JP2002092880A - Optical disk recording / reproducing apparatus and optical disk recording / reproducing method - Google Patents

Abstract

(57) [Problem] To provide an optical disc recording / reproducing apparatus and a recording / reproducing method for performing a learning process for optimizing each parameter such as a recording power according to a loaded optical disc. An optical disk recording / reproducing apparatus for recording data in a predetermined area of an optical disk in response to a laser beam emitted from an optical head, comprising at least a power value of a default value and a plurality of values different from the power value in a stepwise manner. Based on the power value, data is written to and read from a predetermined area of a new optical disc loaded, the number of error lines is determined, and the power value is determined accordingly (S
6). Next, write / read processing is further performed from the power value to obtain three types of bit error rates, and the power value is finely adjusted based on the bit error rates (S7). As a result, a power value that is very suitable for the optical disc can be obtained by learning.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a DVD-RAM.
TECHNICAL FIELD The present invention relates to an optical disk recording / reproducing apparatus and a recording / reproducing method for recording data on an optical disk such as an optical disk and reproducing the recorded data, and particularly relates to processing such as power learning of the apparatus.

[0002]

2. Description of the Related Art Recently, an optical disk recording / reproducing apparatus for recording data on an optical disk such as a DVD-RAM and reproducing the recorded data has been put into practical use and spread.

[0003] Such an optical disk (DVD-RAM)
Has a large storage capacity (2.6 GB, 4.7 GB), and has been used as an external storage means such as a personal computer (PC).

In the above optical disk (DVD-RAM),
The actual data is recorded on the groove or land by a laser beam from the optical head as a mark row due to a phase change.

[0005] At this time, the loaded optical disks do not always have the same recording characteristics but have variations. Therefore, in order to obtain recording characteristics of a certain level or more, it is desirable to optimize each parameter for recording according to each optical disc when recording data. Specifically, the recording power and erasing power of the optical head, the focus offset and tracking offset of the laser beam, and also the values of the recording compensation pattern table, the default value given first is not necessarily the optimal value. I can not say. Therefore, in order to obtain optimum recording characteristics, it is necessary to perform a process of optimizing these various parameter values in order to correct the deflection of a given optical disk.

[0006]

However, parameters for recording, that is, optimization processing of optical head power (recording power, erasing power), focus offset, tracking offset, recording compensation pattern table, etc., are conventionally performed. However, there is a problem that this is not always performed in the optical disk recording / reproducing apparatus.

According to the present invention, in order to cope with such a problem, when an optical disk for recording is loaded and a recording command is issued, a learning process is automatically performed to optimize each parameter for recording according to the optical disk. It is an object of the present invention to provide an optical disc recording / reproducing apparatus for performing the above.

[0008]

According to the present invention, there is provided an optical disk recording / reproducing apparatus for recording data in a predetermined area of an optical disk in response to a laser beam emitted from an optical head. Upon receiving a data recording command, a setting unit that sets a power value of a laser beam emitted from the optical head and each parameter value of a recording compensation table used for a data recording process to default values, and a setting unit. Based on the set recording compensation table, write the data to a predetermined area of the loaded new optical disc corresponding to the power value of the default value and a plurality of power values having values different from the default value stepwise. 1 writing means and the data written by the first writing means are read, and the number of error lines of the read data is determined. A first measuring means for measuring each of them, a first determining means for determining a power value according to the number of error lines measured by the first measuring means, and a power value determined by the first determining means, Based on the power value that is larger by a predetermined amount and the power value that is smaller by a predetermined amount,
A second writing unit that writes data to a predetermined area of the optical disc; a second measurement unit that reads data written by the second writing unit and measures a bit error rate of the read data; (2) a second determining means for determining a final power value based on the bit error rate measured by the measuring means; and a laser beam being emitted from the optical head based on the power value determined by the second determining means. And a recording / reproducing means for recording given data on a predetermined area of the optical disk and reproducing the data.

The present invention specifies a plurality of stages of power learning, and provides an optical disk recording / reproducing apparatus for learning a more precise power value suitable for an optical disk which is not provided in the conventional apparatus.

The present invention also provides an optical disk recording / reproducing apparatus for recording data in a predetermined area of an optical disk in response to a laser beam radiated from the optical head. Setting means for setting default values of the power value of the laser beam emitted from the optical disc and the respective parameter values of the recording compensation table used for the data recording process, and setting the focus offset of the laser beam of the optical head to a default value, A plurality of focus offset values having different values are provided in a stepwise manner, and based on these focus offsets, the power value set by the setting means, and the recording compensation table, a predetermined area of the loaded new optical disc is set. Writing means for writing data to the Measuring means for reading data and measuring the bit error rate of the read data, determining means for determining an optimum focus offset value in accordance with the bit error rate measured by the measuring means, and determining means for determining An optical disc recording / reproducing apparatus comprising: a recording / reproducing means for recording given data by reproducing a laser beam from an optical head based on a focus offset value in a predetermined area of the optical disc and reproducing the same. is there.

The present invention specifies an optical disk recording / reproducing apparatus for learning an optimum value for a focus offset suitable for an optical disk.

According to the present invention, there is provided an optical disk recording / reproducing apparatus for recording data on a predetermined area of an optical disk in response to a laser beam emitted from the optical head. Setting means for setting the power value of the laser beam emitted from and the parameter values of the recording compensation table used for data recording processing to default values, respectively, and the laser beam tracking offset of the optical head as a default value, A plurality of tracking offset values having different values are provided in a stepwise manner, and based on these tracking offsets, the power value set by the setting means, and the recording compensation table, a predetermined area of the loaded new optical disc is set. Writing means for writing data to the Measuring means for reading out the read data and measuring the bit error rate of the read data, determining means for determining an optimum tracking offset value in accordance with the bit error rate measured by the measuring means; and Recording and reproducing means for recording and reproducing the given data in a predetermined area of the optical disk by radiating a laser beam from the optical head based on the determined tracking offset value; Device.

The present invention specifies an optical disk recording / reproducing apparatus that learns an optimum value for a tracking offset suitable for an optical disk.

