JP2002230770A - Recording control method and optical disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide recording technology of an optical disk capable of optimizing recording conditions. SOLUTION: In an optical disk device in which a recordable and reproducible optical disk rotates at a constant linear velocity, test writing is performed before recording information data, written data for trial are reproduced, a difference of data width between reproduced data and reference data is detected in a reproduced data processing means, and an error signal is generated. By generating an error correction control signal corresponding to an error portion and performing time width control of an output pulse width of a recording laser to the generated error signal, pulse waveform control is carried out so that the recording data width may become identical with the reference data width and the recording conditions of data may be optimized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk recording control method and an optical disk apparatus, and more particularly to a technique for optimizing data recording during recording.

[0002]

2. Description of the Related Art In an optical recording / reproducing apparatus using an optical disk, information is reproduced and recorded by irradiating the optical disk with a light beam using a semiconductor laser or the like as a light source. Information to be recorded is converted into data for recording in accordance with the modulation rule of the optical disc, and recording data is generated. The recording data of the CD system is EFM modulated (EFM) based on the cycle T of the channel clock.
right Fourteen Modulation)
Is converted into 9 types of data having a data width of 3T to 11T. The optical disk is irradiated with a light beam whose output power and emission time width are controlled according to the recording data, and recording is performed by forming marks and space data on the optical disk. When a reproduction light beam is irradiated on an optical disk on which data is recorded, recorded data can be detected, and information is reproduced by demodulating the detected data.

In an optical recording / reproducing apparatus typified by a CD-R (Recordable) or the like, information is recorded on an optical disk by a short pulse light beam. The light beam used for recording is
The optical power and the irradiation time are controlled so that data can be optimally recorded on the optical disk. This control of the light beam is called a recording strategy. This recording strategy differs depending on the type of the optical disk, the recording linear velocity, the laser wavelength, and the like. Usually, each manufacturer stores a recording strategy capable of performing optimum recording under these conditions in a memory of a recording / reproducing apparatus for an optical disk before shipment.

On the other hand, on a CD-R disc, disc information such as a recommended recording power is recorded in the disc. In recording information, by reading disk information, a recording strategy suitable for each condition is selected. Therefore, the optical disk recording apparatus calls a recording strategy corresponding to the type of the optical disk, the recording linear velocity, and the like from a storage location such as a memory, and performs recording using a recording strategy suitable for each condition.

[0005]

However, in the prior art, recording is performed using a recording strategy determined in advance for optimizing the conditions for recording information on the optical disk. There has been a problem that the optimum recording conditions change due to variations between media, variations in the optical system, temperature changes, and the like, resulting in deterioration of recording.

As a method for responding to the change in the recording conditions, for example, as shown in "CD-R / RW": (p37-38: triceps), before recording information,
PC (Optimum Power Control)
Test writing called PCA (Power
The optimum recording level is obtained by varying the laser power in the calibration area. OP
C is recorded by changing the light emission power of the laser using the test data composed of a combination of marks and spaces with the nine types of data widths of 3T to 11T described above, and reproducing this test pattern to obtain each light emission power. The recording laser power is obtained in accordance with evaluation criteria such as the vertical symmetry and the signal amplitude of the reproduction waveform of the reproduction data, and the data recording is optimized by adjusting the recording power. However, in actual recording, environmental conditions are different from those obtained when a strategy is obtained, so that there is a problem that optimal data recording cannot be performed only by correcting the recording power.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems by determining not only an output level of a recording laser but also a recording strategy for obtaining optimum recording at every recording, and optimization of recording conditions. It is an object of the present invention to provide a recording technique for an optical disc capable of performing the recording.

[0008]

To achieve the above object, according to a first aspect of the present invention, a recording control method includes a step of recording data in a test writing area of an optical disk and a step of reproducing the recorded data. Measuring the data width of the reproduced signal, and generating a difference between the measured data width and a reference data width as an error signal; and recording the data to be recorded on the optical disk with the error signal. Controlling the time width of In the first invention, the step of recording the data includes recording random recording data as the data to be recorded, and the reproducing step includes a step of extracting a specific data pattern from the reproduced signal.

