JP2003228832A - Method for recording on recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a recording medium recording method for recording on the full surface of an optical recording medium with optimal recording power, and to provide a recording device and an optical recording medium thereof. <P>SOLUTION: In the recording medium recording method for setting power for recording on an optical recording medium by using Running OPC (Optimum Power Calibration), a target β of the Running OPC is changed to carry out recording according to a medium used for recording and a recording radial position. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of recording on a recording medium.

[0002]

2. Description of the Related Art Optical information media have come into widespread use as represented by CDs (Compact Discs), and in recent years, write-once CDs (CD-Recordable) and rewritable CDs (CD-Rewritable) have become popular. It is spreading rapidly. In addition, DVDs are now under active development and are about to reach the market.

This is because the prices of commercially available writers and media are reduced, and a large amount of data that the user likes can be written using commercially available writers, and the recorded media are CD / DVD players that are already popular. This is because it is possible to play with. Therefore, the signal recorded by the writer must comply with the CD / DVD standard.

Recently, a large number of drives for recording at high linear velocity have been rapidly released, and media corresponding to high speed recording have also been released. When recording at high speed, the number of rotations is limited because the spindle motor of the recording device is limited. Therefore, the limit linear velocities are different between the inner circumference and the outer circumference, and usually, a method (Zone CLV) is used in which recording is performed by changing the recording linear velocity in each area.

However, when recording at high speed, the margin with respect to recording power is narrower (margin of item characteristics such as jitter and modulation degree is narrower) and recording power setting accuracy is higher than that at low speed recording. In addition, the recording characteristics of the optical recording medium are:
Dependence on the film thickness of the reflective layer, etc., causes the recording characteristics of the medium to differ from one to another due to production conditions, and the recent cost reduction of the optical recording medium reduces the cost, resulting in poor uniformity in the radial direction of the optical recording medium. I tended to.

Therefore, when the optical recording medium is inserted, the drive calibrates the recording power in the innermost peripheral portion, and uses the result to adjust the recording power so that the optimum recording characteristic can be obtained in the data portion. However, the current drive adjusts the recording power from the inner circumference to the outer circumference with the same target β to perform recording.

[0007]

However, in the conventional recording method, when the recording specification of the optical recording medium is different in the radial direction, or when the target β value is different from the recording linear velocity of the optical recording medium, There is a problem that recording cannot be performed with the optimum recording power over the entire surface of the recording medium.

Therefore, the present invention has been made to solve the above problems, and provides a recording method and a recording apparatus for a recording medium for recording on an optical recording medium with an optimum recording power over the entire surface, and an optical recording medium thereof. The purpose is to

[0009]

In order to solve the above-mentioned problems, in the invention according to claim 1, a Running OP is used.
C (Optimum Power Calibrati)
ON) is used to set the recording power of the optical recording medium, the running OPC is performed depending on the recording radial position according to the recording medium.
The most main feature is a recording method of a recording medium for recording while changing the target β of.

According to the second aspect of the invention, the difference in β value recorded on the optical recording medium before and after the portion where the target β is changed is
The main characteristic is the method of recording on the recording medium according to claim 1, which is within 6%.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION When an optical recording medium is recorded by a recording device, first, recording power is calibrated in the test recording area at the innermost peripheral portion to perform recording power calibration. Here, the following two methods are used for recording.

One method is Running OPC.
(Optimum Power Calibratio
By turning on n), the relationship between the reflected light intensity during recording and β after recording is obtained by recording power calibration, and the reflected light intensity that gives the target β value is set and set. The information area is recorded while adjusting the recording power so that the intensity of the reflected light is adjusted.

The other method is Running OPC.
(Optimum Power Calibratio
By turning off n), the relationship between the recording power and β after recording is obtained by recording power calibration,
The recording power at which the target β value is obtained is set, and the recording area is recorded with the set recording power.

As described above, the recording apparatus for the optical recording medium improves the recording quality of the optical recording medium in order to improve the running quality.
The OPC recording method is used. Information on the medium can be put in the optical recording medium, and the recording device can read the information.

By recording the recording characteristic information of the medium at each radial position in the medium, the recording device can perform recording according to the information.

The recording characteristics of the optical recording medium are the groove shape of the substrate,
It depends on the film thickness of the recording layer and the reflective layer, etc., and it is impossible to form completely the same in the inner circumference and the outer circumference in the process of producing the optical recording medium. There are internal and external differences in characteristics.

