JPH06314468A - Recording medium and copying machine - Google Patents

Abstract

PURPOSE:To perform a high speed copying in the good condition to a medium at the copying side with a multi-head system by relieving the burden at the master side and also to easily check it within the real time. CONSTITUTION:At the HA side of a recording head, the operation is made by a clock for encoding produced in a PLL circuit 60 by an ADIP signal detected in an ADIP detecting circuit 58A. At the HB side of the recording head, the operation is made by a fixed clock of a fixed clock circuit 72. Composite data are reproduced from the medium 51 at the master side of a master drive 50 and separated by a data separating circuit 53 to the data for inner periphery and outer periphery. The data for inner periphery are synchronized with an address of the ADIP by a buffer memory 52A and an encoder 54A and recorded on the inner peripheral area of an MD 10. The data for outer periphery are recorded on the outer peripheral area of the MD 10 by a buffer memory 52B and an encoder 54B at the timing of the fixed clock.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is a multi-head type M
The present invention relates to a copying system for copying data such as desired music software onto a recording medium such as a D (Mini Disc), and more specifically to improvements in a recording medium and a copying apparatus for recording data to be copied.

[0002]

[Prerequisite Technology] For example, when a small amount of a disc having the same content (for example, music) is duplicated using a recordable medium such as an MD, it is not mass duplication by a press such as an optical disc. , Duplication is performed by recording information. If the user owns a recordable disc and wants to purchase only the desired software information, put the disc on the copy device,
The soft information is copied by recording. These copies can be considered to be copies of RAM rather than copies of ROM.

Further, in the magneto-optical disk system, there is no high-speed transfer system for copying the soft information directly from the master tape like the video tape. Therefore, the signal of the soft information is reproduced from the master tape, and this is reproduced on the magneto-optical disk. A copy form of recording in a one-to-one correspondence is adopted.

The present invention relates to a speed-up system for copying in such a case, and more particularly to a method of storing data to be copied in a master side medium in the case of copying in a multi-head system and an improvement of the copying method. It is a thing.

It is desirable that the time required to copy the data from the medium on the master side to the medium on the copying side by the copying apparatus to produce a copying medium having the same contents as the medium on the master side is efficient and short. However, when the master side medium is reproduced and the reproduced data is copied to the copy side medium, the reproduction speed of the data on the master side medium generally determines the upper limit of the high speed copying magnification. This upper limit is currently about 5 times. This is because there is a limit due to the control frequency band of the drive servo system for the head and the medium on the master side and the copy side, and a limit due to the frequency band of the circuit system.

FIG. 8 shows the permissible values of surface wobbling and eccentricity during normal driving, that is, in a constant velocity MD, and the limit frequency range in which the servo system can follow up. For example, in the surface runout, out of the range where the control frequency of the servo system is 500 Hz or less, the surface runout is within ± 0.3 mm up to 29 Hz, and the maximum acceleration is 10 m /
Each of the servo target values is s ² . Also, at 500 Hz or higher, the deviation is ± 1.
The servo target value is μm.

Similarly, in the eccentricity, of the control frequency of the servo system of 500 Hz or less, up to 71.2 Hz, the eccentricity is ± 50 μm, 71.2 Hz.
In the above description, the maximum acceleration is 1 m / s ² , which is the servo target value. At 500 Hz or higher, the servo target value is that the noise is ± 0.03 μm.

On the premise of such characteristics, when the high-speed driving at 5 times speed is performed, the result is as shown in FIG. As shown in the figure, each servo target value and frequency value are approximately 5 times,
The maximum acceleration is 5 ² times, and the values of surface wobbling and eccentricity are the same as in the case of constant velocity. The characteristics required for good copying against such surface wobbling and eccentricity characteristics are as follows:
The graphs GA and GB are shown in FIG.

The above relationship applies to the case where the MD on the copying side has one recording head or pickup. Therefore,
In order to perform copying in a shorter time, it is necessary to adopt the multi-head method using a plurality of pickups.