According to a second aspect of the present invention, an optical disc apparatus irradiates an optical disc with laser light and receives and detects reflected light from the optical disc, and reproduces the reproduced data from a detection signal output from the pickup. A data processing unit, and a recording signal compensating unit for controlling a laser output waveform of the pickup when information is recorded on the optical disc, wherein the reproduction data processing unit measures a data width of a reproduction signal recorded on the optical disc; A difference between the measured data width and a reference data width value is generated as an error signal and fed back to the recording signal compensating means to control the time width of the recording signal. In the second invention, a recording data generating means is provided,
When recording, the recording data is generated by generating specific data from the recording data generating means. A recording data generating means is provided, and when recording, recording is performed by generating random recording data from the recording data generating means, and the reproduction data processing means extracts a specific data pattern from the reproduction signal.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings using some examples. FIG. 1 is a block diagram showing a first embodiment of the optical disk device according to the present invention. In the figure, 1 is a recordable / reproducible optical disk, 2 is a pickup that irradiates a laser beam to the optical disk 1 to record information and receives and detects reflected light from the optical disk 1, 3 is a spindle motor that rotates the optical disk 1 Reference numeral 4 denotes a rotation control unit of the spindle motor 3, 5 denotes a reproduction data processing unit, 6 denotes a recording compensation output control unit, 7 denotes a recording data generation unit, and the recording compensation output control unit 6 outputs an error of 3T to 11T. Has a memory for recording.

The optical disk 1 is in close contact with a spindle motor 3 and is rotated by the rotation of the spindle motor 3. The spindle motor 3 is rotated according to a motor drive signal a supplied from the rotation control means 4. The pickup 2 receives the reflected light from the optical disk 1 and detects the detection signal b.
Is supplied to the reproduction data processing means 5. Here, the reproduction data processing means 5 detects the data recorded on the optical disc 1 from the detection signal b and reproduces the data.

Next, correction of a recording strategy which is a feature of the present invention will be described. First, before recording data, the recording pulse width of the recording strategy is adjusted in the test writing area of the optical disc 1. That is, random data is written in the test writing area of the optical disc 1 and reproduced. 3T ~
Since the width of 11T is determined, it is checked whether or not 3T to 11T of the reproduced data falls within the width of 3T to 11T determined by the standard. 6 and the recording compensation output control means 6 is controlled by the error.

First, a recording strategy corresponding to the disk type and the recording linear velocity is set in the recording compensation output control means 6, and the recording data generating means 7 supplies EFM-modulated recording data e. The recording data e supplies the pickup 2 with a laser drive control signal c corresponding to the recording strategy set by the recording compensation output control means 6. The pickup 2 irradiates a recording beam to the optical disc 1 by a laser drive control signal c to perform test writing. After the trial writing, the pickup 2 receives the reproduction light of the optical disk 1,
The detection signal b of the data recorded by trial writing is supplied to the reproduction data processing means 5.

Here, details of the reproduction data processing means 5 will be described with reference to FIG. FIG. 2 is a block diagram showing one embodiment of the reproduction data processing means. In the figure, 8
Denotes a reproduced data width detecting means, 9 denotes an error signal generating means, 10
Is an error signal conversion means. The detection signal b supplied from the pickup 2 is supplied to the reproduction data width detection means 8. The reproduction data width detection means 8 measures the data width from the detected reproduction signal and supplies the measurement result f to the error signal generation means 9. The error signal generating means 9 generates an error signal g for an excess or deficiency between the data width (reference value) defined in the optical disc standard and the measured reproduction data width f. The error signal g generates a correction signal d corresponding to the correction amount of the recording strategy in the error signal conversion means 10 and supplies it to the recording compensation output control means 6. Recording compensation output control means 6
Performs the time width correction of the recording waveform corresponding to the correction signal d to the strategy setting value used in the test writing operation, and changes the strategy setting. This correction signal is stored in the memory of the recording compensation output control means 6, and is used when actual data is recorded.

