JP2004046976A - Writing speed switching method for optical disk device, and optical disk device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a writing speed switching method for an optical disk device, capable of shortening the data writing time as a whole by shortening the time of speed switching. <P>SOLUTION: The writing speed switching method for an optical disk device 30 provided with a zone CLV control means 32 for switching a linear velocity in stages, and a recording protection means 31 to control to suspend data writing until a predetermined amount of data or more is stored in a buffer memory 16 when buffer underrunning occurs is characterized in that when data writing reaches the address of a writing speed to be switched, the recording protection means 31 is actuated irrespective of a data residual amount in the buffer memory 16 to suspend data writing and, after the suspension, a linear speed at the time of writing is switched to resume the data writing. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a writing speed switching method in an optical disk device controlled by a zone CLV system in which the linear velocity at the time of writing is increased stepwise toward the outer peripheral side of an optical disk, and the optical disk device is controlled.
[0002]
[Prior art]
As an optical disk device for recording data on an optical disk, a CD-R (Compact Disc-Recordable) device and a CD-RW (Compact Disc-Rewritable) device are known.
[0003]
When writing data to an optical disc, the rotation of the optical disc is controlled by a so-called CLV (Constant Liner Velocity) method in which the linear velocity of writing is kept constant so that the density of the written pits is kept constant. It is common that In the CLV method, the linear velocity is kept constant over the entire surface of the optical disk, so that when writing the inner circumference of the optical disk, the rotation speed of the optical disk by the spindle motor is increased, and the rotation speed is reduced toward the outer circumference of the optical disk. Is controlled.
On the other hand, in recent optical disk devices, it is desired that data be written to the optical disk at a higher speed than before. However, in the case of the CLV system, if only the linear velocity is to be increased only, the There has been a problem that the rotation speed on the peripheral side becomes too high, and data cannot be reliably written on the inner peripheral side.
[0004]
Therefore, there is an optical disk device controlled by a zone CLV control method in order to shorten the writing time of the entire optical disk without increasing the rotation speed on the inner peripheral side of the optical disk and to increase the writing speed as a whole.
In the zone CLV method, the writing is performed at a constant low linear velocity on the inner circumference of the optical disc. Therefore, the rotation speed of the optical disc on the inner circumference is the same as the conventional one. This is a system that attempts to increase the linear velocity.
[0005]
FIG. 6 shows an example of data writing by the zone CLV method.
In this example, writing is performed at 16 × speed in the innermost zone 2 of the optical disk 10, writing at 20 × speed in the outer zone 3 and writing at 24 × speed in the outermost zone 4.
By employing the zone CLV method in this manner, the inner circumference of the optical disc 10 rotates at the conventional rotation speed, so that no writing error occurs on the inner circumference and the writing time can be shortened as a whole. Was.
[0006]
In the zone CLV system, switching of the linear velocity cannot be performed in principle while data writing is being performed continuously. This is because, when the linear velocity is increased, data that has already been written is read from the optical disk at the increased speed, and the phase of the read data and the data to be written at the increased speed are matched. This is because they have to be synchronized.
Therefore, when switching the linear velocity, it is necessary to temporarily suspend data writing.
[0007]
In order to temporarily stop data writing, a recording protection means (burn proof, just link, etc.) provided to prevent a buffer underrun (a state in which data to be written is lost and a writing error occurs). At present, the writing of data is interrupted using a program known by its name.
[0008]
Hereinafter, the operation of the conventional optical disc device in the zone CLV system at the time of switching the linear velocity will be described with reference to FIGS. 6, 7, and 8. FIG. In FIG. 8, the vertical axis represents the remaining amount of data in the buffer memory and the number of rotations of the spindle motor, and the horizontal axis represents time.
First, an optical pickup writes data along a pre-groove x formed on an optical disc. When the optical pickup approaches the vicinity of the address A at which the linear velocity should be switched (switching instruction address B), the control means issues a switching instruction (time t1 in FIG. 8). The data flowing into the buffer memory is cut off by the switching instruction of the control means.
