JP2002319131A - Optical disk drive - Google Patents

Abstract

(57) [Problem] To provide an optical disc device capable of performing normal high-speed writing. SOLUTION: A CAV method or a ZCLV is provided on an optical disk.
In an optical disk device for writing information in a system,
A peak pulse superimposing means for superimposing a peak pulse on a recording pulse for writing information on the optical disc for a predetermined time;

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk apparatus for writing or reading information on an optical disk.

[0002]

2. Description of the Related Art In recent years, optical discs on which information can be written have been developed, and large-capacity information has been recorded, and recorded information has been read out and reproduced. As described above, when writing information to an optical disc, CLV
(Constant Linear Velocity) method, CAV (Constant Linear Velocity)
Information is written by an Angular Velocity (ZAngle Velocity) method, a ZCLV (Zone CLV) method, or the like.

In the CLV system, writing is performed while keeping the moving speed (linear velocity) of the optical disk with respect to the pickup for writing information constant, and writing by the pickup is performed on tracks on the inner peripheral portion of the optical disk. In such a case, the rotation speed of the optical disk is set to a high speed.
The information is always written with the linear velocity kept constant.

In the CAV method, information is written while the rotation of the optical disk is kept constant. The linear velocity at the time of writing information by the pickup is low in the inner peripheral portion of the optical disk.
High speed at the outer periphery.

In the ZCLV system, a recording track formed from the inner circumference to the outer circumference of the optical disk is divided into a plurality of zones, and the rotation speed of the optical disk in the divided zone becomes the outer zone similarly to the CLV system. Therefore, although the speed is low, the rotation speed of the optical disk at the time of writing information in each zone is rotated at a predetermined rotation speed to perform the CAV system writing.

The CLV method is suitable for increasing the recording density of information on an optical disk. However, the CLV method has a disadvantage that the rotation control of the optical disk must be controlled according to the information recording position of the optical disk, so that the rotation control becomes complicated. .

On the other hand, in the CAV method and the ZCLV method, the linear velocity at the outer peripheral portion of the optical disk is high. Can not be done.

[0008]

For this reason, conventionally, the time width of the recording pulse of the information to be recorded on the optical disk has been increased as the writing of the information on the optical disk becomes closer to the outer periphery. On the other hand, at the time of writing information to the optical disk, a wobble groove is formed on the optical disk. The groove wobble is read between recording pulses for recording information on the optical disk, and a synchronization signal at the time of writing is read. (Absolute Time In P)
regrove) signal.

However, as described above, if the time width of the recording pulse is made longer, the time for reading the wobble becomes shorter, and S
As a result, an error occurs in the ATIP signal due to a decrease in the / N ratio, so that a synchronization signal cannot be obtained and writing cannot be performed.

Particularly, this phenomenon often occurs when high-speed writing is performed. SUMMARY OF THE INVENTION It is an object of the present invention to provide an optical disk device in which high-speed writing can be normally performed.

[0011]

According to the first aspect of the present invention, there is provided an optical disk apparatus for writing information on an optical disk by a CAV method or a ZCLV method, wherein a recording pulse for writing information on the optical disk has a peak pulse for a predetermined time. And a peak pulse superimposing means for superimposing the peak pulse.

In the invention of claim 2, the power of the peak pulse superimposed by the peak pulse superimposing means is changed in accordance with the recording speed of writing information on the optical disk and the recording position of the optical disk.

According to a third aspect of the present invention, an ATER for detecting an error in an ATIP signal read from the optical disk.
A detection unit, wherein the peak pulse superimposing means
The power of the peak pulse is changed so that the error rate detected by the R detection unit is equal to or less than a predetermined value, and the time width of the recording pulse is also changed according to the change in the power of the peak pulse.

According to a fourth aspect of the present invention, when the sum of the power value of the superimposed peak pulse and the power value of the recording pulse reaches a predetermined maximum value, the peak pulse superimposing means outputs the time of the peak pulse. The width of the recording pulse is changed and the time width of the recording pulse is also changed in accordance with the change of the time width of the peak pulse.