Hereinafter, a data waveform and a recording laser output waveform necessary to obtain a recording light emission pulse waveform after error correction will be described with reference to FIG. 3A and 3B are diagrams showing one embodiment of a time chart of a signal relating to recording control according to the present invention. FIG. 3A shows a channel clock, FIG. 3B shows recording EMF data, and FIG. Is the laser emission output,
FIG. 3D shows the reproduced data, FIG. 3E shows the error signal,
FIG. 3F shows the recording light emission pulse waveform after error correction. Recording EFM signal 3 synchronized with channel clock 31
2 is an optical pulse waveform 33 controlled by the recording strategy.
(Laser drive control signal c) is generated, and data is recorded on the optical disc 1. The reproduced data 34 (detection signal b) recorded thereby generates an error ΔT33 (error signal g) shown in FIG. The error signal 35 is corrected by the error signal conversion means 10 shown in FIG. 2 to obtain a correction amount such that the data width of the reproduced signal becomes a reference value, and a correction signal d is generated. Using this correction signal d, as shown in FIG. 3F, the recording light emission pulse waveform 3 obtained by correcting the time width of the recording strategy by ΔT33.
6 is obtained.

By performing recording using the recording light emission pulse waveform 36 shown in the figure, the reproduction data width becomes a reference value, and optimum recording can be realized. As described above, by obtaining the correction amount from the recording result of the test writing and optimizing the recording, the reliability of the recording data is increased, and stable recording with few recording errors can be performed. By applying this method to the apparatus, an optical disk recording / reproducing apparatus capable of providing highly reliable data recording can be realized. Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 4 is a block diagram showing a second embodiment of the optical disk device according to the present invention. 4, the same components as those in FIGS. 1 and 2 are denoted by the same reference numerals,
The description is omitted. In FIG. 4, reference numeral 11 denotes a reproduced data width comparing means for comparing the reproduced data width with the reference data width. As a recording signal used for test writing, a test pattern specifying a combination of data is generated by the recording data generating means 7, and the recording compensation output control means 6 picks up a laser drive control signal c corresponding to a strategy setting suitable for recording conditions. To supply. The pickup 2 irradiates a recording beam to the optical disc 1 by a laser drive control signal c to perform test writing.

Next, a strategy correction method which is a feature of the present invention will be described. After the end of the trial writing, the pickup 2 reproduces the trial writing data. The reproduction data width comparison means 11 compares the detection signal b with the recording data.
The reproduction data width comparison means 11 outputs the comparison result h, and the error signal generation means 9 generates an error signal g with the reference data width and supplies it to the error signal conversion means 10. The error signal conversion means 10 obtains a correction amount for the recording strategy so that the data width of the reproduction signal becomes a reference value, and supplies a correction signal d to the recording compensation output means 6 to correct the recording strategy. Here, the test data used for recording has a special relationship with the combination of data. The recorded data on the optical disk is
The data width differs even for the same data length due to interference between codes caused by heat distribution due to the combination of mark and space data. The mark data on the optical disk is formed by irradiating a light beam on the irradiation surface. At this time, the heat at the time of mark recording is diffused to a portion other than the irradiation surface, and a temperature distribution occurs on the recording surface. That is, when the mark is short, heat diffusion is small, and when the mark is long, the heat diffusion amount is large. Therefore, the length of the 3T changes depending on whether a long mark or a short mark comes before the same 3T. As described above, the data width of a recording mark formed is affected by the combination of data before and after recording. The test data used for recording is determined in consideration of these factors.