As the data flow into the buffer memory is cut off, the data in the buffer memory decreases.
When the remaining amount of data in the buffer memory decreases below a predetermined capacity, the recording protection means operates to prevent a writing error due to a buffer underrun, and the data writing is temporarily interrupted (time t2 in FIG. 8).
[0009]
After the interruption of the data writing due to the operation of the recording protection means, the control means releases the interruption of the accumulated data flowing into the buffer memory. Then, data is accumulated again in the buffer memory.
Further, after the data writing is interrupted, the optical pickup is returned by a predetermined distance, and while the linear velocity at the time of writing is increased, the phase is synchronized between the already written data and the data to be written next so as to synchronize. To
When the amount of data stored in the buffer memory reaches a predetermined amount and the already written data and the data to be written are synchronized, the data writing is restarted at the switched speed (FIG. 8, time t3).
[0010]
[Problems to be solved by the invention]
As described above, when writing data by the zone CLV method, when switching the writing speed, it is necessary to temporarily suspend the data writing by activating the recording protection means. The operation of the recording protection means is performed by interrupting the accumulation of data in the buffer memory and intentionally causing a buffer underrun.
Therefore, depending on the actual amount of data stored in the buffer memory when the data inflow into the buffer memory is interrupted, the time (from the interruption of the data inflow to the time when the remaining amount of data in the buffer memory becomes a predetermined amount) ( 8 corresponds to (t3-t1) in each case. That is, as the remaining amount of data in the buffer memory becomes closer to full, it takes time until the data is reduced and the recording protection unit is activated, so that the position at which the speed is switched is delayed.
If the timing of the speed switching is delayed, data is written at a low linear speed up to the switching position, so that there is a problem that the recording time of the entire disc is prolonged.
[0011]
Further, as shown in FIG. 8, as long as the control is performed by the CLV, the actual rotation speed of the spindle motor gradually decreases unless the speed is switched. Therefore, as the remaining amount of the buffer memory becomes closer to full, the data decreases and the time until the recording protection means is activated is delayed, and the rotation speed at the time of interrupting the writing is further reduced in proportion to the delay of the time. To go.
If the rotation speed at the time of interruption of writing slows down, it takes time to increase the rotation speed at the time of resuming writing to the maximum allowable speed.Therefore, writing must be restarted when the rotation speed reaches a certain rotation speed after all. Absent.
As described above, if the timing of the speed switching is delayed, the recording time of the entire disc is prolonged by that much, and the rotation speed of the spindle motor becomes lower than the allowable maximum rotation speed when writing is resumed. There is a problem of getting it.
[0012]
The present inventors, when operating the recording protection means at the time of speed switching in the zone CLV system, if the recording protection means is operated regardless of the remaining amount of data in the buffer memory, an instruction to perform the speed switching is given. I came up with the idea that it would be possible to shorten the time from when there was actually a speed change.
[0013]
Therefore, the present invention has been made to solve the above-mentioned problem, and an object of the present invention is to shorten the time at the time of speed switching when writing data to an optical disc by the zone CLV method, thereby shortening the data writing time as a whole. It is an object of the present invention to provide a writing speed switching method in an optical disk device and an optical disk device that can perform the method.
[0014]
[Means for Solving the Problems]
That is, according to the writing speed switching method in the optical disk device according to the present invention, there is provided a zone CLV control means for controlling so as to write data by increasing the linear velocity at the time of writing stepwise toward the outer periphery of the optical disk. Before writing data, the remaining amount of data in the buffer memory for temporarily storing data is checked. If a buffer underrun occurs, the data writing is suspended until a predetermined amount or more of data is accumulated in the buffer memory. A write speed switching method in an optical disk device, comprising: a write protection unit for controlling the write protection at a write speed switching address; Operation, the data writing is interrupted once, and after the interruption, the linear speed at the time of writing is switched. It is characterized in that to resume over data writing.