According to a fifth aspect of the present invention, when the sum of the power value of the peak pulse and the power value of the recording pulse superimposed by the peak pulse superimposing means reaches a predetermined maximum value or the time of the peak pulse, When the width becomes equal to the time width of the recording pulse, the information on the optical disk is written by the CLV method.

According to a sixth aspect of the present invention, there is provided an ATER for detecting an error in an ATIP signal read from the optical disk.
A detecting unit, wherein the peak pulse superimposing means includes the AT
The time width of the peak pulse is changed so that the error rate detected by the ER detection unit is equal to or less than a predetermined value, and the time width of the recording pulse is also changed according to the change in the time width of the peak pulse.

According to a seventh aspect of the present invention, when the time width of the peak pulse superimposed by the peak pulse superimposing means becomes equal to the time width of the recording pulse, the writing of the information on the optical disk is performed by the CLV method. To include

In the invention according to claim 8, the time width of the peak pulse superimposed by the peak pulse superimposing means is made equal to the time width of the recording pulse. In the ninth aspect of the present invention, the power of the peak pulse superimposed by the peak pulse superimposing means is changed according to the recording speed at which information is written to the optical disk and the recording position of the optical disk.

According to a tenth aspect of the present invention, there is provided an ATE for detecting an error in an ATIP signal read from the optical disk.
R detection section, and the peak pulse superimposing means
The power of the peak pulse is changed so that the error rate detected by the ER detection unit is equal to or less than a predetermined value, and the time width of the recording pulse is also changed corresponding to the change in the power of the peak pulse.

According to the eleventh aspect of the present invention, when the sum of the power value of the peak pulse superimposed by the peak pulse superimposing means and the power value of the recording pulse reaches a predetermined maximum value, writing of information on the optical disk is performed. Is written by the CLV method.

[0021]

1 to 3 show an embodiment of the present invention.
This will be described with reference to FIG. FIG. 1 is a configuration diagram of an embodiment of the present invention,
FIGS. 2 and 3 are operation flowcharts of the first embodiment of the present invention.

FIG. 1 shows an optical disk apparatus showing a main part according to the present invention, wherein 1 is an optical disk, 2 is a motor for rotating the optical disk 1, 3 is a pickup for writing or reading information on or from the optical disk 1, and 4 is a pickup. 3 is an actuator for moving, 5 is a motor control unit, 6 is an optimum power determination unit, 7 is a peak power / width calculation unit, 8 is a laser beam control unit, 9 is an ATER detection unit, 10 is a data recording unit, and 11 is a control unit. Section, 12 to 14 are interfaces (I / O), 15
Is a processor (CPU) that performs processing.

Next, the operation of the first embodiment of the present invention will be described with reference to FIGS. In step S1, the recording instruction when it is transferred from the host device via the I / O 14, is recorded in a memory (not shown) the transferred recording speed V _n (n × speed) with the recording instruction.

In step S2, the control unit 11 positions the pickup 3 in the test area of the optical disk 1, and moves to step S3 to instruct the motor control unit 5 to rotate the motor at a predetermined speed CLV (or CAV). .

When the speed of the motor 3 reaches a predetermined speed in step S3, the process proceeds to step S4, where the optimum power determination unit 6 sets a test width T ₁ corresponding to the recording speed V ₁ (1 × speed),
Proceeds to step S5, instructs the different test pulses power values to the laser beam control unit 8 with respect to 15 blocks of the test area of unused test width T ₁ to perform recording write to the optical disc 1.

In step S6, the optimum power determining unit 6
Determines the optimum power P ₁ reads the information written on the optical disk 1 at the step S6. Optimum power P ₁ is the peak value P and the bottom value B of the read out from the 15 blocks of the test area RF signal, β = (P-B) / (P + B) ... (1) comprising computing the performed example beta = 0 .04 made to determine the write power as the optimum power P _1.