However, in the case of a disc in which signals are recorded by CLV (constant linear velocity) control such as MD, if there are a plurality of pickups, there arises a problem of the number of rotations of each pickup. For example, it is assumed that the recording area of the disc is divided into two parts on the inner circumference side and the outer circumference side. If CLV control is performed for one of the areas, the data transfer rate is constant in that area. However, in the other area, the rotation speed is different from the normal value, and therefore the linear velocity is not constant with respect to the pickup. Therefore, it becomes necessary to make the data transfer rate variable. As described above, when data is recorded in a plurality of areas at the same time, a signal source matching the data transfer rate in each area is required.

In MD, ADIP (Adress In Pre-groov) is used to control the rotation and CLV of the disc.
A control signal called "e On Recordable Disc" is recorded at 22.05 KHz in the form of a groove wobble (oscillation), and is an address that reproduces this and positions the CLV synchronization signal and the recording signal. Is played. Therefore, CLV
In the control area, data may be recorded along the ADIP signal at a substantially constant transfer rate. In other areas, AD with a frequency different from the normal frequency is used.
It is only necessary to reproduce the IP signal, generate an encoder clock synchronized with the IP signal, and record the data by a method of driving the recording encoder with a variable clock.

As such a method, Japanese Patent Application No. 2-29 is used.
Some patents have been filed as No. 3170 and Japanese Patent Application No. 2-324682. Japanese Patent Application No. 2-293170 discloses that when a disk having a constant linear velocity format is recorded at a high speed by a plurality of recording means, one is CLV controlled and the other is encoded by a variable clock proportional to the linear velocity. A disk recording / reproducing system has been disclosed. In Japanese Patent Application No. 2-324682, a bit clock is generated by a PLL for a reproduction signal of a pre-groove when high speed recording is similarly performed by a plurality of recording means. There is disclosed a disc recording method. In the present invention, data recording is performed on the copy medium side by such a method.

[0013]

2. Description of the Related Art By the way, a plurality of such systems, for example, 2
As for the master side device of the multi-head system copying system, it is conceivable that the reproducing device has two reproducing channels as in the copying side. For example, Japanese Patent Application Laid-Open No. 2-258594 discloses a disc recording method in which an encoder disc is mounted concentrically with a recording disc to generate an encoder clock for recording, and the reproducing side thereof is a plurality of pickups. There is.

Next, when the disk is duplicated by a recording operation such as high speed copying, it is necessary to monitor whether or not the recorded state is good. In terms of time saving, it is preferable to monitor the data at the same time as recording. But,
In order to perform simultaneous monitoring, a monitor pickup is required in addition to the recording pickup. However, such a method increases the cost of the device. Therefore, for a tape or the like in which data is copied by high-speed copying, the copy quality is checked by confirming a test signal recorded in a specific area after the recording is completed.

[0015]

However, the above conventional techniques have the following disadvantages. (1) If multiple pickups are used on the master side (playback side), a servo system and a signal system for control are required for each pickup, and the drive control of these pickups becomes complicated, resulting in reliability and maintenance. Is not preferable. In addition, there is a problem of device cost and whether or not each pickup can obtain a reproduction characteristic of the same quality (characteristic compatibility).

(2) In addition, it takes time to check the copy quality, and it is troublesome because the test signal must be recorded. The present invention focuses on these points, and provides a recording medium and a copying apparatus that can reduce the load on the master side and can perform high-speed copying favorably by the multi-head method, and can easily perform the check. The purpose is to provide.

[0017]

In order to achieve the above-mentioned object, the invention of a first recording medium is such that data to be copied by a multi-head method is divided into divided areas of a copying side medium, and a data transfer rate in each divided area is set. It is characterized in that it is recorded in combination with one-channel data based on the summed maximum transfer rate.

A second aspect of the present invention is a copying apparatus which reproduces data from the recording medium and records the data in each divided area of the copying side medium by a multi-head method, wherein the composite data reproduced at high speed from the recording medium is reproduced. Data separation means for separating the data for each divided area of the copy side medium, and recording means for recording the data separated by this in the corresponding divided area. A third invention is characterized in that, in the copying apparatus, any one of the recording means performs a reproducing operation at an overlapping portion of the divided areas.