By adopting this method, when the speed is to be switched, the speed is switched by operating the recording protection means regardless of the amount of data stored in the buffer memory at this time. For this reason, the time from interrupting data writing to switch the speed to resuming data writing by increasing the speed can be shortened as compared with the related art, so that the overall writing time can be further reduced. be able to.
[0015]
Further, according to the optical disk device of the present invention, zone CLV control means for controlling to write data by increasing the linear velocity at the time of writing stepwise toward the outer peripheral side of the optical disk; Checks the remaining amount of data in the buffer memory that temporarily stores data, and if a buffer underrun occurs, controls data writing so that data writing is interrupted until a predetermined amount or more of data is accumulated in the buffer memory. Means, when data writing arrives at the address at which the writing speed is to be switched, operates the recording protection means regardless of the remaining amount of data in the buffer memory to temporarily suspend the data writing; Control means for switching the linear velocity at the time of writing after the interruption and controlling to restart data writing. It is characterized.
By adopting this configuration, when the speed is to be switched, the speed is switched by activating the recording protection means regardless of the amount of data stored in the buffer memory at this time. For this reason, the time from interrupting data writing to switch the speed to resuming data writing by increasing the speed can be shortened as compared with the related art, so that the overall writing time can be further reduced. be able to.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
First, the operation of the present invention will be described with reference to FIGS. In FIG. 1, the vertical axis represents the remaining amount of data in the buffer memory and the rotation speed of the spindle motor, and the horizontal axis represents time. 2 and 3, the same components as those of the prior art described with reference to FIGS. 6 and 7 are denoted by the same reference numerals, and description thereof is omitted.
[0017]
In short, the feature of the present invention is that when the linear velocity is switched in the zone CLV, even if the remaining amount of data in the buffer memory is almost full, the recording protection means is forcibly activated regardless of the remaining amount. To interrupt data writing.
That is, when the optical pickup 12 writing data arrives at the address A at which the linear velocity should be switched, the control means 28 issues a velocity switching instruction (time T1 in FIG. 1).
). In response to this switching instruction, the recording protection means 31 is forcibly activated, and the data writing is interrupted. As described above, since the recording protection means 31 operates independently of the remaining amount of data in the buffer memory 16, the operation of the recording protection means 31 may be performed when the address A for switching the speed is reached. It is not necessary to issue a switching instruction immediately before the address to be switched.
[0018]
Note that the write speed switching scheduled address A (boundary between zones) is calculated by a given calculation formula. Although this calculation formula is not described in detail here, it can be calculated by substituting a value specific to the optical disc, such as the track pitch of the optical disc, a linear velocity, and the like. The calculation formula is stored in a memory (not shown) included in the control unit 28 in advance.
That is, the calculation of the scheduled switching address is performed by using an OPC (Optimum Power Control), which is a data writing test, in a PCA (Power Calibration Area), which is a laser power calibration area located on the innermost circumference of the recording surface of the optical disc 10. At this time, the values such as the track pitch to be substituted into the calculation formula are measured. Therefore, these values are substituted into the calculation formula to calculate the scheduled switching address A to be switched. The calculated switching planned address A is stored in a memory (not shown).
[0019]
After the data writing is interrupted by the operation of the recording protection means 31, the optical pickup 12 is returned by a predetermined distance to synchronize the already written data with the data to be written next while increasing the linear velocity at the time of writing. To do.
When the already written data and the data to be written are synchronized, the data writing is restarted at the switched speed (time T2 in FIG. 1).
Here, comparing FIG. 1 with FIG. 8 described in the related art, the operation of the present invention is more effective in the time from when the speed switching instruction is issued to when the data writing is restarted (T2-T1 in FIG. 1). However, it is apparent that the time is reduced by the data storage time of the buffer memory (t3-t2 in FIG. 8).