In step S7, the controller 11 controls the motor 2
Is rotated at a predetermined speed of the CAV, the process shifts to a step S8, the recording power is set P _n and the recording pulse width T _n with respect to the recording velocity V _n which is recorded in step S1.

Recording power P _n and recording pulse width T
_n is width T ₁ of the test pulses set in step S4, when the optimum power determined in step S6 and _{P 1, P n = P 1} (V n / V 1) 0.5 ... (2) T n = T ₁ (V ₁ / V _n ) (3) The following calculation is performed to set P _n and T _n .

The operations in steps S1 to S7 described above are the same as the operations performed when information is written on a conventional optical disk by the CAV method. Conventionally, the power P _n calculated by equation (2) is used.
And the pickup 3 for the time T _n calculated by the equation (3).
The optical disk 1 is made to write information by irradiating more light.

In the present invention, steps S9 to S13 described below are added. In step S9, the peak power / width calculation unit 7 calculates the peak power P _p of the pulse width T _p by the recording speed V recorded in step S1.
_n and the recording power at which the pickup 3 writes information on the optical disc 1, the peak power P _p is changed to superimpose the peak power P _p on the recording pulse set in step S 8, and the recording pulse width T _n is reduced by ΔT _n. Then, the process proceeds to step S10 to start writing information on the optical disk 1.

FIG. 4 shows recording pulses when writing information on the optical disk 1. FIG. 4 (A) shows the recording pulse set in step S8, the power P _n is outputted continuously for a predetermined time T _n, while the next write is performed to read the ATIP signal from the optical disk 1 The read power _Pr is output.

Since the above-described linear velocity is low at the innermost portion of the optical disk 1 where information is written to the optical disk 1, the position is set by the equations (2) and (3) shown in FIG. Information is written by the recording pulse.

[0033] However, writing position information of the optical disk 1 is moved toward the outer periphery of the optical disc, superimposes the T _p time P _r becomes peak pulse as shown in FIG. 4 (B), the time T _n of the recording pulse Is reduced by ΔT _n .

It should be noted P _r becomes power increases according to the write position is toward the outer periphery of the optical disk, the value of [Delta] T _n to reduce the time T _n of the recording pulse area of the recording pulses shown in FIG. 4 (B) increase equal as [Delta] T _n in the area of the recording pulse shown in FIG. 4 (a).

As described above, the peak pulse is superimposed on the recording pulse, so that even if the writing position moves toward the outer periphery of the optical disk, the heat accumulation effect of the laser beam is not reduced, and the information can be written accurately. Can be.

Also, since the time width of the recording pulse is reduced while the peak pulse is superimposed, the period for reading the ATIP signal from the optical disk becomes longer, the S / N ratio can be increased, and the synchronization signal can be reliably obtained. Can be obtained.

In step S11, the ATER detector 9
Reads the ATIP signal from the optical disk at the same time as writing the information to the optical disk, and proceeds to step S12, where the error rate of the ATIP signal obtained by reading is a predetermined value, for example, 1
It is determined whether it is 0% or less.

If it is determined in step S12 that the error rate is equal to or less than 10%, the process proceeds to step S9, where a peak pulse having the same value as before is superimposed on the recording pulse, and steps S9 to S1 are performed.
2 is repeated.

If it is determined in step S12 that the error rate is 10% or more, the process proceeds to step S13, where the peak power
Width calculating unit 7 decreases the width T _n of the recording pulse with increasing predetermined value the peak power P _p, the procedure proceeds to step S9, repeat steps S9 to S13, continues the writing of information onto the optical disc 1.

That is, as shown in FIG. 4B, the time T _p is the same, P _p is increased by a predetermined value, and ΔT _n is increased in accordance with the increase of P _p .

