level Pb has a power level lower than the low level Pw2 of the write power and has a relationship of Pb < Pw2. 53. The apparatus of claim 51, wherein the bias power level Pb has a power level lower than the high level Ppe of the erase power and has a relationship of Pb < Ppe. 53. The apparatus of claim 51, wherein the time duration of the last pulse has a range of time ratios relative to the time duration of the multi-pulse depending on the range of jitter allowed by the system. 59. The time duration of the last pulse is 0.9 relative to the time duration of the multi-pulse if the range of jitter allowed by the system is 7%. Device having a time ratio of 1.3. 59. The time duration of the last pulse is 0.7 relative to the time duration of the multi-pulse if the range of jitter allowed by the system is 8%. Device having a time ratio of 1.4. 53. The apparatus of claim 51, wherein the minimum of the length of the cooling time duration of the last pulse is set depending on the range of jitter allowed by the system, and the maximum is set depending on the length of the minimum recording mark. 64. The apparatus of claim 61, wherein the length of the cooling time duration of the last pulse of the recording pattern is set to the length of the minimum recording mark. 51. The apparatus of claim 50, wherein the power for the erase pattern for erasing data has a predetermined DC level. 64. The apparatus of claim 63, wherein the time duration of the last pulse has a range of time ratios relative to the time duration of the multi-pulse depending on the range of jitter allowed by the system. 65. The method of claim 64, wherein the time duration of the last pulse is 0.9 relative to the time duration of the multi-pulse if the range of jitter allowed by the system is 7%. Device having a time ratio of 1.3. 65. The time duration of the last pulse is 0.7 relative to the time duration of the multi-pulse if the range of jitter allowed by the system is 8%. Device having a time ratio of 1.4. 64. The apparatus of claim 63, wherein a minimum of the length of the cooling time duration of the last pulse is set according to the range of jitter allowed by the system, and the maximum is set depending on the length of the minimum recording mark. 68. The apparatus of claim 67, wherein the length of the cooling time duration of the last pulse of the recording pattern is set to the length of the minimum recording mark. 64. The apparatus of claim 63, wherein the period of the write multi-pulse is adjusted in a range of 0.25 to 2.0 Tw with respect to the timing window Tw.