[0020]
Next, the structure of the optical disk device will be described with reference to FIG.
The optical disk device 30 is a device that can write data on the optical disk 10 such as a CD-R or a CD-RW as an example of an optical disk. The optical disk 10 is mounted on a turntable provided on a rotation shaft of a spindle motor 22, and is rotated by driving the spindle motor 22.
[0021]
The rotation of the optical disk 10 by the spindle motor 22, the tracking servo of the optical pickup 12, the focus servo of the optical pickup 12, and the control of the feed mechanism 20 of the optical pickup 12 are controlled by servo control means 24 including a servo processor or the like.
[0022]
The optical disk device 30 is connected to a host computer 40 via a cable 41 via an input / output unit 26 including an interface such as SCSI or ATAPI.
The operation of the optical disk device 30 is started by inputting each command from the host computer 40. Normally, data to be written on the optical disk 10 is transferred from the host computer 40.
[0023]
Data to be written to the optical disk 10 transferred from the host computer 40 is temporarily stored in the buffer memory 16 via the input / output unit 26. A DRAM or the like having a capacity of about 4 MB is often used as the buffer memory 16.
A laser driver 14 for controlling a laser diode in the optical pickup 12 receives the data stored in the buffer memory 16 and writes the data on the optical disk 10.
[0024]
The control unit 28 includes a CPU, a memory, and the like, and controls the overall operation of the optical disc device 30 based on a control program stored in the memory in advance.
The control means 28 includes a recording protection means 31 (having a function called by a name such as burn proof or just link) having a function of interrupting data writing so that the optical disk is not wasted as a writing error when a buffer underrun occurs. ) Is connected. The recording protection unit 31 is an IC (LSI) having such a function.
The recording protection means 31 constantly checks the remaining amount of data in the buffer memory 16, and controls the servo control means 24 and the like so as to interrupt the writing when the data in the buffer memory 16 becomes less than a predetermined capacity.
[0025]
Even after the writing is interrupted, the recording protection means 31 checks the remaining amount of data in the buffer memory 16 and, when the data in the buffer memory 16 reaches a predetermined capacity, resumes writing the data. 24 etc. are controlled.
[0026]
The control means 28 is provided with a zone CLV control means 32. The zone CLV control means 32 controls the servo control means 24 so that the writing speed can be increased stepwise according to the position from the inner peripheral side of the optical disc 10 to perform data writing.
[0027]
Next, a method of switching the writing speed by the zone CLV will be described with reference to the flowchart of FIG.
In step S100, when data writing is started, the zone CLV control unit 32 constantly checks whether or not the optical pickup 12 has reached the scheduled speed switching address C stored in the memory.
When the zone CLV control unit 32 detects that the optical pickup 12 has reached the speed switching scheduled address C, the process proceeds to step S102, and the control unit 28 operates the recording protection unit 31. Then, in step S104, the recording protection unit 31 controls the servo control unit 24 and the like so as to temporarily suspend the data writing regardless of the remaining amount of data in the buffer memory 16.
[0028]
Then, in the next step S106, the zone CLV control means 32 moves the optical pickup 12 from the interrupted switching scheduled address A by a predetermined distance along the pre-groove x on which data has already been written on the optical disk 10 by the predetermined distance. The servo control means 24 is controlled so as to return to the side. Here, the predetermined distance is a distance at which the rotation of the spindle motor 22 disturbed after the jump is stabilized, and is not particularly limited to any particular value.
[0029]
Further, in the next step S108, the zone CLV control means 32 moves from the synchronization start address C where the optical pickup 12 is returned to the scheduled switching address A at the linear speed which is the speed to be written in the next zone. Then, the servo control means 24 is controlled so as to read the already written data.
At this time, an EFM signal is extracted from a signal read by the optical pickup 12 in an RF amplifier (not shown) and input to the control unit 28. Further, an EFM signal of data to be written is created in an encoder (not shown) and input to the control unit 28.