In this embodiment, the error rate of the ATIP signal is 1
At 0% or more, the power P _{p of the} peak pulse was increased. However, the power P _p of the peak pulse was kept constant, and the time width T _p of the peak pulse was changed as shown in FIG. You may make it increase. In the first embodiment, the writing of information to the optical disk is performed by the CAV method, but the writing may be performed by the ZCLV method.

Next, the operation of the second embodiment of the present invention will be described with reference to FIG. In the first embodiment, the power P _{p of the} peak pulse is increased when the error rate of the ATIP signal exceeds a predetermined value. However, the sum of the power P _{n of the} recording pulse and the power P _p of the peak pulse becomes a predetermined value P _max. Above this, the laser diode is broken, the laser output cannot be increased, and the writing of information on the optical disc is adversely affected. The second embodiment improves this.

In the second embodiment, FIGS.
Steps S1 to S13 of the first embodiment described above are executed. In step S20, the power P of the power P _p and the recording pulse peak pulse was increased in step S13
It is determined whether the sum of _n is greater than a predetermined value _Pmax ,
If the determination is lower than _Pmax , the process moves to step S9, and steps S9 to S13 and S20 are repeated.

[0044] proceeds to step S21 if it is determined that greater than P _max at step S20, the time width T _n of the recording pulse with increasing time width T _p of the peak pulse without increasing the power P _p of the peak pulse And step S
9 and repeat steps S9 to S13 and S20 and S21.

That is, the writing at the innermost portion of the optical disk is performed by the recording pulse shown in FIG. 6A, and the peak pulse is superimposed as the writing moves in the outer circumferential direction.
If the total power of the recording pulse and the peak pulse as shown in FIG. 6 (B) reaches P _max, as shown in FIG. 6 (C), the total value is set to P _max, the time width T _p of the peak pulse Are increased as shown by T _p ′ and ΔT _n is increased.

Next, the operation of the third embodiment of the present invention will be described with reference to FIG. The third embodiment replaces the second embodiment. Steps S1 to S13 of the first embodiment described with reference to FIGS. 2 and 3 and step S20 of the second embodiment described with reference to FIG. Be executed.

In the third embodiment, when it is determined in step S20 that the sum of the powers of the recording pulse and the peak pulse has reached the predetermined maximum value _Pmax , the process proceeds to step S30. Switching to the CLV system maintaining the same linear velocity as the velocity is performed, and the subsequent writing is performed.
And S30 are repeated.

Next, a fourth embodiment of the present invention will be described with reference to FIG. The fourth embodiment is an alternative to the second embodiment. Steps S1 to S13 of the first embodiment described in FIGS. 2 and 3 and steps S20 and S21 of the second embodiment described in FIG. Is executed.

In step S40, the weight in step S21 is
Time width T of folded peak pulse_pIs the time width of the recording pulse
T_n−ΔT_nIt is determined whether or not the_pIs T_n−
ΔT _nIf it is smaller, the process proceeds to step S9 and the second actual
Writing according to the embodiment is performed.

It is determined in step S40 that T _p > T _n -Δ
When it is determined that it is T _n , the process proceeds to step S41,
As described in the third embodiment, switching to the CLV method is performed and subsequent writing is performed.
9 to S13 and steps S20, 21, S40 and S41 are repeated.

[0051] Note that above time width T _p of the peak pulse in the embodiment described but were shorter than the time width T _n of the recording pulse, as shown in FIG. 9 (B), the time width of the peak pulse equal to the time width of the recording pulse, the time width T _n of the recording pulse may be shorter [Delta] T _n corresponding to the power value P _p of the peak pulse superimposed.

[0052]

As described above, since the peak pulse is superimposed on the recording pulse for writing information on the optical disk, information can be written reliably even when the linear velocity increases. Further, since the time width of the recording pulse is shortened while the peak pulse is superimposed, the ATIP signal can be obtained reliably.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention.

FIG. 2 is an operation flowchart of the first embodiment of the present invention.