FIG. 5 is a diagram showing another embodiment of a time chart of signals relating to recording control according to the present invention.
5A shows a channel clock, and FIG. 5B shows a recorded EMF.
FIG. 5C shows the laser emission output, and FIG.
5E shows reproduced data, FIG. 5E shows an error signal, and FIG.
Represents the recording light emission pulse waveform after error correction. The figure shows a data waveform when the length of the mark of the recorded EFM data is changed and combined with the space data, and the channel clock 31 in FIG. 5A is the same as the channel clock in FIG. , The recorded EFM data 62 in FIG.
Mark is a combination of 3T and 5T. FIG.
The recording light beam emission waveform 63 in (c) is the same waveform as the recording EFM data. The reproduced data waveform 6 shown in FIG.
4 (error signal g) has Δ3T and Δ5T errors with respect to the recording light beam emission waveform 63. By comparing the recording light beam emission waveform 63 with the reproduction data waveform 64, FIG.
An error signal 65 (correction signal g) shown in (e) is obtained.
Using this error signal 65, a recording light emission pulse waveform 66 after error correction shown in FIG. The errors ΔT33 and ΔT53 shown in FIG. 5E are errors with respect to the data length indicating the same 3T, but differ depending on the data combination. If a test pattern that can individually correct these errors is used, the recording accuracy of the entire data increases. Therefore, if the test data used for test writing is a combination of data that can perform effective correction, the recording reliability is improved, and stable data recording can be performed. Also,
When reproducing an optical disc recorded by CLV by CAV, the correction signal is adjusted by using the coefficient recorded in the memory of the recording compensation output control means 6.

Next, a third embodiment of the present invention will be described with reference to FIG. FIG. 6 is a block diagram showing a third embodiment of the optical disk device according to the present invention. In FIG.
The same reference numerals are given to the same blocks as in FIG. 4, and the description thereof will be omitted. In FIG. 6, reference numeral 12 denotes a data pattern selection and extraction means for selecting a necessary data pattern from reproduced data obtained by reproducing data recorded in the test writing area and extracting the data pattern from a data string. As a recording signal used for test writing, a random test pattern is generated by the recording data generating means 7. The recording compensation output control means 6 supplies the pickup 2 with a laser drive control signal c corresponding to a recording condition, for example, a strategy setting suitable for a disc type and a recording speed. The pickup 2 irradiates a recording beam to the optical disc 1 by a laser drive control signal c to perform test writing. After the end of the trial writing, the pickup 2 reproduces the trial writing data, and generates the reproduction data i by extracting the reproduction data corresponding to the specific data pattern in the data pattern selection / extraction means 12 from the detection signal b. The reproduction data i is supplied to the reproduction data width comparison means 11 and the data width is compared with the recording data to generate a comparison result h. The comparison result h is supplied to the error signal generation means 8, generates an error signal g with the reference data width, and is supplied to the error signal conversion means 9. A correction amount for the recording strategy is obtained by the error signal conversion means 9 so that the data width of the reproduction signal becomes a reference value, and a correction signal d is supplied to the recording compensation output means 6 to correct the recording strategy.

Here, random data is used for trial writing recording. As described above, even if the recording data of the optical disc has the same data length due to the interference between codes, the error differs depending on the data combination. The reproduction data used for the strategy correction amount is extracted so as to be a data pattern capable of correcting different errors, and an error signal is generated, whereby the strategy correction amount can be obtained. If recording is performed using the corrected strategy, the data width approaches the reference value, and the recording is optimized. Therefore, if the data pattern extracted from the reproduction data is a combination of data that can perform an effective correction, the recording reliability is improved and stable data recording can be performed. By applying these techniques to an optical disk device, an optical disk recording / reproducing device capable of providing highly reliable data recording can be realized. Further, an error up to the recording area, which is an error correction signal obtained by performing test writing in the test writing area, is corrected,
After that, the recorded data is reproduced temporarily in the middle of the recording operation, and if the strategy is corrected by using the reproduced value of the data, the correction during the recording is performed. Alternatively, it is possible to correct for variations such as variations in the recording surface in the same optical disk, and to provide highly reliable recording.