According to another aspect of the present invention, in an optical disk recording / reproducing apparatus for recording data in a predetermined area of an optical disk in response to a laser beam emitted from the optical head, when an instruction to record data on the optical disk is received, Setting means for setting the power value of the irradiated laser beam, focus offset, tracking offset, and each parameter value of a recording compensation table used for data recording processing to default values, and each default value set by the setting means A first writing unit for writing data to a predetermined area of a new optical disc loaded therein, a first measurement unit for reading data written by the writing unit, and measuring a shift amount of the data; Each parameter of the compensation table according to the shift amount measured by the measuring means Correction means for correcting the error, a second writing means for writing data to a predetermined area of a new optical disc loaded based on each parameter value of the compensation table corrected by the correction means, and a second writing means A second measuring means for reading out the written data and measuring these shift amounts, and finally determining each parameter value of the recording compensation table based on the measurement results of the first and second measuring means. A laser beam is emitted from an optical head according to given data based on each parameter value of the compensation table determined by the determining unit, and the data is recorded in a predetermined area of the optical disc and reproduced. An optical disk recording / reproducing apparatus, comprising:

According to the present invention, an optical disk recording / reproducing apparatus for learning an optimum value suitable for an optical disk for a recording compensation table is specified.

According to another aspect of the present invention, in an optical disk recording / reproducing apparatus for recording data in a predetermined area of an optical disk in response to a laser beam emitted from the optical head, when a command for recording data on the optical disk is received, Setting means for setting the power value of the irradiated laser beam and each parameter value of a recording compensation table used for data recording processing to default values, respectively, based on the power value and the recording compensation table set by the setting means. A temporary power determining means for writing data to a predetermined area of the loaded new optical disc, reading the data, obtaining the number of error lines, and determining a temporary power value based on the error lines; the setting means; and the temporary power determining means. Based on the provisional power value and each parameter value of the recording compensation table. Data is written to and read from a predetermined area, a bit error rate is obtained, a focus offset determining means for determining an optimum focus offset value based on the bit error rate, and provisional power by the setting means and the provisional power determining means. Tracking offset determining means for writing and reading data in a predetermined area of the optical disk based on the value and each parameter value of the recording compensation table, obtaining a bit error rate, and determining an optimum tracking offset value based on the bit error rate; On the basis of the provisional power value by the setting unit and the provisional power determination unit and each parameter value of the recording compensation table, data is written to and read from a predetermined area of the optical disc, and a bit error rate is obtained. Each parameter of the optimal recording compensation table Table determining means for determining data values, and performing write processing and read processing on a predetermined area of the optical disc based on the values determined by the focus offset determining means, the tracking offset determining means, the table determining means, and the table determining means. And based on the number of error lines obtained,
A final power determining means for determining a final power value, and performing a writing process and a reading process on a predetermined area of the optical disc in accordance with the final power value determined by the final power determining device, Fine adjustment means for finely adjusting the final power value based on the
Based on the determination results of the focus offset determination unit, the tracking offset determination unit, the table determination unit, and the fine adjustment unit, given data is emitted to a predetermined area of the optical disk by emitting a laser beam from the optical head. An optical disk recording / reproducing apparatus comprising: a recording / reproducing means for recording on and reproducing the information from the optical disk.

The present invention specifies an optical disk recording / reproducing apparatus that performs focus offset learning, tracking offset learning, and recording compensation table learning in addition to power learning in a plurality of stages. There is no conventional apparatus suitable for variations in optical disks. It is possible to provide an optical disk recording / reproducing apparatus capable of obtaining high recording characteristics.

The present invention further provides an optical disk recording / reproducing apparatus for recording data in a predetermined area of an optical disk in response to a laser beam emitted from the optical head, wherein the optical head receives a data recording instruction on the optical disk. A setting step of setting each parameter value of the recording compensation table used for the power value of the laser beam irradiated from the data and the recording processing of the data to a default value, based on the recording compensation table set in the setting step, A first writing step of writing data to a predetermined area of a newly loaded optical disk in accordance with a default power value and a plurality of power values having values that are stepwise different from the default power value; A first step of reading the data written in the process and measuring the number of error lines of the read data, respectively;
A measuring step, a first determining step of determining a power value according to the number of error lines measured in the first measuring step, and a power value determined in the first determining step, at least
A second writing step of writing data in a predetermined area of the optical disk based on a power value larger by a predetermined amount and a power value smaller by a predetermined amount; and data written in the second writing step. A second measurement step of reading a bit error rate of read data, a second determination step of determining a final power value based on the bit error rate measured in the second measurement step, A recording / reproducing step of recording and reproducing the given data in a predetermined area of the optical disk by emitting a laser beam from the optical head based on the power value determined in the second determining step. And an optical disc recording / reproducing method.

According to the present invention, in an optical disk recording / reproducing apparatus for recording data in a predetermined area of an optical disk in response to a laser beam radiated from the optical head, when an instruction to record data on the optical disk is received, A setting step of setting the power value of the laser beam to be irradiated and each parameter value of the recording compensation table used for data recording processing to default values, respectively, and setting a focus offset of the laser beam of the optical head to a default value, A plurality of focus offset values having different values are provided in a stepwise manner, and based on these focus offsets, the power value set in the setting step, and the recording compensation table, a predetermined area of a new optical disc loaded is set. A writing step of writing data to the Reading the data, a measuring step of measuring the bit error rate of the read data, a determining step of determining an optimal focus offset value according to the bit error rate measured in the measuring step, A recording / reproducing step of recording and reproducing the given data in a predetermined area of the optical disk by radiating a laser beam from the optical head based on the determined focus offset value. Is the way.

According to the present invention, in an optical disk recording / reproducing apparatus for recording data in a predetermined area of an optical disk in response to a laser beam radiated from the optical head, when an instruction to record data on the optical disk is received, A setting step of setting the power value of the irradiated laser beam and each parameter value of a recording compensation table used for data recording processing to default values, respectively, and a tracking offset of the laser beam of the optical head as a default value, A plurality of tracking offset values having different values are provided in a stepwise manner, and based on these tracking offsets, the power value set in the setting step, and the recording compensation table, a predetermined area of the loaded new optical disc is set. A writing step of writing data to the Measuring the read data and measuring a bit error rate of the read data, a determining step of determining an optimum tracking offset value according to the bit error rate measured in the measuring step, and the determining step. A recording / reproducing step of recording and reproducing the given data in a predetermined area of the optical disk by radiating a laser beam from the optical head based on the tracking offset value determined in the step (a). This is a recording / reproducing method.