For example, CD-R / RW, DVD-R / R
An injection molding method is generally used to form a W substrate, but when this method is used, the groove shapes of the substrate formed on the inner circumference and the outer circumference are different.

1 and 2, a general CD-R / RW recording drive is used for a CD-R medium, and the inner circumference (R = 25 mm) and the middle circumference (R = 40 mm). ),
Recording characteristics (modulation degree, jitter) with respect to β when recording is performed at a linear velocity of 12x with recording power varied on the outer circumference (R = 56 mm) are shown. The jitter needs to be 35 ns or less, and the modulation degree needs to be 60% or more.

As is apparent from FIG. 1, the inner circumference, the middle circumference,
The recording characteristics are different at the outer circumference, and the characteristics are good at about 5% in the inner and middle circumferences, whereas the characteristics are good at about 0% at the outer circumference.

Table 1 shows β margins when recording was performed by varying the power at linear velocities from 8x to 20x (recording was performed in the middle circumference). As is clear from Table 1, the target β differs depending on each linear velocity.

[0021]

[Table 1]

In Zone CLV, the linear velocity is changed depending on the position and recording is performed on the medium. Therefore, good recording characteristics can be obtained by changing the target β value at each recording linear velocity for recording. When the target β value is different for each recording linear velocity, the β change amount becomes large in a certain area. Therefore, by slightly grasping the target β before changing the linear velocity, it is possible to perform recording without abruptly changing the β change amount.

Generally, the slower the linear velocity, the wider the β margin of the recording characteristics, and in the case of Zone CLV, the linear velocity gradually increases toward the outer circumference, so that the β value is set in the region of the linear velocity with the wide β margin. It is effective to change gradually.

[Example] CD-R media and CD-R /
Recording characteristics were evaluated with an RW drive. For the CD-R media, a polycarbonate substrate is formed, and a phthalocyanine-based compound is formed on the substrate to form a silver reflection film,
A medium was prepared by sequentially forming a protective layer of UV curable resin. RICOH MP7200A for recording drive
Recording was performed by varying the recording power with a drive, β and jitter were measured by DDU-1000 manufactured by Pulstec, and modulation was measured by CD-CATS manufactured by Audio-Development.

Example 1 Recording Characteristics at Radial Positions As shown in FIG. 1, the results of evaluation of recording characteristics at radial positions are shown. It can be seen that the optimum recording β value is different in the inner, middle and outer peripheral portions.

Example 2 Recording Characteristics at Each Linear Velocity As shown in Table 1, the results of evaluating the recording characteristics at each linear velocity are shown. Optimal recording β value and β at each linear velocity
You can see that there is a difference in the margin.

Example 3 β Change Amount and Playback Characteristics A medium was created by changing the target β value change amount at the middle portion (R = 40 mm), and the playback speed of that portion was measured. MP7200A drive (4
The evaluation was performed with a 0x playback drive).

As is apparent from Table 2, it can be seen that a large amount of β change causes a problem in reproduction. (If it can be played back at 40x, it means that the playback was possible without lead delay.) Also, in order to ensure the playback quality, the local β
The amount of change needs to be within 6%.

[0029]

[Table 2]

[0030]

As described above, claim 1 or 2
According to the described invention, when recording is performed on an optical recording medium having different recording characteristics at each radial position, the recording device identifies the medium and records at the optimum β on the medium, so that the entire surface is optimized. It can be written with various recording characteristics.

[Brief description of drawings]

FIG. 1 shows the inner circumference (R = 25 mm), the middle circumference (R = 40 mm), and the outer circumference (R = 56 mm) of a CD-R medium.
It is a figure which shows the jitter of the recording characteristic with respect to (beta) when recording is performed by changing the recording power at the linear velocity of 12x.

FIG. 2 shows the inner circumference (R = 25 mm), the middle circumference (R = 40 mm), and the outer circumference (R = 56 mm) of the CD-R medium.
It is a figure which shows the modulation | alteration degree of the recording characteristic with respect to (beta) when recording is performed by changing recording power with the linear velocity of 12x.

Claims (2)

[Claims] 1. A Running OPC (Optimu)
m Power Calibration)
In a recording method of a recording medium for setting a recording power to an optical recording medium, the recording is performed by changing the target β of the Running OPC according to the recording radial position according to the recording medium. Method. 2. The method for recording on a recording medium according to claim 1, wherein the difference in β value recorded on the optical recording medium before and after the portion where the target β is changed is within 6%.