FIG. 3 is an operation flowchart of the first embodiment of the present invention.

FIG. 4 is a diagram for explaining the first embodiment.

FIG. 5 is an operation flowchart of the second embodiment of the present invention.

FIG. 6 is a diagram for explaining a second embodiment.

FIG. 7 is an operation flowchart of the third embodiment of the present invention.

FIG. 8 is an operation flowchart of the fourth embodiment of the present invention.

FIG. 9 is a diagram for explaining another embodiment.

[Explanation of symbols]

 Reference Signs List 1 optical disk 2 motor 3 pickup 4 actuator 5 motor control unit 6 optimum power determination unit 7 peak power / width calculation unit 8 laser light control unit 9 ATER detection unit 10 data recording unit 11 control unit 12, 13, 14 interface (I / O) ) 15 Processor (CPU)

Claims (11)

[Claims] 1. An optical disk having a CAV method or a ZCLV
An optical disc apparatus for writing information in a system, comprising: a peak pulse superimposing means for superimposing a peak pulse for a predetermined time on a recording pulse for writing information on the optical disc. 2. The power of a peak pulse superimposed by said peak pulse superimposing means is changed in accordance with a recording speed of writing information on said optical disk and a recording position of said optical disk. An optical disk device as described in the above. 3. An ATER detecting section for detecting an error of an ATIP signal read from the optical disk, wherein the peak pulse superimposing means detects the error of the peak pulse so that an error rate detected by the ATER detecting section becomes a predetermined value or less. 3. The optical disk apparatus according to claim 1, wherein the power is changed and the time width of the recording pulse is changed in accordance with the change in the power of the peak pulse. 4. The peak pulse superimposing means changes the time width of the peak pulse when the sum of the power value of the superimposed peak pulse and the power value of the recording pulse reaches a predetermined maximum value. 4. The optical disk device according to claim 2, wherein the time width of the recording pulse is changed in accordance with the change in the time width of the pulse. 5. When the sum of the power value of the peak pulse and the power value of the recording pulse superimposed by the peak pulse superimposing means reaches a predetermined maximum value, or the time width of the peak pulse is equal to the recording pulse width. 5. The optical disk device according to claim 4, wherein when the time width becomes equal to the predetermined value, the information on the optical disk is written by the CLV method. 6. An ATER detecting section for detecting an error of an ATIP signal read from said optical disk, wherein said peak pulse superimposing means sets said peak pulse superimposing means so that an error rate detected by said ATER detecting section becomes a predetermined value or less. 3. The optical disk apparatus according to claim 1, wherein the time width of the pulse is changed, and the time width of the recording pulse is changed in accordance with the change in the time width of the peak pulse. 7. When the time width of the peak pulse superimposed by the peak pulse superimposing means becomes equal to the time width of the recording pulse, writing of information on the optical disk is performed by CLV.
7. The optical disk device according to claim 6, wherein writing is performed by a system. 8. The apparatus according to claim 1, wherein a time width of said peak pulse superimposed by said peak pulse superimposing means is made equal to a time width of said recording pulse.
An optical disk device as described in the above. 9. The apparatus according to claim 8, wherein the power of the peak pulse superimposed by said peak pulse superimposing means is changed in accordance with a recording speed for writing information on said optical disk and a recording position of said optical disk. An optical disk device as described in the above. 10. An ATIP read from the optical disk.
An ATER detection unit for detecting a signal error is provided, and the peak pulse superimposing means changes the power of the peak pulse so that the error rate detected by the ATER detection unit becomes a predetermined value or less, and changes the power of the peak pulse. 10. The optical disk device according to claim 8, wherein a time width of the recording pulse is also changed in accordance with the following. 11. When the sum of the power value of the peak pulse superimposed by the peak pulse superimposing means and the power value of the recording pulse reaches a predetermined maximum value, writing of information on the optical disk is performed in a CLV system. 11. The optical disk device according to claim 10, wherein the recording is performed.