JP2003006862A - Optical disk device and optical disk recording method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical disk device that can accurately record information with an excellent recording efficiency to the optical disk. SOLUTION: The optical disk device comprises a reproducing means 20 reproducing the record information related to a record from the optical disk, a parameter generating means 70 generating a plurality of record parameters corresponding to linear speed varying in response to the radius position of the optical disk is located when the optical disk is rotated at a constant rotation speed based on this record information, a pulse generating means 60 generating a record waveform pulse corresponding to record data recorded to the radius position of a target based on a plurality of these record parameters, and a recording means 20 recording the record data to the radius position of the target based on this record waveform pulse.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disc device for recording information on an optical disc. The present invention also relates to an optical disc recording method for recording information on an optical disc.

[0002]

2. Description of the Related Art CAV is used as an optical disc rotation system.
(Constant Angular Velocity) method and CLV (Constant Angular Velocity) method
The ant linear velocity method is known. The CAV method is a method in which an optical disk is constantly driven to rotate at a constant rotation speed. The CLV system is a system in which the optical disc is rotationally driven by changing the rotational speed so that the linear velocity at the radial position of the access destination is constant. The merit of the CAV method is that the rotation speed is constant, so that the rotation control is easy, and the demerit is that the recording efficiency becomes poor because the data recording density becomes sparser toward the outer peripheral side. On the other hand, the merit of the CLV method is that the data recording density is substantially uniform over the entire area of the disc, so that the recording efficiency is excellent, and the demerit is that the rotation control becomes complicated.

[0003]

As described above, the CA
When the V method is adopted, there arises a problem that the recording efficiency is poor,
When the CLV method is adopted, there arises a problem that rotation control becomes complicated.

Japanese Unexamined Patent Publication No. 9-17008 discloses an optical disk master exposure apparatus which can control the light quantity based on the solid linear velocity to make the pit quality uniform and stable. However, even if the light amount control is performed based on the solid linear velocity, there still remains a problem that the data cannot be accurately recorded to some extent.

SUMMARY OF THE INVENTION An object of the present invention is to provide the following optical disk device and optical disk recording method in view of the above circumstances.

(1) An optical disc device capable of accurately recording information on an optical disc with excellent recording efficiency.

(2) An optical disc recording method capable of accurately recording information on an optical disc with excellent recording efficiency.

[0008]

In order to solve the above problems and achieve the object, the optical disk recording apparatus and the optical disk recording method of the present invention are configured as follows.

(1) The optical disk recording apparatus of the present invention comprises:
Reproducing means for reproducing recording information relating to recording from the optical disc, and corresponding to different linear velocities depending on the radial position of the optical disc generated when the optical disc is rotated at a constant rotation speed, based on the recording information reproduced by the reproducing means. Parameter generating means for generating a plurality of recording parameters, pulse generating means for generating a recording waveform pulse corresponding to the recording data to be recorded at the target radial position, based on the plurality of recording parameters generated by the parameter generating means, Recording means for recording the recording data at the target radial position based on the recording waveform pulse generated by the pulse generating means.

(2) According to the optical disc information recording method of the present invention, the optical disc is rotated at a constant speed based on the first step of reproducing the record information related to the recording from the optical disc and the record information reproduced by the first step. A second step of generating a plurality of recording parameters corresponding to different linear velocities depending on the radial position of the optical disc generated when the optical disc is rotated at a speed; and a plurality of recording parameters generated by the second step. A third step of generating a recording waveform pulse corresponding to the recording data to be recorded at the radial position, and a fourth step of recording the recording data at the target radial position based on the recording waveform pulse generated by the third step. And are equipped with.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an example of the optical disk device of the present invention. This optical disk device records information on an optical disk and reproduces information from the optical disk. As shown in FIG. 1, the optical disk device includes a spindle motor 10, a recording / reproducing unit (recording unit, reproducing unit) 20, and a first parameter table 3.
0, a second parameter table 40, a parameter correction unit 50, a recording waveform pulse control unit 60, and a parameter calculation unit 70.

