JP2002150559A - Optical disk recorder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize proper recording to a phase change recording medium the recording condition of which depends on a linear velocity under the control of zone CAV where a recording frequency is fixed in respective zones and the shortest recording wavelength is nearly fixed between the zones. SOLUTION: When recording data on an optical disk where a recording area is divided into zones in the radial direction and a track winding in the direction of a groove width with a fixed frequency within the zone is included, a laser irradiation condition and a recording frequency in recording are obtained from a wobble frequency in each zone and recording is performed by irradiating laser based on these pieces of information, thereby recording under the rotation of the CAV is satisfactorily performed without requiring a complicated equipment.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk recording apparatus for storing a digital information signal on a phase change medium.

[0002]

2. Description of the Related Art Recording and reproduction can be performed on a guide groove (hereinafter referred to as a wobble) having a meandering (hereinafter referred to as wobble) formed on an optical disk, and auxiliary information (hereinafter referred to as a land preamble) is provided on a land portion existing between the guide grooves (grooves). With respect to an optical disk on which a pit has been recorded in advance, a DVD
-RW has been proposed.

[0003]

SUMMARY OF THE INVENTION However, DVD-R
As for W, recording and reproduction are performed at a constant linear velocity, there are places where adjacent wobbles have an opposite phase, crosstalk from adjacent tracks increases, and an area that cannot be used for recording due to deterioration of signal quality is recorded on the disk surface. There are multiple above. In addition, since the phase is reversed, the land pre-pit signal may be deteriorated. Further, when performing a data seek at a large distance in the radial direction, it takes a long time until the rotation speed of the spindle motor falls within a range in which data can be reproduced, so that there is a problem that a data seek time is required.
Also, in order to solve the problem that the wobbles are out of phase and the quality of data is reduced, Japanese Patent Application Laid-Open No. H10-2553 has been proposed.
No. 30, "Optical Disc and Manufacturing Apparatus" discloses that the above-mentioned crosstalk problem is solved by adjusting the phases of adjacent groove wobbles. Not mentioned. On the other hand, the applicant of the present invention has proposed a device for performing recording and reproduction by a zone CAV method in which the recording frequency is changed for each zone while keeping the disk rotation speed constant.
No. 068. According to this application, the seek time can be reduced by keeping the rotation speed constant. However, in the phase-change medium often used for these high-density optical disks, the recording conditions (laser irradiation conditions) change according to the linear velocity. In the above, it is necessary to easily obtain the optimum recording conditions and perform recording to obtain a good recording / reproducing signal without distortion, which has a problem that the apparatus becomes complicated and the cost increases. I was

[0004]

According to the present invention, in order to solve the above-mentioned problems, an information recording area is divided into a plurality of zones in a radial direction, and a spiral continuous guide groove is formed. The meandering in the groove width direction at a constant frequency every time, meandering of adjacent grooves in the zone is in phase, and auxiliary information necessary for recording or reproduction including identification information of the zone is provided between the guide grooves (lands) in advance. An optical disc recording apparatus for recording a digital information signal on a recorded optical disc at a constant disc rotation speed, wherein the wobble detecting means detects a meandering frequency of the guide groove and the wobble detecting means detects the wobble frequency. A recording frequency setting means for generating a recording frequency for each zone from the meandering frequency, and a recording frequency setting means for each zone based on the meandering frequency detected by the wobble detecting means. A recording condition correcting unit for correcting a pulse irradiation condition of a recording laser; and a recording pulse for generating recording pulse data based on the irradiation condition obtained by the recording condition correcting unit at a recording frequency generated by the recording frequency setting unit. Provided is an optical disk recording apparatus having a generating unit and a laser driving unit that irradiates a laser based on the recording pulse data.

[0005]

Embodiments of the present invention will be described below with reference to FIGS. First, the format of the optical disk applied to the optical disk recording device of the present invention will be described. FIG. 1 is an enlarged view of the optical disk. The wobble is recorded at a constant angular velocity in each zone divided in the radial direction, and the phases of adjacent wobbles are always equal in a zone where digital information is recorded in the zone.

[0006] In the land between the zones, at a predetermined position,
A land pre-pit (LPP) in which auxiliary information such as an address and a block number is recorded is recorded. It can be easily estimated that information other than the above can be recorded.

FIG. 2 shows an embodiment of the optical disk recording apparatus according to the present invention. The signal recorded on the optical disc 1 is detected by the pickup 2 and sent to the wobble detecting device 3. On the other hand, a recording signal is sent from the laser drive circuit 4 to the pickup 2.

[0008] The wobble detection device 3 detects a wobble signal from the reproduced signal. Since the rotation speed of the disk 1 is constant, the wobble frequency is constant in the same zone,
Different zones have different wobble frequencies.

In the recording frequency setting device 5, based on the reference clock signal generated by the reference clock generation means 6,
A recording frequency proportional to the wobble frequency obtained by the wobble detection device 3 is set for each zone, and a bit clock of that frequency is sent to the recording pulse generation device 7.

[0010] The recording power correction device 8 specifies a zone from the wobble frequency data obtained by the wobble detection device 3, extracts the laser power intensity corresponding to the zone from the laser power data table and sets it, and sets the laser power information. It is sent to the recording pulse generator 7.

