JPH0845167A - Recording device for optical master plate and optical disk - Google Patents

Abstract

PURPOSE:To provide a recording device of optical master plate in which the increase of rotational jitter is not generated at the time of the changeover of a CLV recording and a CAV recording and the recording of a CAV area can be recorded synchronizing with a recording signal like an ordinary CAV exclusive disk. CONSTITUTION:A reference signal for a CLV generating part 21 generates a CLV reference signal fCLV for performing a recording with a constant linear velocity, a reference signal for a CAV generating part 22 generates a CAV reference signal for performing a recording with a constant angular velocity synchronizing with the reference clock of a recording signal. A control part 11 outputs a changeover signal 6 giving an instruction for changeover and a changeover part 20 changes over a reference signal to the reference signal set in the changeover signal at the instant when periods and phases of two reference signals are almost coincide with each other and then a rotary servo 12 is made to operated based on a selected reference signal. Thus, the increase of rotational jitter at the time of the changeover of reference signals is restrained.

Description

Detailed Description of the Invention

[0001]

The present invention relates to CLV (Consta).
nt Linear Velocity: constant linear velocity)
Area and CAV (Constant Angular V)
The present invention relates to a recording device and an optical disc for an optical disc master in which an eracity (constant angular velocity) area is mixed.

[0002]

2. Description of the Related Art Generally, as an information recording method for an optical disk, there are a CLV method with a constant linear velocity and a CAV method with a constant angular velocity. In the CLV method, the rotation motor is controlled so that the rotation speed is inversely proportional to the track radius of the optical disc, so that the linear velocity of the track for recording / reproducing becomes constant anywhere on the disc. FIG. 11 shows a part of an optical disc recorded by such a CLV method. Each track 1 is divided into a plurality of sectors, and a header 2 including a sync signal, an address signal and the like is located at the head of each sector. In this case, since the header interval or the sector length H on each track are all equal, there is an advantage that the recording density is the largest, but
Since the headers containing the sync signals are not aligned on the same radial line, the sync signals of adjacent tracks have an adverse effect, causing a so-called crosstalk phenomenon.

On the other hand, in the CAV method, the rotational speed of the rotary motor for rotating the optical disk may be constant, as shown in FIG.
As shown in FIG. 3, all the headers or sectors on each track are aligned on the same radial line, and the sector length becomes shorter toward the inner track. Therefore, since the headers including the synchronization signals are arranged on the same radial line, the crosstalk phenomenon is reduced and the access speed is relatively high.
Since the recording capacity per track is determined by the recordable capacity of the innermost track of the disc recording area, there is a drawback that the total storage capacity is reduced.

Therefore, a combined type optical disc master recording apparatus in which the inner side of the disc is a CLV recording area and the outer side is a CAV recording area by combining the advantages of the above two methods is disclosed in, for example, Japanese Examined Patent Publication No. 3-52148. It was disclosed in. FIG. 13 is a view showing a part of an optical disk master recorded by this recording apparatus. Since the outer peripheral side of the disk is a CAV area, the headers 2 are arranged in alignment on the same radius line, and the CLV method is switched from the middle. The inner circumference side of the track is the CLV area.

The structure of this recording apparatus will be described with reference to the block diagram shown in FIG. As shown in the figure, the surface of the optical disc master 3 is coated with a photosensitive material such as photoresist, and this is set on a rotary table rotated by a rotary motor 4. And this master 3
The light-sensitive material formed on the substrate is exposed to light emitted from a laser.

The laser light emitted from the laser source 5 is converted into modulated light by the optical modulator 6 according to the recording signal,
The surface of the master is irradiated with the light collected by the objective lens 7. The rotation state of the master is detected by a rotation detector 8 such as a rotary encoder, and the output from the oscillator 9 is frequency-divided by a variable frequency divider 10 at a predetermined ratio by a frequency division ratio command from the control unit 11 to perform servo control. Output the reference signal. Upon receiving this signal, the rotary servo 12 controls the rotary motor 4 with high accuracy so that the servo reference signal and the previous rotation detection signal are phase-synchronized.

On the other hand, the feed motor 13 controls the relative position of the laser beam, which is the information recording means, and the master 3 in the radial direction. The relative position is detected by the position detector 14 including a linear encoder and the detection information is fed back to the feed servo 15. A rotation detection signal is input to the feed servo 15, and the rotation of the feed motor 13 is controlled so that information is recorded at a predetermined track pitch according to the rotation of the master.