The spindle motor 10 rotates the optical disc 1 at a predetermined rotation speed. The recording / reproducing unit 20 records data on the optical disc 1 and reproduces the data recorded on the optical disc 1. This recording / playback unit 2
Details of 0 will be described later in detail. The first parameter table 30 stores a recording waveform parameter 1 (reference recording parameter) for recording on the innermost circumference of the optical disc 1, for example. Second parameter table 40
Stores a recording waveform parameter 2 (reference recording parameter) for recording on the outermost circumference of the optical disc 1, for example. The recording parameter is a waveform correction amount related to the position / phase, width or height of the pulse before and after the recording waveform. The parameter correction unit 50 uses the first parameter table 30.
The recording waveform parameter 1 stored in 1) and the recording waveform parameter stored in the second parameter table 40 are corrected as necessary, and the corrected recording waveform parameter is supplied to the recording waveform pulse control unit 60. The recording waveform pulse control unit 60 controls the recording waveform pulse based on the recording waveform parameter supplied from the parameter correction unit 50, and supplies an appropriate recording waveform pulse to the recording / reproducing unit. The parameter calculator 70 calculates a recording waveform parameter based on the reproduction signal (binarized signal) and the channel clock supplied from the recording / reproducing unit.

The optical disk 1 to be processed by this optical disk device is a rewritable medium having a phase change recording layer as an information recording layer, for example. More specifically, this optical disc 1 is a DVD-RAM disc having a storage capacity of 4.7 GB per side, for example. Although not shown, the optical disc 1 has a lead-in area on the inner circumference side, a lead-out area on the outer circumference side, and a data area between the lead-in area and the lead-out area. The lead-in area includes a recording information area for storing recording information regarding recording on the disc. In this recording information area, for example, information indicating what the recording waveform looks like can be stored.
The data area of the optical disc 1 is divided into a plurality of data zones arranged in a concentric ring shape on the recording surface.

The optical disk device controls the rotation of the optical disk 1 for each data zone so that the linear velocity becomes substantially constant for each data zone. In other words, different rotation speeds are assigned to the respective data zones in advance (the rotation speeds of the inner data zones are higher). This type of rotation control method is used for ZCLV (Zone Constant Linear Velocity)
Called the method. Since each data zone includes spiral tracks for a plurality of turns, the track on the inner circumference side and the track on the outer circumference side in each data zone are strictly different in linear velocity. That is, the ZCLV method described above is the same as the rotation control by the CAV method in each data zone. Therefore, the optical disc device controls the rotation of the optical disc at a constant rotation speed assigned to a predetermined data zone.

FIG. 2 is a block diagram showing details of the recording / reproducing unit 20 in the optical disk device shown in FIG. Figure 2
As shown in, the recording / reproducing unit 20 includes an LD driver 21,
Photodetector 22, preamplifier 23, slicer 24, PLL
The circuit 25 is provided.

FIG. 3 is a block diagram showing the details of the recording waveform pulse control unit 60 in the optical disk device shown in FIG. As shown in FIG. 3, the recording waveform pulse control unit 60
Includes an NRZI converter 61, a run length detector 62, a first pulse generator 63, a multi-pulse generator 64, a last pulse generator 64, and a recording pulse generator 65.

FIG. 4 is a timing chart showing the operation of the recording waveform pulse control section 60. Upon receiving the recording data and the reference clock from the outside, the recording waveform pulse control unit 60 generates a recording waveform pulse (including information corresponding to the recording data) based on the supplied waveform correction amount.

The recording operation of the above-mentioned optical disk device will be specifically described below.

The LD driver 21 is driven based on the recording waveform pulse output from the recording waveform pulse control section 60,
The information recording surface (phase change recording layer) of the optical disc 1 is irradiated with a recording light beam having a predetermined wavelength. With the irradiation of the recording light beam, recording marks are formed on the phase change recording layer of the optical disc. This is the recording of data. This recording is performed by a mark length recording system in which information is provided at the edge of the recording mark. At the time of reproduction, the LD driver 21 irradiates the information recording surface of the optical disc 1 with a reproduction light beam.
The reflected light of the reproduction light beam is detected as a weak analog electric signal by the photodetector 22, amplified by the preamplifier 23, and converted into a binary signal by the slicer 23. A channel clock is generated by the PLL circuit 25 based on the binarized signal. The binarized signal and the channel clock are supplied to the parameter calculator 70.