According to the present invention, there is provided an optical disk recording / reproducing apparatus for recording data in a predetermined area of an optical disk in response to a laser beam radiated from the optical head. A setting step of setting each parameter value of a laser beam power value, a focus offset, a tracking offset, and a recording compensation table used for data recording processing to default values, and a default value set in the setting step. A first writing step of writing data to a predetermined area of a new optical disc loaded, and reading the data written in the writing step;
A first measurement step of measuring these shift amounts, a correction step of correcting each parameter value of the compensation table according to the shift amount measured in the measurement step, and the compensation table corrected in the correction step Based on the respective parameter values, a second writing step of writing data to a predetermined area of the loaded new optical disk, reading the data written in the second writing step, and measuring the shift amounts of these. A second measurement step, a determination step of determining each parameter value of a final recording compensation table based on at least the measurement results in the first and second measurement steps, and the compensation table determined in the determination step A laser beam is emitted from an optical head according to given data based on each parameter value of, and data is recorded in a predetermined area of an optical disk and reproduced. An optical disk recording and reproducing method characterized by comprising the recording reproduction process.

According to the present invention, there is provided an optical disk recording / reproducing apparatus for recording data in a predetermined area of an optical disk in accordance with a laser beam emitted from the optical head. A setting step of setting the power value of the laser beam to be performed and each parameter value of a recording compensation table used for data recording processing to default values, respectively, based on the power value and the recording compensation table set in the setting step. Writing data into a predetermined area of the loaded new optical disc, reading the data, obtaining the number of error lines, and determining a provisional power value based on the number of error lines; the setting step and the provisional power determining step Based on the provisional power value and each parameter value of the recording compensation table. Data is written to and read from a predetermined area, a bit error rate is obtained, a focus offset determining step of determining an optimum focus offset value based on the bit error rate, and a provisional power by the setting step and the provisional power determining step. A tracking offset determining step of writing and reading data in a predetermined area of the optical disk based on the values and the respective parameter values of the recording compensation table, obtaining a bit error rate, and determining an optimum tracking offset value based on the bit error rate. On the basis of the provisional power value obtained by the setting step and the provisional power determination step and each parameter value of the recording compensation table, data is written to and read from a predetermined area of the optical disc, and a bit error rate is obtained. Each parameter of the optimal recording compensation table A table determining step of determining a data value, and a write process and a read process for a predetermined area of the optical disc based on the values determined in the focus offset determining step, the tracking offset determining step table determining step, and the table determining step. And based on the obtained number of error lines,
A final power determining step of determining a final power value, and performing a writing process and a reading process on a predetermined area of the optical disc in accordance with the final power value determined in the final power determining step. Based on the rate, a fine adjustment step of finely adjusting the final power value, and a focus offset determination step, a tracking offset determination step, the table determination step, based on the respective determination results in the fine adjustment step And a recording / reproducing step of recording and reproducing the given data in a predetermined area of the optical disk by radiating a laser beam from the optical head.

In the above-described optical disk recording / reproducing method, similarly to the optical disk recording / reproducing apparatus, in addition to power learning at a plurality of stages, focus offset learning, tracking offset learning, and recording compensation table learning are performed. It is possible to provide an optical disk recording / reproducing method capable of obtaining high recording characteristics not available in the conventional device.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an optical disk recording / reproducing apparatus according to an embodiment of the present invention will be described with reference to the drawings.

<Structure of Optical Disk Recording / Reproducing Apparatus> FIG. 1 is a flowchart showing a learning sequence according to an embodiment of the present invention, and FIG. 2 is a diagram showing a schematic configuration of an optical disk recording / reproducing apparatus according to an embodiment of the present invention. is there.

In FIG. 1, upon receiving a recording command, the optical disk recording / reproducing apparatus according to the present invention performs three power learning (provisional power learning, final power learning, and power fine adjustment learning) on the loaded optical disk. This shows that focus offset learning, tracking offset learning, and table learning are performed.

The optical disk recording / reproducing apparatus 30 shown in FIG. 2 is for recording data on the optical disk (DVD-RAM) 1 and reproducing data from the optical disk 1.

The optical disk 1 is formed by coating a metal film layer in a donut shape on a surface of a substrate formed in a circle of, for example, glass or plastics.
Data recording (recording with phase change marks) or reproduction of recorded data is performed using both concentric or spiral grooves and lands, and address data is recorded at predetermined intervals by recording pits in a mastering process. It is a phase change type and rewritable disk.

The optical disk 1 has grooves and lands tracks for recording spiral or concentric data, and includes a header (not shown) composed of grooves and lands of a fixed length and composed of address data and data. It has a plurality of sectors including a recording area (not shown), and includes a plurality of zones for each of the plurality of tracks.

As the optical disk 1, there are several types of disks, and the power at the time of recording a laser beam, which will be described later, that is, the recording peak power and the erasing power 1 are different for each disk type. For example, the characteristics of the optical disc 1 are different for each manufacturer.

In the control data zone in the emboss data zone of the lead-in area of the optical disc 1,
As data indicating the disc type (characteristics of the optical disc 1), a recording peak power is recorded, an erasing power 1 is recorded, or a company name is recorded.

As an example of the peak power, 10 m
W, 11 mW, 12 mW, and 13 mW. An example of the erasing power 1 is 4.5 mW, 5.0 mW, and 5.0 mW.
There are 5 mW and 6.0 mW.

When the optical disc 1 is loaded into the optical disc recording / reproducing apparatus 30, the optical disc 1 is recorded in the control data zone in the emboss data zone of the lead-in area of the optical disc 1 by using the optical head 3 and the data processing unit 6 described later. The recording peak power and the erasing power 1 as the characteristics of the optical disc 1 are read, and C
It is supplied to the PU 25.