In both the CLV system recording and the CAV system recording, the reference signals of the rotary servo 12 and the feed servo 15 are generated based on a common reference clock from the oscillator 9. The recording position R in the radial direction on the master 3 and its angular velocity ω are detected by the linear velocity detector 16, and L =
The linear velocity L during recording is obtained from the relational expression of R · ω. When recording with the CLV method, the frequency division ratio is gradually changed so that the linear velocity L falls within a predetermined range, and
When switching from the V system to the CAV system, in CLV recording, the frequency division ratio is fixed at a predetermined recording position where the synchronization signals of sectors on the track are aligned on substantially the same radial line, and the master disc is kept constant. Rotate at angular velocity.

At a predetermined recording position where the sync signals (headers) on the tracks are aligned on substantially the same radius line, the circumference length with respect to the radius is adjusted so that the length l corresponds to the cycle of the sync signal F _V. It is necessary to satisfy the relationship that is a multiple, and therefore switching can be performed at the radius Rn that satisfies the relationship of the following expression. 2πRn = m · l 1 = L / f _V Therefore, Rn = m · L / f _V · l / (2π) where m is an integer value and L is a linear velocity. The value of the radius Rn is stored in the control unit 11 or is calculated, and the operation is switched from CLV recording to CAV recording.

[0010]

As described above, in the above-described conventional recording method, CLV recording and CAV recording are performed based on the common clock generated by the oscillator 9.
When switching from CLV recording to CAV recording or vice versa, there is an advantage that the rotation jitter of the master does not increase.

However, in the case of CAV recording, since the rotation of the master and the recording signal are not considered at all, the recording signal and the rotation of the master are not synchronized with each other. However, there is a problem that they are not aligned on the same radius line and are slightly displaced from each other.

Such a discrepancy in the arrangement of the sectors causes a recorded signal when a character such as an alphabet is recorded on a part of the disk master for security purposes so that it can be visually observed by the effect of optical interference by devising a signal. Since the master rotation is asynchronous, characters flow and become slanted, and in the worst case, this character is difficult to read. In particular, the frequency of this reference clock is unavoidably changed due to the temperature characteristics of the oscillator 9, and a fundamental solution is required.

The present invention focuses on the above problems,
The present invention was devised to effectively solve this problem, and its purpose is to prevent the increase of rotation jitter at the time of switching between CLV recording and CAV recording and to record the CAV area in the normal C format.
An object of the present invention is to provide a recording device and an optical disc for an optical disc master that can perform recording in synchronization with a recording signal similarly to an AV dedicated disc.

[0014]

In order to solve the above problems, the present invention provides a recording apparatus for an optical disc master in which a recording area having a constant linear velocity and a recording area having a constant angular velocity are mixed. A CLV reference signal generation unit for generating a master disk rotation control CLV reference signal for recording at a constant speed, and a master disk rotation control CAV reference signal for recording at a constant angular speed in synchronization with a reference clock of a recording signal. A CAV reference signal generation section, a control section for instructing switching between the CLV reference signal and the CAV reference signal, a switching section for switching the two reference signals in response to a switching signal from the control section, and this switching And a rotation servo that rotates the optical disc master based on a reference signal output from the unit, and the switching unit has substantially the same cycle and phase of the two reference signals. Those configured to switch the the moment the two reference signals.

[0015]

Since the present invention is constructed as described above, CLV
The reference signal generation unit for CLV generates the CLV reference signal so that the linear velocity is constant, and the reference signal generation unit for CAV generates the CAV reference signal so that the angular velocity is constant in synchronization with the reference signal of the recording signal.