Here, the operation of the parameter calculation section 70 will be described with reference to the flowchart shown in FIG. The parameter calculator 70 detects the condition of the edges before and after the target mark to be read based on the supplied binarized signal and channel clock, and calculates the recording waveform parameter. The calculated parameters are recorded in the first parameter table 30 and the second parameter table 40, respectively, according to the conditions for calculation (for example, the recording position of the disc and the linear velocity of the disc at the time of recording). The recorded parameters of the first parameter table 30 and the second parameter
The parameters of the parameter table 40 are corrected by the parameter correction unit 50 according to the actual recording conditions, and the actual waveform correction amount is supplied to the recording waveform pulse control unit 60.

The above description will be supplemented below with reference to the flowchart shown in FIG. First, a random series of data (data including various patterns) having a reference waveform with zero compensation amount is recorded in a predetermined sector of the DVD-RAM disc 1 (ST10), and the phase difference amount for each pattern is calculated from this predetermined sector. Capture (ST12).

Next, the average value of the phase difference amount for each pattern is calculated for each of the front end / rear end of the target mark. At that time, the weighted average value is calculated according to the run length occurrence frequency for each space / mark (ST14).

The reason for performing this weighting is that, in the 8-16 modulation, the short run length (3T to 5T) is more frequently generated than the long run length (6T to 11T). This is because finding the average value for does not match the actual situation.

If the average value thus calculated is less than or equal to the predetermined value (YES in ST16), it is determined that the compensation amount for the recording waveform is appropriate at present and the recording waveform is fixed. When the calculated average value exceeds the predetermined value (NO in ST16), it is determined that the current compensation amount is inappropriate. In this case, the compensation amount that cancels the average value calculated for the reference waveform, that is, the compensation amount in the direction such that the answer is YES in ST16 is calculated (ST18). Then, recording on the disc 10 with the calculated new compensation amount (ST1
0), taking in the phase difference amount by pattern (ST12) and calculating the average value of the phase difference amount by pattern (ST14) are repeated, and it is rechecked whether the weighted calculated average value is less than or equal to a predetermined value (ST16).

If the calculated average value still exceeds the predetermined value (NO in ST16), it is determined that the current compensation amount is still inadequate. In this case, the processing loop (ST10 to ST in FIG. 5 is performed until an appropriate compensation amount is obtained.
18) is re-executed.

Referring to FIG. 6, the recording operation (generation of recording waveform parameters) by the above-described optical disk device of the present invention will be summarized.

First, the recording / reproducing section 20 reproduces recording information relating to recording from the optical disc 1 (ST2).
0). The parameter calculation unit 70 generates a plurality of recording parameters corresponding to different linear velocities depending on the radial position of the optical disc generated when the optical disc is rotated at a constant rotational speed, based on the previously reproduced recording information (ST
22). The recording waveform pulse control unit 60 generates a recording waveform pulse corresponding to the recording data to be recorded at the target radial position based on the generated plurality of recording parameters (ST24). The recording / reproducing unit 20 records the recording data at the target radial position based on the generated recording waveform pulse (ST26).

Now, the generation of the recording parameters will be described in detail. A plurality of recording parameters are generated based on the reproduced recording information and the reference recording parameters stored in advance. For example, the previously stored reference parameters for the innermost circumference and the outermost circumference are corrected and used as correction parameters. In addition, for example, the previously stored reference parameters for the innermost circumference and the outermost circumference are corrected and used as correction parameters, and the gap between the reference parameters for the innermost circumference and the outermost circumference is supplemented. The parameter is interpolated and this is also used as a correction parameter. If the previously stored reference parameters for the innermost circumference and the outermost circumference are used as they are, accurate recording cannot be performed (it is not possible to cope with subtle changes). Therefore, the reference parameters for the innermost circumference and the outermost circumference are corrected and used based on the reproduced record information. This enables accurate recording. Further, more accurate recording can be performed by interpolating parameters that supplement the reference parameters for the innermost circumference and the outermost circumference.