The optical disk recording / reproducing apparatus 30 records data on the optical disk 1 while rotating the optical disk 1 at a different rotation speed for each zone,
The data recorded on the optical disk 1 is reproduced.

This optical disk recording / reproducing device 30 is a digital video recorder.
It is configured as a device that can read data not only from a D-RAM but also from other DVD disks and can write data to a rewritable DVD disk.

The optical disk recording / reproducing apparatus 30 includes an optical pickup (optical head) 2. This optical pickup 2 has an objective lens 3. In the optical pickup 2, a semiconductor laser unit (not shown) is provided corresponding to the objective lens 3, and a laser control unit 5 is provided.
To generate a laser beam of a corresponding wavelength. When the semiconductor laser unit is energized, a laser beam corresponding to the optical disk 1 is directed to the corresponding objective lens 3 and is converged on the optical disk 1 by the objective lens 3. The converged laser beam is used for the optical disc 1
(Generation of a mark sequence: data is recorded on the optical disk 1 according to the interval between marks of variable length and the length of each mark of variable length) or is reproduced.

The setting of the laser control unit 5 is set by the data processing unit 6, and the setting differs depending on the reproducing power for obtaining a reproduced signal, the recording power for recording data, and the erasing power for erasing data. . The laser beam has three different levels of power, reproduction power, recording power, and erasing power, and the semiconductor laser unit is energized by the laser control unit 5 so as to generate a laser beam of each power. You.

For example, the laser control unit 5 includes a resistor and a transistor (not shown), and a power supply voltage is applied to the resistor, the transistor, and a semiconductor laser as a semiconductor laser unit. As a result, the amplification factor varies depending on the base current of the transistor,
Different currents flow through the semiconductor laser oscillator, and laser beams with different intensities are generated. That is, a laser power corresponding to the signal level of the recording waveform from the recording waveform generation circuit 45 described later is generated.

The optical disk 1 is conveyed into the apparatus by the tray 7 directly or housed in the disk cartridge 1a so that the optical disk 1 is arranged to face the objective lens 3. A tray motor 8 for driving the tray 7 is provided in the apparatus. The loaded optical disc 1 is rotatably held on a spindle motor 10 by a clamper 9 and rotated by the spindle motor 10.

The optical pickup 2 has a photodetector (not shown) for detecting a laser beam therein. This photodetector detects a laser beam reflected by the optical disk 1 and returned via the objective lens 3. The detection signal (current signal) from the photodetector is a current / voltage converter (I
/ V) 12 to be converted into a voltage signal, and this signal is supplied to a preamplifier (RF amplifier) 13 and a servo amplifier 14. The preamplifier 13 outputs a signal for reproducing data in the header portion and a signal for reproducing data in the recording area to the DVD data processing unit 6. Servo signal (track error signal, focus error signal) from servo amplifier 14
Is output to the servo seek control unit 15.

As a method for optically detecting the amount of defocus, there is, for example, the following method.

[Astigmatism Method] An optical element (not shown) for generating astigmatism is arranged on a detection optical path of a laser beam reflected by a light reflection film or a light reflection recording film of the optical disk 1, and light is detected. This is a method for detecting a change in the shape of laser light applied to the vessel. The light detection area is divided into four diagonally. For the detection signal obtained from each detection area, DVD
The difference between the diagonal sums is obtained in the servo seek control unit 15 to obtain a focus error detection signal (focus signal).

[Knife Edge Method] This is a method of arranging a knife edge that asymmetrically shields a part of the laser light reflected by the optical disk 1. The light detection area is divided into two parts, and a difference between detection signals obtained from each detection area is obtained to obtain a focus error detection signal.

Usually, either the astigmatism method or the knife edge method is employed.

The optical disc 1 has spiral or concentric tracks, and information is recorded on the tracks.
Information is reproduced or recorded / erased by tracing the converged spot along this track. In order to stably trace the focused spot along the track, it is necessary to optically detect the relative displacement between the track and the focused spot.

The following method is generally used as a track shift detecting method. [Phase difference detection (Differential
Phase Detection) Method] A change in the intensity distribution of the laser light reflected by the light reflection film or the light reflection recording film of the optical disc 1 on the photodetector is detected. The light detection area is 4 on the diagonal line.
Has been split. The DVD servo seek control unit 15 calculates the phase difference between the diagonal sums of the detection signals obtained from the respective detection areas to obtain a track error detection signal (tracking signal).

[Push-Pull Method] A change in the intensity distribution of the laser light reflected by the optical disk 1 on the photodetector is detected. The light detection area is divided into two parts, and a track error detection signal is obtained by taking the difference between the detection signals obtained from each detection area.

[Twin-Spot Method] A diffractive element or the like is arranged in the light transmission system between the semiconductor laser element and the optical disk 1 to split the light into a plurality of wavefronts and to irradiate the optical disk 1 with ± first-order diffracted light. The change in reflected light amount is detected. A light detection area for individually detecting the reflected light amount of the + 1st-order diffracted light and the reflected light amount of the -1st-order diffracted light is arranged separately from the light detection area for detecting the reproduction signal. Get.

In the DVD mode, a focus signal, a tracking signal and a feed signal are sent from the DVD servo seek control unit 15 to the focus and tracking actuator driver and the feed motor driver 17,
The focus servo control and the tracking servo control of the objective lens 3 are performed by the driver 17.

Further, the driver 17 responds to the access signal.
Is supplied to the feed motor 11 to control the conveyance of the optical pickup 2.

The servo seek control unit 15 is controlled by the data processing unit 6. For example, an access signal is supplied from the data processing unit 6 to the servo seek control unit 15 to generate a feed signal.

The spindle motor driver 18 and the tray motor driver 19 are controlled by a control signal from the data processing unit 6, the spindle motor 10 and the tray motor 8 are energized, and the spindle motor 10 is rotated at a predetermined speed. The tray motor 8 controls the tray appropriately.

The reproduced signal corresponding to the data in the header supplied to the data processing unit 6 is sent to a CPU 25 described later.
Supplied to Accordingly, the CPU 25 determines the sector number as the address of the header part based on the reproduced signal, and compares it with the sector number as the address to access (record data or reproduce recorded data). It has become.