Then, the control unit calculates a timing at which the timings of the two reference signals substantially match and outputs a switching signal, and the switching unit determines the cycle and phase of the two reference signals based on the switching signal. Both reference signals are selectively switched at the moment when they substantially coincide with each other. The rotary servo drives and controls the rotary motor for the optical disk master based on the reference signal selected by this switching. Therefore, CLV area and C
When the AV area is switched, the cycle and the phase of both reference signals substantially match, so that the rotation jitter of the optical disk master does not increase, and the synchronization signals of the sectors on the tracks in the CAV area are aligned on the same radial line. Can be arranged. Furthermore, by using such a recording device, it is possible to form an optical disc in which the CLV recording area and the CAV recording area are mixed.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a recording apparatus for an optical disk master and an optical disk according to the present invention will be described below in detail with reference to the accompanying drawings. 1 is a block diagram showing an example of a recording apparatus for an optical disc master according to the present invention, FIG. 2 is a circuit diagram showing a CLV reference signal generator, and FIG. 3 is a circuit diagram showing a CAV reference signal generator. FIG. 4 is a circuit configuration diagram showing the switching unit,
5 is a diagram showing a switching state between the CLV area and the CAV area on the optical disc master, FIG. 6 is a plan view of the optical disc master based on the state diagram shown in FIG. 5, and FIG. 7 is a timing showing waveforms of respective parts in FIG. It is a chart. The same parts as those of the device shown in FIG. 13 are designated by the same reference numerals.

As shown in the figure, in the recording device 17 for the optical disc master, the optical disc master 3 is set on a rotary table (not shown) rotated by a rotary motor 4.
A photosensitive material such as photoresist is applied to this surface. The recording signal source 18 outputs a recording modulation signal synchronized with a reference clock incorporated therein, and this signal modulates the laser light from the laser source 5 by the optical modulator 6 and outputs modulated light. The modulated light is reflected by the mirror 19 and then irradiated onto the surface of the master in a state of being condensed by the objective lens 7.

In the rotary servo 12, the servo reference signal generated from the rotary servo reference signal f _ref from the switching unit 20 described later and the rotation detection signal supplied from the rotation detector 8 of the rotary motor 4 are in phase with each other. The rotation of the rotary motor 4 is controlled with high precision so as to be synchronized.

The feed servo 15 feeds the rotation servo reference signal f _ref based on the rotation servo reference signal f _ref so that the feed servo reference signal and the rotation detection signal supplied from the rotation detector 23 of the feed motor 13 are in phase synchronization. The rotation of the motor 13 is controlled so that the modulated light is exposed on the master at a predetermined track pitch.

The CLV reference signal generation unit 21 outputs a master rotation control CLV reference signal f _CLV for recording at a constant linear velocity based on a clock from an oscillator 9 such as a crystal oscillator.

The CAV reference signal generation unit 22 outputs a master disk rotation control CAV reference signal f _CAV for recording at a constant angular velocity in synchronization with a reference clock from the EFM encoder or the like of the recording signal source 18.

The control unit 11 sets the linear velocity and the track pitch during recording, constantly monitors the recording position sent from the position detector 14, determines the recording area such as CLV / CAV, and switches the switching signal. It is output to the unit 20.

The switching unit 20 controls the control unit 2 at the moment when the phases of the rotation servo reference signals of CLV and CAV match.
Switching is performed according to the setting of the switching signal from 3.

FIG. 2 is a circuit diagram showing the CLV reference signal generator 21. The CLV reference signal is generated in proportion to the linear velocity L and in inverse proportion to the recording position R. That is, the generation unit 21 includes a CLV variable frequency divider 23 that variably divides the output signal f _X of the oscillator 9, a CLV variable frequency multiplier 24 that variably multiplies this output, and a fixed frequency divider 25. It is composed of Now, the number of pulses of the rotation detector 8 per one rotation of the rotation motor 4 is set as P, and the radius R of the recording position is set to BCD (Binary Coded Decode).
e) If the division ratio is 5 digits (the lowest digit is 1 μm) and the linear velocity L is the multiplication ratio of BCD 3 digits (the lowest digit is 0.01 m / s), the CLV reference signal f _CLV is generated as follows. To be done.
The reason why the fixed frequency divider 25 of 1/10 is inserted here is
This is because the operating frequency of the variable multiplication circuit is increased and stabilized.