Alternatively, the recording / reproducing unit 20 trial-writes data at a plurality of different radial positions of the optical disc which is rotated at a constant rotational speed, and based on the result of reproducing the trial-written data, the optical disc of the optical disc is read. It is also possible to generate a plurality of recording parameters corresponding to different linear velocities depending on the radial position.

Alternatively, the recording / reproducing unit 20 trial-writes data at a predetermined radial position of the optical disc rotated at a plurality of different rotation speeds, and different lines are reproduced based on the result of reproducing the trial-written data. It is also possible to generate a plurality of recording parameters corresponding to the speed.

As a result, the following effects can be obtained.
When performing phase change recording on an optical disc, a method is known in which only one recording parameter is determined on the inner circumference of the optical disc to keep the linear velocity substantially constant and information is recorded. However, some control is required to keep the linear velocity constant, and it takes some time before the linear velocity becomes constant. Therefore, there is a problem in recording efficiency. According to the present invention, a plurality of types of recording parameters are generated and recording is performed based on the recording parameters, so that even if the linear velocity of the optical disk is variable (each data zone in the CAV system or the ZCLV system), a uniform recording density (outer peripheral side) The information can be recorded correctly by () so that the recording density of will not become sparse. Specifically, recording parameters for the innermost circumference and recording parameters for the outermost circumference are prepared in advance,
A plurality of recording parameters are generated by correcting these or interpolating between them. Alternatively, a method of trial writing is used to generate a plurality of types of recording parameters based on the reproduction result of the trial written data. At this time, a method is conceivable in which the disc is rotated at a constant rotation speed and trial writing is performed at different radial positions, or trial writing is performed at one location on the disc and the disc is rotated at different rotation speeds.

The invention of the present application is not limited to the above-described embodiment, and can be variously modified at the stage of implementation without departing from the scope of the invention. In addition, the respective embodiments may be combined as appropriate as much as possible, in which case the combined effects can be obtained. Further, the embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. For example, even if some constituent elements are deleted from all the constituent elements shown in the embodiment, the problem described in the section of the problem to be solved by the invention can be solved, and the effect described in the section of the effect of the invention If you get
A configuration in which this component is deleted can be extracted as an invention.

[0034]

According to the present invention, the following optical disk device and optical disk recording method can be provided.

(1) An optical disk device capable of accurately recording information on an optical disk with excellent recording efficiency.

(2) An optical disc recording method capable of accurately recording information on an optical disc with excellent recording efficiency.

[Brief description of drawings]

FIG. 1 is a block diagram showing an example of an optical disk device of the present invention.

FIG. 2 is a block diagram showing details of a recording / reproducing unit in the optical disc device shown in FIG.

FIG. 3 is a block diagram showing details of a recording waveform pulse control unit in the optical disc device shown in FIG.

FIG. 4 is a timing chart showing the operation of the recording waveform pulse control unit.

FIG. 5 is a flowchart illustrating an operation of a parameter calculation unit.

FIG. 6 is a flowchart illustrating a recording operation (generation of a recording waveform parameter) by the optical disc device of the present invention.

[Explanation of symbols]

1 ... Optical disc 10 ... Spindle motor 20 ... Recording / reproducing unit 20 30 ... First parameter table 40 ... Second parameter table 50 ... Parameter correction unit 60 ... Recording waveform pulse control unit 70 ... Parameter calculation unit

Claims (14)