As for the reproduction signal corresponding to the data in the recording area supplied to the data processing unit 6, necessary data is stored in the RAM 20, and the reproduction signal is processed by the data processing unit 6 and has an interface having a RAM 21 as a buffer. The reproduction processing signal is supplied to the control unit 22 and supplied to an external device such as a personal computer, for example.

Each unit shown in FIG. 2 is controlled by the CPU 25 in accordance with the procedure stored in the ROM 24. RA
M26 is used as a memory of the CPU 25.

The ROM 24 has a recording compensation table 2
4a ((a) and (b) of FIG. 9) is registered in advance.

For example, as shown in FIG. 9A, the recording compensation table 24a has a mark length (3T, 4T, 5T).
T, the recording signal (modulated signal, NRZ) based on the length of the preceding (eg, leading) space relative to 6T or more.
This is the time (TSFP) from the rising of the I signal (I signal) to the rising position of the first pulse of the recording waveform, and is changed according to the modulation signal. This time is on the order of nsec.

The recording compensation table 24a has a mark length (3T, 4T, 5T, 6T) as shown in FIG.
T) is the time (TELP) from the timing at which the multi-pulse before the rising position of the last pulse is output to the falling position of the last pulse, based on the length of the space after (eg, trailing) relative to T or more. It is changed according to the modulation signal. This time is on the order of nsec.

The recording compensation table 24a, and FIGS. 9 (a) and 9 (b) are registered with different times. A different recording compensation table 24a is used for each combination based on the characteristics of the optical disc 1, the tilt amount of the optical disc 1, the recording radius position on the optical disc 1, and the peripheral temperature of the optical pickup 2.

The CPU 25 registers the recording peak power and the erasing power 1 as characteristics of the optical disk 1 read by the optical pickup 2 and the data processing unit 6 in the RAM 26 when the optical disk 1 is loaded. Has become.

<Learning Sequence of the Present Invention> In the optical disk recording / reproducing apparatus 30 having such a configuration, the CPU 25
The power learning, the focus offset learning, the tracking offset learning, and the recording compensation table learning are performed according to the program stored in the RAM 24 or the ROM 26 as described below. Hereinafter, this will be described in detail with reference to the drawings. FIG. 3 is a flowchart showing the provisional power learning of the learning sequence according to the embodiment of the present invention in detail, FIG. 4 is a flowchart showing the table learning of the learning sequence in detail, and FIG. It is a flowchart shown in FIG.

The optical disk recording / reproducing device 30 of the present invention comprises:
When performing a recording operation on an optical disk, a learning process is performed on a power value, a focus offset, a tracking offset, a recording compensation table, and the like before performing the recording process according to a variation in characteristics of each of the loaded optical disks. Do. In the flowchart of FIG. 1, when a write operation to the optical disk is instructed from an operation of an operator or the like, C
In the control of the PU 25, as an example, the recording peak power and the erasing power 1 are output from the control data zone in the emboss data zone of the lead-in area of the optical disk stored in the tray 7 as data indicating the disk type (characteristics of the optical disk 1). , Read company name, etc. Under the control of the CPU 25, the power value and the table value are set to the default values P ₀ and T ₀ based on the read values and the values prepared in advance in the ROM 24 or the like in the optical disk recording / reproducing apparatus. Data is stored in RAM 26
(S1).

Next, provisional power learning is performed on the recording power and the erasing power (S2). Specifically, CP
Under the control of U25, the draft is performed five times, recorded in 8 ECC blocks, and the central 4 ECC blocks are reproduced.
Provisional power learning is performed based on the set default value, and a provisional power value P _temp is obtained (S3).

The provisional power learning is shown in the flowchart of FIG.
An example of the processing will be described in detail according to the following.
Power, erase power, start value P₀-4H
(H is one of the units of the amount of change).
While adding 1H at a time,
Is written (S11). When writing is completed,
The written data is read (S12). Read data
Parameters for different power values.
-The number of lines is measured in order (S13). And Ella
-Power value at which the absolute value of the number of lines becomes 80H or less for the first time
P_thtempAnd the number of error lines and the previous
The difference between the power value and the number of error lines is 80H or more.
It is determined whether or not there is (S14). Figure 6 shows the error
It is a graph which shows the change of an in number, (a) is 80H or more.
When there is a difference, (b) is less than 80H.
If there is a difference of 80H or more in (a), the provisional power value P
_tempTo P _thtemp+ 02H (S15). 8 of (b)
If less than 0H, the provisional power value P_tempTo P_thtemp+0
1H (S16).

Next, returning to the flowchart of FIG. 1, the focus offset learning will be described. Focus offset learning is performed based on the provisional power value P _temp obtained in step S3 (S3). That is, in addition to the default value, a focus offset value of default value + 03H and default -03H is prepared, and according to these, writing is performed in a predetermined area of the optical disk, and these are read out.
This is for obtaining a bit error rate. Then, the focus offset value having the best bit error rate is used as the final focus offset.

The graph of FIG. 9A shows this state. In this case, since the default value has the best bit error rate, it can be seen that the default value is the focus offset value.

Next, tracking offset learning will be described. Tracking offset learning is performed based on the provisional power value P _temp obtained in step S3 (S4).
In this case, similarly to the case of the focus offset value, in addition to the default value, a tracking offset value of a default value + 03H and a default -03H are prepared, and according to these, a predetermined area of the optical disk is written and read. , And a bit error rate. Then, the tracking offset value having the best bit error rate is used as the final tracking offset.

[0068] Referring now the table learning be described, based on the provisional power P _{te mp} obtained in step S2, by performing a table learning recording compensation pattern table, as appropriate depending on the shift amount, the value of the recording compensation pattern table It is improved (S5).