[0019]

According to the present invention, the recording medium on the master side becomes a signal source of one system. The master side medium is driven at a higher speed than the copying side medium, that is, at a higher data transfer rate. The composite data reproduced by this is separated for each divided area of the copy side medium and supplied to the corresponding recording means. Data is copied to each divided area at each transfer rate. In addition, the copied data is reproduced at the overlapping portion of each divided area, whereby the recorded data is monitored in real time.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a recording medium and a copying apparatus according to the present invention will be described in detail below with reference to the accompanying drawings. <Basic copy system of 1 head system> First, referring to FIG.
Also, a one-head type copying system will be described with reference to FIG. As described above, the present invention is premised on the multi-head system on the recording side. However, in order to facilitate understanding, first, referring to FIG. 3, for a copying system having one head on the recording side, refer to FIG. While explaining.

The driver on the copying side is mainly a servo system and an ADI.
It is composed of a P demodulation system and a recording signal system. The MD 10 which is the copy side medium is set on a clamper 14 which is rotationally driven by a spindle motor 12. An optical pickup 18 driven by a feed motor 16
The output side of is connected to the RF amplifier 20. The optical pickup 18 includes a semiconductor laser and its drive circuit, and the light output from the semiconductor laser is focused on the MD 10 as a submicron spot. The servo output side of the servo circuit 22 is connected to the spindle motor 12, the feed motor 16, and the optical pickup 18, respectively. The RF amplifier 20 has A
The DIP demodulation circuit 24 is connected.

On the other hand, the recording head 26 for recording data by the magnetic field modulation recording system has a magnetic field drive amplifier 28.
Is connected to the magnetic field drive amplifier 28.
An O (First In First Out) memory 30 is connected. Further, in the servo circuit 22 and the FIFO memory 30,
A CPU 32 for controlling the overall operation is connected. The demodulation output side of the ADIP demodulation circuit 24 and the CPU 32 are connected to the control side of the data source 34 of the master side driver such as a CD player, and the FIF is connected to the data output side.
The O memory 30 is connected.

Of these, the RF amplifier 20 amplifies the signal detected by the optical pickup 18 and ADI.
The optical pickup 1 outputs to the P demodulation circuit 24.
8 to give feedback to control the optical output [APC]
Further, it has a function [servo error] of outputting the servo error signal obtained from the detection signal of the optical pickup 18 to the servo circuit 22. The servo circuit 22 is based on the input servo error signal and the instruction from the CPU 32.
The focus [FOC] and tracking [TRC] in the optical pickup 18 are controlled, and the drive control [SPI] of the spindle motor 12 and the feed motor 16 is performed.
N] and [FEED], respectively.

The ADIP demodulation circuit 24 is for demodulating ADIP from the detection signal of the optical pickup 18. The FIFO memory 30 has a function as a buffer for supplying the data to be copied supplied from the data source 34 to the recording head 26 side.

Next, the operation of such a copying system will be described. As described above, the data of the MD 10 is managed by the address of the ADIP data recorded by the wobble of the groove, that is, the sector data and the cluster data. Therefore, the copy data is the ADIP
The data is controlled according to the data and recorded on the MD 10.

Therefore, during the copy recording operation, the ADIP demodulation circuit 24 performs AD conversion from the output signal of the RF amplifier 20.
The IP data is decrypted and provided to the data source 34. Data to be copied is output from the data source 34 in synchronization with ADIP.
0, supplied to the recording head 26 via the magnetic field drive amplifier 28. On the other hand, in the servo system, the above-mentioned CLV control of the optical pickup 18 and the recording head 26 is performed. As a result, the data to be copied and the address are synchronized and M
Data will be recorded at a predetermined position of D10.
As a method for synchronizing the data to be recorded and the ADIP at this time, there are a method of controlling the rotation of the MD 10 and encoding with a constant clock, and a method of generating an encode clock from the ADIP.

<Multi-Head Type Copy System of the Present Embodiment> Next, the configuration of the multi-head type copy system according to the present embodiment will be described with reference to FIG. In this embodiment, the number of pickups on the copy side driver is two.
It has become one.