F _CLV = f _X · (L × 10 ² ) / (R × 10 ⁶ ) · 1/10 [Hz] Here, f _X is determined by the following relational expression. f _X · (L × 10 ² ) / (R × 10 ⁶ ) · 1/10 = P · L / (2πR) f _X = P / (2π) × 10 ⁵ [Hz]

FIG. 3 is a circuit configuration diagram showing the CAV reference signal generator 22. As described above, the CAV reference signal synchronizes the recording signal and the rotation of the master disk with the recording signal source 1.
8 is generated based on the reference clock from the recording signal encoder. That is, the generation unit 22 includes a CAV multiplier 26 that variably multiplies the reference clock of the recording signal source, and a fixed frequency divider 27 that fixedly divides the output by 1 / N.
It is mainly configured by a CAV variable frequency divider 28 that variably frequency-divides this output. Assuming that the frequency of the reference clock is f _CLK , the sector frequency is f _S , the number of sectors per disk revolution is S, the multiplication ratio is M, and the division ratio is N, the CAV reference signal f _CAV can be calculated from the following relational expression. Is generated.

F _CAV = f _CLK · M / N · 1 / S [Hz] For example, when f _CLK = 44.1 KHz and f _S = 75 Hz,
M and N are determined by the following relational expressions. 44100 ・ M / N ・ 1 / S = 75 ・ P / S M / N = P / 588

FIG. 4 is a circuit configuration diagram showing the switching unit 20. This circuit takes an exclusive OR of the CAV reference signal and this signal passed through the delay element 29 in the EXOR circuit 30,
An AND circuit 31 takes the logical product of the output of the circuit 30 and the CAV reference signal. The output of the AND circuit 31 is input to the D terminal of the first latch circuit 32, and CK
The CLV reference signal is input to the terminal, and the output Q terminal is the CL of the first latch circuit 32 via the inverter 33.
Input to the R terminal.

The output of the Q terminal of the first latch circuit 32 is input to the CK terminal of the second latch circuit 34, and the switching signal from the control unit 11 is input to the D terminal. The Q terminal which is the output of the second latch circuit 34 is input to the data selector 35 so that the CAV reference signal and the CLV reference signal are selectively switched and either one is output as the rotation servo reference signal f _ref. It has become.

Next, the operation of this embodiment configured as described above will be described. First, the optical modulator 6 modulates the laser light based on the recording modulation signal S1 from the recording signal source 18 and outputs the modulated light S2. This modulated light S2 is condensed by the objective lens 7 and is recorded on the optical disc master. Will be exposed.

Here, the CAV reference signal generator 22 is
In order to perform CAV recording by synchronizing the recording signal with the rotation of the master, the CAV reference signal f serving as a servo reference signal is generated based on the reference clock S3 from the encoder of the recording signal source 18.
_CAV is generated, and the CLV reference signal generation unit 22 generates the CAV reference signal f _CLV based on the clock of the oscillator 9 for performing CLV recording.

The control unit 11 sets the linear velocity and the track pitch at the time of recording, constantly monitors the value of the radius R sent from the position detector 14 for the recording position of the master disc, and determines whether the recording area is CLV / CAV. The switch signal S6 is determined and output.
Then, the switching unit 20 switches according to the setting of the switching signal S6 of the control unit 23 at the moment when the cycle and the phase of the CLV reference signal and the CAV reference signal substantially match.

As shown in FIGS. 5 and 6, an optical disc master
For example, the innermost radial position R ₀ From linear velocity L₁ of
Performed by CLV recording (CLV1), and then hit the disk once
The CAV recording at the radial position R1 where the number of sectors S1 becomes
Then, CAV recording is performed (CAV1). Then before
Therefore, the set linear velocity of the CLV reference signal generator 21 is set to L₁Or
L₂ Change to. And the linear velocity is L₂ Become half
Radial position R₂ At linear velocity L₂ Switch to CLV recording for CL
V recording is performed (CLV2). After that, the reference signal for CAV
The division ratio of the generator 22 is S₁ To S₂ Change to (Fig.
3). Finally, the number of sectors per disk revolution is S₂ 
Radius position R₃ Switch to CAV recording with
R_Four CAV recording is performed up to (CAV2).

The predetermined recording position where the sectors on the track are aligned on the same radial line is the radial position R.
It is necessary for the circumference length to satisfy an integer multiple of one sector length, and thus CLV / CAV can be switched at a radius R _n that satisfies the following expression.

R _n = S · L / f _S · 1 / (2π)

Here, S is the number of sectors, L is the linear velocity, and f _S is the sector frequency. Radius R determined here
The value of _n is recorded in the control unit 11 in advance, or is calculated so that the switching operation from CLV recording to CAV recording or from CAV recording to CLV recording is performed as described above. .