The control unit 28 synchronizes the read EFM signal with the optical disk by combining the internally generated EFM signal with the read EFM signal.
[0030]
In step S110, if the read EFM signal is synchronized with the internally generated EFM signal, the zone is changed from the scheduled switching address C so that data writing is resumed at a linear velocity higher than before the interruption. CLV control means 28 controls servo control means 24.
[0031]
In the present embodiment, the case where the linear velocity switching of the zone CLV is 16 × to 20 × to 24 × is described. However, the linear velocity switching is not limited to such numerical velocity. Further, the number of linear velocity zones in one optical disk is not limited to three.
[0032]
Although various preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and it is a matter of course that many modifications can be made without departing from the spirit of the invention. .
[0033]
【The invention's effect】
According to the writing speed switching method and the optical disk device in the optical disk device according to the present invention, when the linear velocity at the time of writing is to be switched, the recording protection means is switched regardless of the amount of data stored in the buffer memory at this time. Since the speed is switched by operating, the time from interrupting the data writing to switch the speed to increasing the speed and resuming the data writing can be shortened compared to the past, and the speed switching can be performed. Since the speed can be surely increased at the scheduled address and the rotational speed of the spindle motor can be accurately increased to the allowable rotational speed, the data writing time of the entire optical disc can be reduced.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram illustrating the principle of a linear velocity switching operation of an optical disc device according to the present invention.
FIG. 2 is an explanatory diagram of an optical disk recording surface for explaining an operation at the time of linear velocity switching.
FIG. 3 is an explanatory diagram of an optical disk recording surface for explaining an operation after writing is interrupted at the time of linear speed switching.
FIG. 4 is a block diagram illustrating an internal configuration of an optical disc device according to the present invention.
FIG. 5 is a flowchart illustrating a writing speed switching method according to the present invention.
FIG. 6 is an explanatory diagram of a recording surface of an optical disk for explaining an operation at the time of switching a linear velocity in the related art.
FIG. 7 is an explanatory diagram of an optical disk recording surface for explaining an operation after writing is interrupted at the time of conventional linear velocity switching.
FIG. 8 is an explanatory diagram illustrating the principle of a conventional linear velocity switching operation.
[Explanation of symbols]
2, 3, 4 Zone 10 Optical disk 12 Optical pickup 14 Laser driver 16 Buffer memory 22 Spindle motor 24 Servo control unit 26 Input / output unit 28 Control unit 30 Optical disk device 31 Recording protection unit 32 Control unit 40 Host computer 41 Cable x Pregroove

Claims (2)

Zone CLV control means for controlling to write data by gradually increasing the linear velocity at the time of writing toward the outer peripheral side of the optical disc;
Before writing data, check the remaining amount of data in the buffer memory that temporarily stores data, and if a buffer underrun occurs, suspend data writing until a predetermined amount or more of data is accumulated in the buffer memory. A write speed switching method in an optical disk device comprising a recording protection means for controlling,
When data writing arrives at the address where the writing speed should be switched,
Activating the recording protection means irrespective of the remaining amount of data in the buffer memory to temporarily suspend data writing,
A writing speed switching method characterized by switching the linear speed at the time of writing after the interruption and restarting data writing. Zone CLV control means for controlling to write data by gradually increasing the linear velocity at the time of writing toward the outer peripheral side of the optical disc;
Before writing data, check the remaining amount of data in the buffer memory that temporarily stores data, and if a buffer underrun occurs, suspend data writing until a predetermined amount or more of data is accumulated in the buffer memory. An optical disc device having a recording protection means for controlling
When data writing arrives at the address where the writing speed is to be switched, the recording protection means is activated regardless of the remaining amount of data in the buffer memory to temporarily suspend data writing, and after the interruption, the linear velocity at the time of writing is reduced. An optical disk device comprising: a control unit that controls switching to restart data writing.

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