As described above, in the first embodiment of the present invention, data having a specified data width is recorded by correcting the time width of a recording pulse in test writing before information recording. Stable information recording can be realized by finding the optimum recording conditions that change depending on the type of the medium of the optical disc, the recording linear velocity, the temperature at the time of recording, and the like for each recording. In addition, by applying this technique to an optical disc device, an optimum recording condition is corrected for each recording, and a device with stable recording and few recording errors can be realized. In the second embodiment, in the test writing before the information recording, the correction affecting the formation of the recording data can be specially performed by the specific pattern, so that the recording condition is optimized and the stable information recording can be realized. it can. Also,
By applying this technique to an optical disc device, the optimum recording conditions are corrected for each recording, and a device with stable recording and few recording errors can be realized. Further, in the third embodiment, the test conditions before information recording are randomized, and a data pattern affecting the formation of the recorded data is extracted at the time of reproduction and corrected, so that the recording conditions are optimized. Stable information recording can be realized.
In addition, by applying this technique to an optical disc device, an optimum recording condition is corrected for each recording, and a device with stable recording and few recording errors can be realized. In addition to the test writing, for example, data is reproduced during the recording operation, and if the strategy is corrected using this, the correction during recording is performed. Correction can be performed, and highly reliable recording can be provided.

[0022]

As described above, according to the present invention, stable information recording can be realized.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a first embodiment of an optical disk device according to the present invention.

FIG. 2 is a block diagram showing one embodiment of a reproduction data processing means.

FIG. 3 is a diagram showing one embodiment of a time chart of signals related to recording control according to the present invention.

FIG. 4 is a block diagram showing a second embodiment of the optical disk device according to the present invention.

FIG. 5 is a diagram showing another embodiment of a time chart of a signal relating to recording control according to the present invention.

FIG. 6 is a block diagram showing a third embodiment of the optical disk device according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Optical disk, 2 ... Pickup, 3 ... Spindle motor, 4 ... Rotation control means, 5 ... Reproduction data processing means, 6
... Recording compensation output control means, 7 ... Record data generating means, 8
... Reproduction data width detection means, 9 ... Error signal generation means, 10
... Error signal conversion means, 11 ... Reproduction data width comparison means, 1
1. Data pattern selection and extraction means.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Naomi Nomura 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture F-term in the Digital Media System Division of Hitachi, Ltd. 5D090 AA01 BB04 CC01 DD03 DD05 EE02 GG33 JJ12 KK04 KK05 5D119 AA23 BA01 BB03 DA01 HA19 HA60

Claims (5)

[Claims] 1. A method for recording data on a test writing area of an optical disk for recording information on an optical disk capable of recording and reproduction, a step of reproducing the recorded data, and a step of reproducing the reproduced signal. Measuring a data width, generating a difference between the measured data width and a reference data width as an error signal, and controlling a time width of the data to be recorded on the optical disc by the error signal. A recording control method comprising: 2. The recording control method according to claim 1, wherein the step of recording the data includes recording random recording data as the data to be recorded, and the reproducing step includes a step of recording a specific data pattern from the reproduced signal. A recording control method comprising the step of extracting 3. A pickup for irradiating an optical disc with laser light and receiving and detecting reflected light from the optical disc, reproduction data processing means for processing reproduction data from a detection signal output from the pickup, and information on the optical disc. Recording signal compensating means for controlling the laser output waveform of the pickup when recording the data. The reproduction data processing means measures the data width of the reproduction signal recorded on the optical disk, and the measured data width is used as a reference. An optical disc device, wherein a difference from a data width value is generated as an error signal and fed back to the recording signal compensating means to control a time width of the recording signal. 4. The optical disk device according to claim 3, wherein
An optical disc device comprising a recording data generating means, and when recording, performing recording by generating specific data from the recording data generating means. 5. An optical disk apparatus according to claim 3, further comprising: a recording data generating means, wherein when recording, the recording data is generated by generating random recording data from said recording data generating means. An optical disc device for extracting a specific data pattern from a reproduced signal.