More specifically, referring to the flowchart of FIG. 4, random data is written to a predetermined area of the optical disk (S21), read out, and the shift amount of each edge is measured (S22). Here, FIG. 7 is an explanatory diagram for explaining the processing operation of table learning, and FIG. 8 is a diagram showing an example of table values to be subjected to table learning. 7, the shift amount of the edge A when the previous space length is 4T and the mark length is 5T corresponds to the shift amount indicated by the data A of the recording compensation pattern table shown in FIG.
Similarly, in FIG. 7, the shift amount of the edge B when the rear space length is 5T and the mark length is 5T corresponds to the shift amount indicated by the data B of the recording compensation pattern table shown in FIG. 8B. . The shift amount of each edge is 80H
When the shift amount exceeds ± 10H (S23), for example, up to three times (S24), the recording compensation pattern table at the position where the shift amount exceeds 80H ± 10H is corrected (S25). By such a table learning process, the recording compensation pattern table can also be corrected in a direction to absorb a variation component unique to a given optical disk.

Next, in the final power learning shown in FIG. 1, the final power learning is performed based on the focus offset value, tracking offset value, and value of the compensation pattern table obtained by the learning process up to now. (S
6). That is, the provisional power learning in step S2 is a temporary power value for performing focus offset learning, tracking offset learning, and table learning, but here, power learning is performed to obtain a final power value. It is.

The final power learning will be described in detail with reference to the flowchart of FIG. 5. The recording power, the erasing power, and the erasing power are respectively calculated using the focus offset value, the tracking offset value, and the value of the compensation pattern table obtained by the above-described learning process. Start power of each power is P ₀
As −04H, writing is performed in a predetermined area of the optical disk while increasing this by 01H (S31). Next, the written data is read (S32), and error lines of the read data are sequentially measured (S33). _Attention is paid to the power value P _{thfinal at} which the absolute value of the number of error lines becomes 80H or less for the first time. It is determined whether or not this value differs from the immediately preceding power value by 80H or more (S34). Although the graph showing the change in the number of error lines in FIG. 6 shows the case of the provisional power, the case of the final power value can be understood in the same manner, and when (a) has a difference of 80H or more,
(B) is less than 80H. 8 of (a)
If there is a difference of 0H or more, the final power value P _{final is set} to P
_thfinal + 02H (S35). In the case of less than 80H in (b), the final power value P _{final is changed} to P _thfinal + 01H
(S36). As a result, a final power value P _final is obtained.

Finally, the final power value P _final thus obtained is further approximated to an optimum value by performing power fine adjustment learning in the present invention. That is, in addition to the final power value P _final, the final power value P _final + 01H, the value of the final power value P _final -01H respectively prepared by performing writing and reading in response to this, to measure the three bit error rate . Then, only when the number of error bytes is improved by 20H or more as an example, the improved power value is selected (S7). FIG. 9B
The graph of this case shows this case, and the final power value P
_final + 01H is the default final power value P
An example is shown in which an improvement of 20H or more is seen over _final , and the final power value is finely adjusted from the final power value P _final to P _final + 01H by this power fine adjustment learning (S7). .

Finally, using the power value, focus offset value, tracking offset value, and recording compensation pattern table of the optical disk optimized as described above, the predetermined value of the optical disk is determined based on the given data. The recording process is performed on the area, and the reproduction process is also performed.

According to the optical disk recording / reproducing apparatus according to the present invention, power learning, focus offset learning, tracking offset learning, and table learning for each optical disk, which are not performed in the conventional apparatus, are performed. By setting the optimum values in consideration of the variations, it is possible to perform data recording processing with greatly improved recording characteristics.

<Other Learning Sequences of the Present Invention> Further, the present invention clearly shows that all of the above-described processes of power learning, focus offset learning, tracking offset learning, and table learning need not necessarily be performed together. Is what you do.

That is, the above-described three-stage power learning does not necessarily need to involve focus offset learning, tracking offset learning, and table learning. By performing power learning in a plurality of stages independently, each of the optical discs that has not existed in the past can be obtained. By using the power value at the value most suitable for the above, it is possible to achieve a very improved data recording process. FIG. 10 is a flowchart for explaining the power learning in a plurality of stages at this time.

In the flowchart of FIG. 10, first, the start values of the recording power and the erasing power are set to P.
₀ and-4H (H is one of the change of the unit), sequentially while adding portions 01H thereto, and writes the data to a predetermined area of the optical disc (S41). When the writing is completed, the written data is read (S42). With respect to the read data, the number of error lines is sequentially measured according to different power values (S43). Then, the absolute value of the number of error lines is focused on the first time 80H hereinafter become power values P _th, the number of errors lines which, by comparing the number of error lines of the power value just before, there is a difference of more than 80H It is determined whether it is (S44). If there is a difference of 80H or more, the power value P is set to _Pth + 02H (S45). If it is less than 80H, the power value P is set to P _th +
01H (S46).

Under these circumstances, fine adjustment of the power value is performed. In addition to the power value P, a power value P + 01H and a power value P-01H are prepared, and writing and reading are performed in accordance with these. The kind of bit error rate is measured (S47). Then, only when the number of error bytes is improved by 20H or more as an example, the improved power value is selected (S48).

As a result, it is possible to perform a fine power value learning process for each optical disc, which cannot be obtained by the conventional apparatus.

Similarly, the above-described focus offset learning, tracking offset learning, and recording compensation table learning can be performed independently without power learning or other learning processing. Also in these cases, it is possible to obtain a focus offset value, a tracking offset value, or a recording compensation table of an optimum value corresponding to each optical disc which has not been provided in the conventional apparatus.

[0081]

As described above in detail, according to the present invention, a power value, a focus offset value, a tracking offset value, and a value of a recording compensation table adapted to a given optical disc variation are automatically obtained by a learning function. Accordingly, it is possible to provide an optical disk recording / reproducing apparatus capable of recording / reproducing data with the highest recording characteristics sufficiently utilizing the specification of the filled optical disk.

[Brief description of the drawings]

FIG. 1 is a flowchart showing a learning sequence according to an embodiment of the present invention.

FIG. 2 is a diagram showing a schematic configuration of an optical disc recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 3 is a flowchart showing details of provisional power learning of a learning sequence according to the embodiment of the present invention.

FIG. 4 is a flowchart showing details of table learning of a learning sequence according to the embodiment of the present invention.

FIG. 5 is a flowchart showing details of final power learning of a learning sequence according to the embodiment of the present invention.

FIG. 6 is a graph showing a relationship between power learning and the number of error lines according to the present invention.