[Claims] 1. Playback means for playing back record information relating to recording from an optical disc, and based on the record information played back by the playback means,
Parameter generating means for generating a plurality of recording parameters corresponding to the radial position of the optical disc, and a recording waveform pulse corresponding to the recording data to be recorded at the target radial position, based on the plurality of recording parameters generated by the parameter generating means. An optical disk device comprising: a pulse generating unit for performing recording; and a recording unit for recording recording data at a target radial position based on the recording waveform pulse generated by the pulse generating unit. 2. A reproducing means for reproducing recorded information related to recording from an optical disc, and based on the recorded information reproduced by the reproducing means,
Parameter generating means for generating a plurality of recording parameters corresponding to different linear velocities according to the radial position of the optical disk generated when the optical disk is rotated at a constant rotation speed, and the plurality of recording parameters generated by the parameter generating means. Pulse generating means for generating a recording waveform pulse corresponding to the recording data to be recorded at the target radial position, and recording means for recording the recording data at the target radial position based on the recording waveform pulse generated by the pulse generating means. An optical disk device comprising: 3. The plurality of recording parameters based on the storage means for storing reference recording parameters, the recording information reproduced by the reproducing means, and the reference recording parameters stored in the storage means. 3. The optical disk device according to claim 1, further comprising: a calculating unit that calculates 4. The parameter generating means stores storage means for storing reference recording parameters for the innermost circumference and the outermost circumference, and the storage means stored in the storage means based on the recording information reproduced by the reproducing means. The optical disc device according to claim 1 or 2, further comprising: a calculating unit configured to correct the reference parameters for the inner circumference and the outermost circumference to calculate the plurality of recording parameters. 5. The parameter generating means stores storage means for storing reference recording parameters for the innermost circumference and the outermost circumference, and the storage means stored in the storage means based on the recording information reproduced by the reproducing means. Correcting the reference parameters for the inner circumference and the outermost circumference, and calculating a part of the plurality of recording parameters, and interpolating the parameters that supplement between the reference parameters for the innermost circumference and the outermost circumference, The optical disc device according to claim 1 or 2, further comprising: a calculating unit that calculates the rest of the plurality of recording parameters. 6. A test writing means for trial-writing data to a plurality of different radial positions of an optical disc rotated at a constant rotation speed, wherein the parameter generating means is trial-written by the test writing means. The optical disc apparatus according to claim 1, wherein the plurality of recording parameters corresponding to the radial position of the optical disc are reproduced by reproducing the data. 7. A test writing means for trial-writing data to a predetermined radial position of an optical disc rotated at different rotation speeds, wherein the parameter generating means writes the data trial-written by the trial-writing means. The optical disc device according to claim 1 or 2, wherein the plurality of recording parameters corresponding to different linear velocities are reproduced. 8. A first step of reproducing record information related to recording from an optical disc, and a plurality of recording parameters corresponding to a radial position of the optical disc, based on the record information reproduced in the first step. The second step, the third step of generating a recording waveform pulse corresponding to the recording data to be recorded at the target radial position based on the plurality of recording parameters generated by the second step, and the third step An optical disc recording method comprising: a fourth step of recording recording data at a target radial position based on the generated recording waveform pulse. 9. A first step of reproducing record information related to recording from an optical disc, and a radius of the optical disc generated when the optical disc is rotated at a constant rotation speed based on the record information reproduced in the first step. A second step of generating a plurality of recording parameters corresponding to different linear velocities depending on the position, and recording data to be recorded at the target radial position based on the plurality of recording parameters generated in the second step. A third step of generating a recording waveform pulse; and a fourth step of recording recording data at a target radial position based on the recording waveform pulse generated by the third step. Optical disc recording method. 10. The second step calculates the plurality of recording parameters based on the recording information reproduced in the first step and a reference recording parameter stored in advance. Item 10. The optical disc recording method according to Item 8 or 9. 11. The second step corrects the reference parameters for the innermost circumference and the outermost circumference, which are stored in advance, based on the recording information reproduced in the first step, to thereby perform the plurality of recordings. The optical disk recording method according to claim 8 or 9, wherein a parameter is calculated. 12. The second step corrects the prestored reference parameters for the innermost circumference and the outermost circumference on the basis of the recording information reproduced in the first step, to thereby perform the plurality of recordings. 9. A part of the parameters is calculated, and a parameter that complements these reference parameters for the innermost circumference and the outermost circumference is interpolated to calculate the rest of the plurality of recording parameters. Or the optical disc recording method described in 9 above. 13. A test writing step of test-writing data to a plurality of different radial positions of an optical disk rotated at a constant rotation speed, wherein the second step is test-written by the test writing step. The optical disc recording method according to claim 8 or 9, wherein the plurality of recording parameters corresponding to the radial positions of the optical disc are reproduced. 14. A test writing step of test-writing data to a predetermined radial position of an optical disk rotated at a constant rotation speed, wherein the second step is test-written by the test-writing means. The optical disc recording method according to claim 8 or 9, wherein data is reproduced and the plurality of recording parameters corresponding to different linear velocities are generated.