The actual switching operation will be described with reference to the switching section shown in FIG. 4 and the timing chart shown in FIG. First, two asynchronous reference signals f _CLV , f
_{Of CAV} , reference signal f _CAV (FIG. 7B) and delay element 2
The EXOR circuit 30 takes the exclusive OR of the signal delayed by Δt in FIG. 9 (FIG. 7C), and outputs this output signal (FIG. 7C).
The logical product of (D)) and the reference signal f _CAV (FIG. 7 (B)) is taken by the AND circuit 31 to obtain the output shown in FIG. 7 (E). The output shown in FIG. 7E is output to the first latch circuit 3
At 2, the other reference signal f _CLV is latched at the rising timing.

When the phases of the two reference signals match, FIG.
The signal (F) has a pulse, and based on this pulse, the second latch circuit 34 switches the switching signal S6 from the control unit 11.
Content is latched, and the data selector 35 is switched based on this output (FIG. 7 (H)). Therefore, FIG. 7 (J)
Before point P, the CLV reference signal is output as the rotation servo reference signal shown in FIG. 7 (I), and after point P, the CAV reference signal is output.

Thus, one reference signal, eg f
_By converting _CAV into the pulse width of time t (FIG. 7D) and latching it at the rising edge of the other reference signal f _CLV , the phase of the CLV and CAV reference signals can be matched within the range of time t. It is possible to detect, and at the time of this coincidence, the rotation servo reference signal f _{ref is set} to CLV or CA according to the CLV or CAV mode preset by the control unit 11.
It is possible to switch to the V reference signal. Here, the pulse width t is determined by the delay time of the delay element, and the delay element can be configured by a logic element, and can be easily realized by connecting an integer number of inverters (NOT elements) in series, for example. .

The inverter 33 is provided for the following reason. For example, change from CLV to CAV and immediately C
When the rising pulse of the reference signal f _CLV falls within the pulse width t of FIG. 7 (E) when it should return to LV, the signal of FIG. 7 (F) remains at the high level and goes out from the time t. Becomes low level, and next time t enters, it becomes high level, so that the timing of returning to CLV is delayed. Therefore, in order to prevent this, the signal shown in FIG. 7 (F) is shortened by the inverter 33.

The switching between the two reference signals is asynchronous switching between the CLV reference signal and the CAV reference signal. At the position of the radius R _n where the cycles of the respective reference signals match, the control unit 23 controls CLV or CLV. The CAV mode is output to the switching unit 20 by the switching signal, and the switching unit 20 first detects the coincidence of the phases of the two reference signals with the control unit 1 first.
By switching according to the CLV or CAV mode set by 1, the disturbance of the reference signal can be eliminated when switching from CLV to CAV or from CAV to CLV. Therefore, the rotation control is not adversely affected and the rotation jitter is not increased.

Then, the optical disc master recording apparatus 17 configured as described above can produce an optical disc as shown in FIG. 10, for example. The information recording area of the optical disc 40 shown in FIG. 10 is composed of CLV recording areas 41 and 43 recorded at a constant linear velocity and CAV recording areas 42 and 44 recorded at a constant angular velocity. Then, in the CAV recording area 44 at the outermost periphery, for security purposes, the characters 45 such as alphabets are recorded so that they can be visually observed due to the effect of optical interference due to the devising of the signal. These characters 45 are recorded by utilizing the fact that the header or sector can be aligned and arranged on the same radial line by performing CAV recording. In the recording apparatus 17 for the optical disc master of the present embodiment, although the recording method records CLV and CAV in a mixed manner, there is no increase in rotation jitter when switching between CLV recording and CAV recording, and recording is performed with the optical disc master 3. Since it is possible to record in synchronization with the signal, it is possible to perform accurate recording without any inconvenience such as the recorded characters flowing and becoming skewed or difficult to read.

In the circuit structure shown in FIG. 4, one of the reference signals f _CAV is converted into a pulse width of time t, and the other reference signal f _{CLV is} latched to detect the phase matching. However, the present invention is not limited to this circuit configuration. For example, as shown in FIG. 8, similar delay elements 29A and EX for converting the other reference signal f _CLV into the pulse width of time t are also used.
The same output can be obtained by providing the OR circuit 30A and the AND circuit 31A and taking the logical product of the outputs from the AND circuits 31 and 31A by the AND circuit 36. A timing chart of the operation at this time is shown in FIG.
That is, when the phase of the output pulse of the AND circuit 31 shown in FIG. 9C and the phase of the pulse of the output of the AND circuit 31A shown in FIG. Switching between CLV and CAV may be performed based on the synchronization signal (FIG. 9E).

[0045]

As described above, according to the recording apparatus for the optical disk master of the present invention, the following excellent operational effects can be exhibited. It is possible to record on an optical disc master in which CLV / CAV recording is mixed, and since CAV recording is performed in synchronization with the reference clock of the recording signal,
Rotational jitter in the CAV region can be significantly suppressed. Since it is possible to switch from CLV recording to CAV recording or vice versa at the moment when the cycle and phase of each servo reference signal match, it is possible to reliably prevent the rotation jitter from increasing at the time of switching. .

[Brief description of drawings]

FIG. 1 is a block diagram showing an example of a recording apparatus for an optical disc master according to the present invention.

FIG. 2 is a circuit configuration diagram showing a CLV reference signal generator.

FIG. 3 is a circuit configuration diagram showing a CAV reference signal generator.

FIG. 4 is a circuit configuration diagram showing a switching unit.

FIG. 5 is a diagram showing a switching state between a CLV area and a CAV area on an optical disc master.

FIG. 6 is a plan view of an optical disc master based on the state diagram shown in FIG.

FIG. 7 is a timing chart showing the waveform of each part in FIG.

8 is a circuit configuration diagram showing a modified example of the switching unit shown in FIG.

FIG. 9 is a timing chart showing waveforms of respective parts in FIG.

10 is a plan view showing an optical disc manufactured using the recording device for the optical disc master shown in FIG. 1. FIG.

FIG. 11 is a partial view showing a part of an optical disc recorded by the CLV method.

FIG. 12 is a partial view showing a part of an optical disc recorded by the CAV method.

FIG. 13 is a partial view showing a part of an optical disc in which recording by the CLV system and recording by the CAV system coexist.

FIG. 14 is a circuit configuration diagram showing a conventional recording apparatus for an optical disc master.

[Explanation of symbols]

3 ... Optical disc master, 4 ... Rotation motor, 5 ... Laser light,
6 ... Optical modulator, 8 ... Rotation detector, 9 ... Oscillator, 11 ... Control part, 12 ... Rotation servo, 13 ... Feed motor, 14 ... Position detector, 15 ... Feed servo, 17 ... Recording device for optical disc master, 18 ... Recording signal source, 20 ... Switching unit, 21 ... C
LV reference signal generation unit, 22 ... CAV reference signal generation unit, 23 ... CLV variable frequency divider, 24 ... CLV variable frequency multiplier, 26 ... CAV variable frequency multiplier, 28 ... CAV variable frequency divider, 40 ... Optical disc, 41, 43 ... CLV recording area, 42, 44 ... CAV recording area, f _CAV ... CAV reference signal, f _CLV ... CLV reference signal, f _ref ... Rotation servo reference signal, S6 ... Switching signal.

Claims (3)

[Claims] 1. A CLV reference signal for master disc rotation control for recording at a constant linear velocity in an optical disc master recording apparatus in which a recording region having a constant linear velocity and a recording region having a constant angular velocity are mixed. A CLV reference signal generation unit, a CAV reference signal generation unit that generates a CAV reference signal for master rotation control for recording at a constant angular velocity in synchronization with a reference clock of a recording signal, the CLV reference signal, and the CAV reference A control unit for instructing signal switching, a switching unit for switching the two reference signals in response to a switching signal from the control unit, and a rotation for rotating the optical disc master based on the reference signal output from the switching unit. A servo, and the switching unit is configured to switch between the two reference signals at the moment when the cycles and phases of the two reference signals substantially match. And a recording device for an optical disc master. 2. The CLV reference signal generation unit has a frequency division ratio C which is an integral multiple of a recording radial position of the optical disc master.
Variable frequency divider for LV and C whose multiplication ratio is an integral multiple of linear velocity
2. The optical disk master recording apparatus according to claim 1, wherein the recording device for an optical disk master is configured by an LV variable multiplier, and the CAV reference signal generation unit is configured by a CAV multiplier and a CAV frequency divider. 3. A CLV recording area and a CAV using the recording device for an optical disk master according to claim 1 or 2.
An optical disc having a recording area mixedly formed.