FIG. 7 is an explanatory diagram illustrating a table learning processing operation according to the present invention.

FIG. 8 is a diagram showing an example of table values to be subjected to table learning according to the present invention.

FIG. 9 is a graph illustrating processing operations of focus offset learning, tracking offset learning, and power fine adjustment learning according to the present invention.

FIG. 10 is a flowchart illustrating power learning at a plurality of stages according to another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Optical disk 2 ... Optical pickup (optical head) 5 ... Laser control unit 6 ... Data processing unit 24 ... RAM 25 ... CPU 26a ... Table 30 ... Optical disk recording Playback device

Claims (10)

[Claims] 1. An optical disk recording / reproducing apparatus for recording data in a predetermined area of an optical disk in response to a laser beam emitted from an optical head. Setting means for setting the power value of the laser beam and each parameter value of a recording compensation table used for data recording processing to default values, respectively, based on the recording compensation table set by the setting means, A first writing unit that writes data to a predetermined area of a new optical disc loaded according to the power value and a plurality of power values having values that are different from the power value in a stepwise manner; First measuring means for reading the written data and measuring the number of error lines of the read data, respectively, But according to the number of error lines were measured,
First determining means for determining a power value; and a power value determined by the first determining means;
A second writing unit for writing data to a predetermined area of the optical disk based on a power value higher by a predetermined amount and a power value lower by a predetermined amount; and writing the data written by the second writing unit. A second measuring unit that reads and measures a bit error rate of read data; a second determining unit that determines a final power value based on the bit error rate measured by the second measuring unit; Recording / reproducing means for recording given data on a predetermined area of the optical disk and reproducing the same by emitting a laser beam from the optical head based on the power value determined by the determining means. Optical disk recording and playback device. 2. An optical disk recording / reproducing apparatus for recording data in a predetermined area of an optical disk in response to a laser beam radiated from the optical head. Setting means for setting the power value of the laser beam and each parameter value of the recording compensation table used for data recording processing to default values, respectively, and setting a focus offset of the laser beam of the optical head to a default value. Is provided with a plurality of focus offset values having different values in a stepwise manner, and based on these focus offsets, the power value set by the setting means, and the recording compensation table, data is stored in a predetermined area of a newly loaded optical disc. Writing means for writing, and data written by the writing means Measuring means for reading and measuring the bit error rate of the read data, respectively, according to the bit error rate measured by the measuring means,
Determining means for determining an optimum focus offset value; and irradiating a laser beam from the optical head based on the focus offset value determined by the determining means, thereby recording and reproducing given data in a predetermined area of the optical disc. An optical disk recording / reproducing apparatus, comprising: 3. An optical disk recording / reproducing apparatus for recording data in a predetermined area of an optical disk in response to a laser beam radiated from the optical head. Setting means for setting the power value of the laser beam and each parameter value of the recording compensation table used for data recording processing to default values, respectively, and the laser beam tracking offset of the optical head as a default value. Is provided with a plurality of tracking offset values having different values in a stepwise manner, and based on these tracking offsets, the power value set by the setting means, and the recording compensation table, data is stored in a predetermined area of the loaded new optical disc. Writing means for writing, and data written by the writing means. Measuring means for reading the data and measuring the bit error rate of the read data, respectively, according to the bit error rate measured by the measuring means,
Determining means for determining an optimal tracking offset value, by emitting a laser beam from the optical head based on the tracking offset value determined by the determining means,
An optical disk recording / reproducing apparatus, comprising: recording / reproducing means for recording given data on a predetermined area of an optical disk and reproducing the data. 4. An optical disk recording / reproducing apparatus for recording data in a predetermined area of an optical disk in response to a laser beam emitted from an optical head, wherein the optical head irradiates when receiving a data recording instruction on the optical disk. Setting means for setting a laser beam power value, a focus offset, a tracking offset, and each parameter value of a recording compensation table used for data recording processing to default values, respectively, based on the default values set by the setting means; A first writing unit for writing data to a predetermined area of a new optical disc loaded, a first measuring unit for reading data written by the writing unit, and measuring a shift amount of the data; Corrects each parameter value of the compensation table according to the measured shift amount A second writing unit that writes data to a predetermined area of a new optical disc loaded based on each parameter value of the compensation table corrected by the correction unit; Read the written data,
A second measuring means for measuring these shift amounts; a determining means for determining each parameter value of a final recording compensation table based on at least the measurement results of the first and second measuring means; Recording / reproducing means for emitting a laser beam from the optical head in accordance with the given data based on the determined parameter values of the compensation table, recording data in a predetermined area of the optical disc, and reproducing the data. An optical disk recording / reproducing apparatus characterized by the above-mentioned. 5. An optical disk recording / reproducing apparatus for recording data in a predetermined area of an optical disk in response to a laser beam emitted from an optical head, wherein the optical head irradiates when receiving a data recording instruction on the optical disk. Setting means for setting the power value of the laser beam and each parameter value of the recording compensation table used for data recording processing to default values, and loading based on the power value set by the setting means and the recording compensation table. Data is written to and read from a predetermined area of the new optical disc obtained, a number of error lines are obtained, a provisional power determination means for determining a provisional power value based on the error line, a provisional power determination means and a provisional power determination means. A predetermined area of the optical disc is determined based on the power value and each parameter value of the recording compensation table. Write data to the area, read this, obtain the bit error rate, focus offset determination means to determine the optimal focus offset value based on this, the provisional power value by the setting means and the provisional power determination means, Based on each parameter value of the recording compensation table, data is written to and read from a predetermined area of the optical disk, a bit error rate is obtained, and a tracking offset determining unit that determines an optimal tracking offset value based on the bit error rate; Based on the provisional power value by the setting means and the provisional power determination means and each parameter value of the recording compensation table, data is written to and read from a predetermined area of the optical disc, and a bit error rate is obtained. Parameter values of the simple recording compensation table Table determining means to determine, based on each value determined by the focus offset determining means, the tracking offset determining means table determining means, the table determining means, write processing and read processing to a predetermined area of the optical disc, obtained by Final power determining means for determining a final power value based on the number of error lines obtained, and performing write processing and read processing on a predetermined area of the optical disc in accordance with the final power value determined by the final power determining means. Based on the obtained bit error rate, fine adjustment means for finely adjusting the final power value, and each of the focus offset determination means, the tracking offset determination means, the table determination means, and the fine adjustment means Based on the result of the decision, the laser beam is An optical disc recording / reproducing apparatus, comprising: recording / reproducing means for recording given data on a predetermined area of the optical disc by radiating the data to reproduce the data and reproducing the data. 6. An optical disk recording / reproducing apparatus for recording data in a predetermined area of an optical disk in response to a laser beam radiated from the optical head. A setting step of setting each parameter value of a laser beam power value and a recording compensation table used for data recording processing to a default value, based on the recording compensation table set in the setting step, A first writing step of writing data to a predetermined area of a new loaded optical disk in accordance with the power value and a plurality of power values having values different from the power value in a stepwise manner; A first measuring step of reading the written data and measuring the number of error lines of the read data, respectively; A first determining step of determining a power value in accordance with the number of error lines measured in step 1, a power value determined in the first determining step, and at least a power value larger by a predetermined amount and smaller by a predetermined amount. A second writing step of writing data to a predetermined area of the optical disk based on the power value, and reading the data written in the second writing step,
A second measuring step of measuring a bit error rate of the read data; a second determining step of determining a final power value based on the bit error rate measured in the second measuring step; A recording / reproducing step of recording and reproducing the given data in a predetermined area of the optical disk by radiating a laser beam from the optical head based on the power value determined in the step (a). Recording and playback method. 7. An optical disk recording / reproducing apparatus for recording data in a predetermined area of an optical disk in response to a laser beam radiated from the optical head. Setting a power value of a laser beam and each parameter value of a recording compensation table used for data recording processing to default values, and setting a focus offset of a laser beam of the optical head to a default value. Is provided with a plurality of focus offset values of different values in a stepwise manner, and based on these focus offsets, the power value set in the setting step, and the recording compensation table, data is stored in a predetermined area of a newly loaded optical disc. Writing the data, and writing the data in the writing Reading, and measuring the bit error rate of the read data, respectively; determining the optimal focus offset value according to the bit error rate measured in the measuring step; and determining in the determining step By emitting a laser beam from the optical head based on the focus offset value
A recording / reproducing step of recording and reproducing the given data in a predetermined area of the optical disk, and reproducing the data. 8. An optical disk recording / reproducing apparatus for recording data in a predetermined area of an optical disk in response to a laser beam emitted from an optical head, wherein when receiving a data recording instruction on the optical disk, the optical head irradiates the data. Setting the laser beam power value and each parameter value of a recording compensation table used for data recording processing to default values, and setting the laser beam tracking offset of the optical head to a default value. Is provided with a plurality of tracking offset values having different values in a stepwise manner, and based on these tracking offsets, the power value set in the setting step and the recording compensation table, data is stored in a predetermined area of a new optical disc loaded. And a writing step of writing Reading the data, measuring the bit error rate of the read data, and determining the optimal tracking offset value according to the bit error rate measured in the measuring step; and Recording and reproducing a given data in a predetermined area of the optical disk by radiating a laser beam from the optical head based on the determined tracking offset value, and reproducing the data. Playback method. 9. An optical disk recording / reproducing apparatus for recording data in a predetermined area of an optical disk in response to a laser beam radiated from an optical head. A setting step of setting a laser beam power value, a focus offset, a tracking offset, and each parameter value of a recording compensation table used for data recording processing to default values, respectively, based on the default values set in the setting step A first writing step of writing data in a predetermined area of the loaded new optical disk; a first measuring step of reading data written in the writing step and measuring a shift amount of the data; Correct each parameter value of the compensation table according to the shift amount measured in the process A second writing step of writing data in a predetermined area of a new optical disc loaded based on each parameter value of the compensation table corrected in the correction step; Read the written data
A second measuring step of measuring these shift amounts; a determining step of determining each parameter value of a final recording compensation table based on at least the measurement results in the first and second measuring steps; A recording / reproducing step of emitting a laser beam from the optical head in accordance with the given data, recording data in a predetermined area of the optical disc, and reproducing the data, based on each parameter value of the compensation table determined in the above. An optical disk recording / reproducing method, comprising: 10. An optical disk recording / reproducing apparatus for recording data in a predetermined area of an optical disk in response to a laser beam emitted from an optical head, wherein when receiving a data recording instruction on the optical disk, the optical head irradiates the data. A setting step of setting a laser beam power value and each parameter value of a recording compensation table used for data recording processing to default values, based on the power value and the recording compensation table set in the setting step, Data is written to and read from a predetermined area of the loaded new optical disk, the number of error lines is obtained, a provisional power determination step of determining a provisional power value based on the error line is performed, and the setting step and the provisional power determination step are performed. Based on the provisional power value and each parameter value of the recording compensation table, Data is written to and read from the constant area, a bit error rate is obtained, a focus offset determining step of determining an optimum focus offset value based on the bit error rate, and a provisional power value obtained by the setting step and the provisional power determining step Based on the respective parameter values of the recording compensation table, data is written to and read from a predetermined area of the optical disc, a bit error rate is obtained, and a tracking offset determining step of determining an optimal tracking offset value based on the bit error rate; Based on the provisional power value obtained by the setting step and the provisional power determination step and each parameter value of the recording compensation table, data is written to and read from a predetermined area of the optical disc, and a bit error rate is obtained. Optimum recording compensation table parameters Based on each value determined in the focus offset determining step, the tracking offset determining step table determining step, and the table determining step, a write process and a read process are performed on a predetermined area of the optical disc. A final power determining step of determining a final power value based on the obtained number of error lines; and writing processing to a predetermined area of the optical disc in accordance with the final power value determined in the final power determining step. A fine adjustment step of finely adjusting the final power value based on the obtained bit error rate; and the focus offset determination step, the tracking offset determination step, the table determination step, and the fine adjustment step. From the optical head based on the result of each decision in the adjustment process An optical disc recording / reproducing method, comprising: recording and reproducing given data in a predetermined area of an optical disc by radiating a laser beam;