The recording pulse generation device 7 generates a recording pulse train having a predetermined pulse width based on the bit clock input from the recording frequency setting device 5 and the laser power information input from the recording power correction device 8. The drive circuit 4 drives the laser so that light pulses are emitted according to a recording pulse train having a predetermined pulse width.

Next, another embodiment of the optical disk recording apparatus of the present invention will be described with reference to FIG. The same components as those shown in FIG. 2 are denoted by the same reference numerals, and description thereof may be omitted. The wobble detection device 3 detects a wobble signal from the reproduced signal. The recording frequency setting device 5 sets a recording frequency in proportion to the wobble frequency obtained by the wobble detection device 3 for each zone based on the reference clock signal generated by the reference clock generation means 6, and sets a clock of the frequency. Is sent to the recording pulse generation device 7.

The recording pulse correction device 80 specifies a zone from the wobble frequency data obtained by the wobble detection device 3 and extracts information on the recording pulse form corresponding to the zone from the pulse data table and sets it.
Information regarding the recording pulse form is sent to the recording pulse generation device 7.

The recording pulse generation device 7 includes a clock input from the recording frequency setting device 5 and a recording pulse correction device 8.
A recording pulse train is generated based on the information on the recording pulse form input from 0, and the laser driving circuit 4 drives the laser so that the light pulse is irradiated in accordance with it.

FIG. 4 shows an example of recording pulse correction in these embodiments. This is an example showing a change in the shape of a recording pulse irradiated in a zone A and a shape of a recording pulse irradiated in another zone B with respect to a mark length to be recorded.
(A) shows an increase in recording laser power compared to zone A (according to the embodiment of FIG. 2), (b) shows a case where the width of an optical pulse irradiated during recording is reduced, and (c) shows In this example, the width of the light pulse irradiated during recording is reduced, and the recording laser power is increased only for the first pulse (according to the embodiment of FIG. 3).

According to the method shown in these embodiments, a complicated device configuration is not required, and a disk having regions having different recording frequencies or linear velocities is used by utilizing the frequency of a wobble applied to a track. High-density recording can be performed with high accuracy. The rotation control of the recording apparatus shown in these embodiments is control relating to CAV rotation.

Therefore, as a recording frequency for each zone,
If you select a value proportional to the radius of the innermost track in each zone,
The shortest recording mark length becomes substantially constant. Since the wobble frequency is proportional to the recording frequency, zone CAV recording can be performed by using a disc whose wobble frequency is proportional to the radius of the innermost track of each zone. As described above, according to the present invention, since the recording conditions (laser irradiation conditions) can be set for each zone, the CA in which the linear velocity changes greatly can be set.
Even under V (zone CAV) control, proper recording on the phase change recording medium can be performed.

[0018]

As described above, according to the present invention, the recording condition is dependent on the linear velocity under the zone CAV control in which the recording frequency is constant for each zone and the shortest recording wavelength is substantially constant between the zones. It is possible to provide an optical disk recording device that enables appropriate recording on a change recording medium.

[0019]

[Brief description of the drawings]

FIG. 1 is a configuration example of a track format of an optical disc.

FIG. 2 is a diagram showing an embodiment of a recording device for an optical disk according to the present invention.

FIG. 3 is a diagram showing another embodiment of the recording device of the optical disk according to the present invention.

FIG. 4 is a diagram illustrating an example of a recording pulse correction method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Optical disk, 2 ... Pickup, 3 ... Wobble detection device, 4 ... Laser drive circuit, 5 ... Recording frequency setting device, 6 ... Reference clock generation means, 7 ... Recording pulse generation device, 8 ... Recording power correction device, 80 ... Recording pulse correction device,

Claims (3)

[Claims] An information recording area is divided into a plurality of zones in a radial direction, and a continuous spiral guide groove (groove) meanders in a groove width direction at a constant frequency for each zone.
The meandering of adjacent grooves in the zone has the same phase, and a digital information signal is transmitted to an optical disc in which auxiliary information necessary for recording or reproduction including zone identification information is recorded in advance between guide grooves (lands). An optical disc recording apparatus for recording at a constant rate, comprising: a wobble detecting means for detecting a meandering frequency of the guide groove; and a recording frequency for each zone is generated from the meandering frequency detected by the wobble detecting means. A recording frequency setting unit, a recording condition correction unit that corrects a pulse irradiation condition of a recording laser for each zone from a meandering frequency detected by the wobble detection unit, and a recording frequency generated by the recording frequency setting unit. A recording pulse generator for generating recording pulse data based on the irradiation conditions obtained by the recording condition correction means. An optical disc recording apparatus comprising: a driving unit that emits a laser based on the recording pulse data. 2. The recording condition correcting unit corrects a recording laser pulse irradiation condition for each zone by changing a recording laser power value according to a meandering frequency detected by the wobble detecting unit. The optical disk recording device according to claim 1, wherein: 3. The recording condition correction means corrects the pulse irradiation condition of the recording laser for each zone by changing a light pulse shape applied at the time of recording according to a meandering frequency detected by the wobble detection means. The optical disk recording device according to claim 1, wherein: