JP2006134445A - Optical disk drive - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical disk drive capable of shortening the total recording time of an optical disk without an increase in cost by reviewing a system for speeding up such as an improvement in linear velocity with low cost effectiveness. <P>SOLUTION: The optical disk drive which performs recording and reproducing of data to a recording type DVD is equipped with a means for identifying information on the maximum-fold speed at the time of recording the data recorded on the optical disk and a control means for controlling the position of an optical pickup for irradiating a laser beam and the number of revolutions of the optical disk. When data is recorded to a sixteen-fold speed recording type optical disk, the data is made to be recorded at the linear velocity eight times faster than the reference linear velocity from the innermost periphery of the recording region of the optical disk up to the position of a radius 36.5 mm ±5% and the number of revolutions of the disk is raised to 11,000 rpm ±5% in the position of the 36.5 mm ±5% and the data is made to be recorded at the linear velocity twelve times faster than the reference linear velocity from the radius 36.5 mm ±5% up to the outermost periphery of the recording region. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an optical disc apparatus that records and reproduces data on an optical disc, and relates to a technique for shortening the data recording time.

  Currently, recordable DVDs (digital versatile discs) have a standard linear velocity of 3.49 m / s, and the recording speed is formed on a data track from 1 × speed to 2 × 3 times the standard linear velocity. Even those capable of forming recording marks at linear speeds of 4 times, 5 times, 8 times, 12 times and 16 times have been developed. In addition, the intensity and waveform of the laser light applied to the optical disc are different for each double speed, and are standardized.

  By the way, at high recording speeds such as 12 times speed and 16 times speed, the maximum speed of linear velocity can be realized on the outer periphery side of the disk due to the limitation of the disk rotation speed. The linear velocity cannot be achieved. Therefore, when recording data on a high-speed optical disk, as shown in FIG. 6, on the inner or middle side of the disk, recording is performed at a double speed that is lower by one or two stages, and the outer peripheral side that can realize a high linear velocity. In general, the recording method of recording at the maximum double speed is adopted.

  Also, the optical disk has a rotational speed of 7800 revolutions (rpm) at which resonance occurs in the disk itself, or a breaking rotational speed at which a polycarbonate disk substrate is destroyed by a large acceleration applied to each part due to high-speed rotation. It is also known to have constraints.

Conventionally, several techniques have been proposed for devising disk rotation speed control and other incidental processing during recording and reproduction of an optical disk (for example, Patent Documents 1 to 5).
JP 2002-251817 A JP 2003-323758 A JP 2002-324322 A JP 2004-164788 A Japanese Patent No. 3529017

  In general, when changing the recording speed while data is being recorded on an optical disk, it is not sufficient to simply change the rotational speed or the laser beam irradiation method. OPC (Optimum Power Control) that moves to the OPC (Optical Power Calibration) area secured on the outer circumference (radius 57mm to 58mm), and performs test writing at the next changed recording speed to optimize laser power etc. Processing is executed.

  Since such OPC processing involves a movement of the pickup, time loss is relatively large. For example, if recording is performed at a high speed only in a small area of the disc, the OPC processing required for that is faster than shortening the time by high-speed recording. The time spent in the process may be longer.

  As shown in FIG. 4, when the recording linear velocity is increased, the residual error signal ER appearing in the tracking error signal of the optical pickup is usually increased accordingly. Specifically, the residual error signal ER is proportional to the acceleration applied to the data track, that is, increases with the square of the linear velocity. When the residual error signal ER becomes large, the tracking servo is removed. Therefore, the residual error signal ER needs to be set to a predetermined value (for example, 0.03 μm) or less so that the servo is not removed. The performance must be increased. However, since the residual error signal ER increases with the square of the linear velocity, the response performance of the lens actuator needs to be considerably improved in order to slightly increase the recording velocity. That is, there is a problem that the development cost and parts cost are enormous compared to the small effect of slightly increasing the recording speed.

  Conventionally, in order to avoid the destruction of the disk substrate due to the high-speed rotation, the general rule is that the maximum number of rotations of the optical disk is 10,000 rotations (rpm) or less. It has been found that the maximum number of revolutions can be increased even when the required margin is taken.

  SUMMARY OF THE INVENTION An object of the present invention is to review a speed-up method that does not match the cost-effectiveness of improving linear velocity, and to provide an optical disc apparatus capable of improving the total recording speed of an optical disc without increasing the cost.

  In order to achieve the above object, the present invention is an optical disc apparatus that records and reproduces data by irradiating a recording surface of an optical disc (for example, a recordable DVD) with a laser beam. Means for discriminating the information of the maximum double speed, and control means for controlling the position of the optical pickup for irradiating the laser beam and the rotational speed of the optical disc, wherein the control means has a reference linear velocity of 3 at the laser irradiation position. When data is recorded on a 16 × speed recording type optical disc capable of recording data at a speed of 16 × 49 m / s ± 5%, a position having a radius of 36.6 mm ± 5% from the innermost circumference of the recording area of the optical disc Data is recorded at a linear velocity that is eight times the reference linear velocity, and the disk rotation speed is increased to 11000 rpm ± 5% at a radius of 36.6 mm ± 5% to increase the radius to 36.6 mm ± 5%. The data is recorded at a linear velocity 12 times the reference linear velocity up to the outermost periphery of the data recording area.

  According to such means, the total recording time is equal to or less than that required for the OPC processing when switching from 12 times to 16 times compared with the case where only a small area on the outermost periphery is recorded at 16 times speed. The following can be shortened. Furthermore, since the servo performance corresponding to 16 × speed is not required, it is possible to suppress the wasteful development cost and the increase in parts cost that do not meet the effect. Furthermore, since the maximum rotational speed of the disk is set to 11000 rpm ± 5% and the speed is shifted to 12 × from the early stage on the inner circumference side of the disk, the total recording time can be further shortened.

  In addition, the configuration as described above is not limited to recording on an optical disc such as a recordable DVD. Similarly, in an optical disc capable of recording at a plurality of types of double speeds, recording at the maximum X double speed is not used. The same operation and effect as described above can be obtained by setting the maximum rotational speed of the disk to 11000 rpm ± 5% and recording to the outermost circumference by Y-speed recording one step slower than the highest X-speed.

  As described above, according to the present invention, when the total recording time is compared, the time can be shortened to the time equal to or lower than that at the maximum speed, and it is necessary for recording at the maximum speed. This has the effect of eliminating unnecessary development costs and component costs.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  The optical disk apparatus of this embodiment is an apparatus for recording and reproducing data on a recordable DVD called DVD ± R, DVD ± RW, DVD-RAM, and its mechanical configuration and optical configuration are as follows. It is the same as the conventional apparatus.

  That is, although not shown, the optical disk apparatus of this embodiment includes a spindle mechanism that rotates the optical disk at high speed, and a semiconductor laser, an optical sensor, various optical systems, and an objective lens that are slightly displaced at high speed in the focus direction and tracking direction. An optical pickup provided with a lens actuator, a transport mechanism for moving the optical pickup in the radial direction of the disk, a control circuit for controlling drive of the semiconductor laser, the spindle mechanism, and the transport mechanism, and a signal for processing recording data and reproduction data A processing circuit or the like is provided.

  When a recordable DVD is loaded, first, the optical pickup is moved to the area where the disk ID of the optical disk is recorded to perform data reproduction, and from there the information on the recording method of the optical disk and the corresponding double speed. The information is read and recognized. Since these mechanisms are conventionally known, detailed description thereof is omitted.

  FIG. 1 is a graph showing the number of rotations of a disk when data is recorded on a 16 × DVD in the optical disk apparatus according to the embodiment of the present invention. FIG. 2 is a diagram for explaining each area of the optical disk, and FIG. 3 is a correspondence table between each recording speed and linear velocity.

  In the optical disk device of this embodiment, data recording is performed on a 16 × speed recordable DVD by the following method. That is, recording is started at a linear velocity of 8 × from the inner circumference side of the disk in the program area PA where data can be recorded, and the linear velocity of 8 × is obtained by a CLV (Constant Linear Velocity) method up to a radius of 36.6 mm. Continue recording.

  The linear velocity of 8 × speed is 27.9 m / s (see FIG. 3), and the rotational speed of the optical disk gradually decreases as the recording position moves from the state exceeding 10,000 rotations at the recording position with a radius of 25 mm as the recording position moves to the outer peripheral side. The recording position with a radius of 36.6 mm is lower than 7800 revolutions.

  When the recording position reaches a radius of 36.6 mm, the optical pickup is once moved to the OPC area PCA having a radius of 57 mm to 58 mm, and the OPC process is performed at a linear speed of 12 times speed to perform the adjustment adjustment of the laser beam power. .

  After this OPC processing is completed, the optical pickup is moved again to a recording position having a radius of 36.6 mm, and recording is resumed at a linear velocity of 12 × speed. Then, recording is performed at a linear velocity of 12 × speed by the CLV method from this position to a recording position having a maximum radius of 57 mm in the program area PA. The linear velocity of 12 × speed is 41.8 mm (see FIG. 3), and the rotational speed of the optical disk is 11000 rotations at the recording position of 36.6 mm, and the radius gradually decreases as the recording position moves to the outer peripheral side. The number of rotations is lower than 7800 at the recording position.

  FIG. 4 shows a waveform diagram of the tracking error signal at the time of 12 × speed operation and 16 × speed operation.

  As one of the data recording methods, when one data track that is spirally connected from the inner circumference side to the outer circumference side of the program area is recorded on the data track for one rotation, the previous data track is recorded. There is a recording method that verifies whether data has been correctly recorded after migration. When such a recording method is performed, as shown in FIG. 4, since one track is straddled when the rotation pulse U is output, the tracking error signal becomes a large output at this time, but two rotation pulses U , U on one data track, the tracking error of the objective lens by the lens actuator works and the magnitude of the residual error signal RE that becomes noise is 0.03 μm or less (for example, 0.024 μm or less). It can be suppressed.

  However, when the optical disk is rotated at a speed of 16 times speed, the residual error signal RE is proportional to the acceleration of the recording position and thus becomes 1.8 times as large as that at 12 times speed. In the current lens actuator, the tracking servo often deviates beyond 0.03 μm. In order to reduce the magnitude of the residual error signal ER at 16 × speed to 0.03 μm or less, it is necessary to considerably improve the servo characteristics of the lens actuator, which is difficult at present.

  FIG. 5 is a graph showing the relationship between the rotational speed of the optical disk and the acceleration applied to each part.

  The optical disk is subjected to a radial acceleration a in each part by rotation, and the magnitude increases with the square of the number of rotations. When the acceleration a exceeds a certain level, the disk substrate made of polycarbonate is broken, and its rotation speed is about 13,000. Further, when there is a scratch or the like on the disc substrate, the disc breakage occurs at a smaller acceleration a. Therefore, the disc drive can be ignored by setting the rotation speed of the disc device to a maximum of 11,000 with a safety margin. Can be less than a very small probability.

  Therefore, according to the above-described embodiment, wasteful development costs such as making the servo characteristics of the lens actuator correspond to 16 × speed by performing data recording on the 16 × speed optical disc by the recording method of FIG. Compared to a general 16x recording system (see FIG. 6) that requires OPC twice, without incurring component costs and with a small probability that the disk substrate is destroyed by high-speed rotation. The total recording time can be shortened to the same or more.

  The present invention is not limited to the above-described embodiment. For example, the radius for switching from 8 × speed to 12 × speed, the maximum rotation speed, and the linear velocity at the time of 8 × speed or 12 × speed recording are shown in the embodiment. An error of 1-2% of the value and an error of 3-5% are included in the present invention.

  In the above embodiment, the recording method to the recordable DVD has been described. For example, even in an HD (High Definition) DVD, the maximum speed for recording at 8000 rpm to 10000 rpm is defined on the outer periphery. In addition, as in this embodiment, by using a method in which recording is performed up to 11000 revolutions and recording is performed up to the outermost circumference using a double speed lower than the maximum double speed, for example, by one step, without performing the recording at the maximum double speed. The same effects as those of the above embodiment can be obtained.

6 is a graph showing the relationship between the recording position and the disc rotation speed during data recording in the optical disc apparatus according to the embodiment of the present invention. It is the figure which showed an example of the recording area and OPC area | region of an optical disk. It is a table | surface which shows the relationship between recording double speed and linear velocity. It is a wave form diagram which shows the tracking error signal at the time of operation | movement of the rotation pulse output for every rotation and 12 times or less speed, and 16 times speed. 5 is a graph showing the relationship between the rotational speed of an optical disc and the acceleration applied to each part. It is the graph showing the relationship between the recording position at the time of the data recording to the 16 time speed optical disk in the conventional optical disk apparatus, and a disk rotation speed.

Explanation of symbols

10 Optical disk PA Program area PCA OPC area

Claims (2)

An optical disc apparatus that records and reproduces data by irradiating a recording surface of an optical disc with a laser beam,
Means for identifying the information of the maximum speed at the time of data recording recorded on the optical disc;
A control means for controlling the position of the optical pickup for irradiating the laser beam and the rotational speed of the optical disc;
The control means includes
When performing data recording on a 16 × speed recordable optical disc capable of recording data at a linear velocity at the laser irradiation position of 16 times the reference linear velocity of 3.49 m / s ± 5%.
Data is recorded from the innermost circumference of the recording area of the optical disc to a position with a radius of 36.6 mm ± 5% at a linear velocity eight times the reference linear velocity,
The disk rotation speed is increased to 11000 rpm ± 5% at a position of radius 36.6 mm ± 5%, and the data from radius 36.6 mm ± 5% to the outermost periphery of the data recording area is obtained at a linear velocity 12 times the reference linear velocity. An optical disc apparatus characterized by recording an optical disc. An optical disc apparatus that records and reproduces data by irradiating a recording surface of an optical disc with a laser beam,
Means for identifying the information of the maximum speed at the time of data recording recorded on the optical disc;
A control means for controlling the position of the optical pickup for irradiating the laser beam and the rotational speed of the optical disc;
The control means includes
When performing data recording on an optical disc capable of recording data at multiple types of multiple speeds where the linear velocity at the laser irradiation position is the maximum X-speed of the reference linear velocity,
When the linear velocity is set to a Y-times lower than the X-times, the data is recorded from the disk radial position where the disk rotation speed is 11000 rpm ± 5% to the outermost periphery of the data recording area at the Y-times linear velocity. An optical disc device characterized by the above.

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