When performing high-speed copying of about 5 times, the recording head and servo system are the main problems. As for the follow-up characteristic of the servo system, a frequency band of 700 Hz or higher is required when the disk has a constant speed. A follow-up band of 4.7 KHz is required to perform follow-up control at 5 times speed. But,
When the high frequency transmission characteristic of the actuator often has secondary resonance and the amplitude characteristic Q is high, when the servo system is made high frequency, high frequency oscillation is caused and stable servo characteristics cannot be obtained ( (See FIG. 9).

Therefore, in this embodiment, a plurality of pickups are used. In addition, even in the above-mentioned patent application, there are two advantages in that it has a plurality of pickup configurations.
It has been pointed out that there are two cases, and about two is preferable from the viewpoint of the cost of the apparatus.

In the following description, among the components common to the two pickup systems of the copy side driver, "A" is attached to the component of one pickup system and "B" is attached to the component of the other pickup system. I will.

In FIG. 4, the output side of the master side driver 50 is connected to the buffer memories 52A and 52B, respectively. The output sides of these buffer memories 52A and 52B are connected to encoders 54A and 54B, respectively, and the output sides of these encoders 54A and 54B are P
The U (pickup) drivers 56A and 56B are respectively connected. Output sides of these PU drivers 56A and 56B are connected to pickup units PUA and PUB and recording heads HA and HB, respectively. Also,
Output side of each pickup unit PUA, PUB is AD
They are connected to the IP detection circuits 58A and 58B, respectively.

Next, of the A and B channels, CLV
On the A channel side where control is not performed, the output side of the ADIP detection circuit 58A is the buffer memory 52A, ADIP.
Each is connected to the PLL circuit 60. ADIP
The PLL circuit 60 includes a phase comparison circuit 62, LPF 64, V
The CO 66 and the frequency dividing circuit 68 form a closed loop, and the output side of the ADIP detection circuit 58A is connected to the input side of the phase comparison circuit 62. Further, the output side of the VCO 66 is connected to the encoder 54A.

On the other hand, on the B channel side where CLV control is performed, the output side of the ADIP detection circuit 58B is connected to the buffer memory 52B and the spindle control circuit 70, respectively, and the output side of this spindle control circuit 70 is connected to the spindle motor 12. Has been done. A fixed clock circuit 72 is connected to the encoder 54B.

<Structures of Recording Heads HA and HB> Next, of the structures shown in FIG. 4, the recording heads HA and HB for magnetic field modulation will be described in more detail. In the MD, a magnetic field modulation method is used for recording data, and the recording heads HA, HB
Data recording is performed by switching the signal (current direction). Recording head HA, H
The switching time of B is about 200 ns at maximum.

By the way, there are two types of recording heads HA and HB, a sliding type and a floating type. Comparing these, first, in a normal sliding type recording head, the inductance is about 5.8 μH at 1 MHz. The sliding type recording head slides on the disk surface, and control is performed to separate the head from the disk surface by a predetermined distance by a preceding sliding portion (not shown). The suspension of the recording head (not shown) due to the spring absorbs the influence of surface deflection of the disk.

In a normal MD, the linear velocity is 1.2 m / s, but when driven at 5 times speed for high-speed copying, the surface wobbling acceleration becomes high as shown in FIG. Therefore, it is necessary to increase the followability, but for this purpose, it is necessary to increase the pressing pressure of the sliding head. However, there is a realization problem that the spindle motor 12 is burdened by an increase in frictional force due to the sliding between the head and the disk.

On the other hand, since the inductance of the flying type recording head is about 1 μH at 1 MHz, it is easy to obtain 20 n.
Switching can be performed for a time of about s, and there is no inconvenience in the reversal speed of the magnetic field even if high-speed copying is performed. However, in this levitation type, since it is a fluid levitation by air,
The shape and size of the slider (not shown) and the relative linear velocity pose a problem. When the linear velocity is low, the flying height of the recording head decreases, and the surface acceleration of the disk may cause collision. On the contrary, in order to obtain good magnetic characteristics, it is necessary to control the floating distance to about 5 μm from the disk surface, for example. Therefore, it is necessary to consider the allowance from the magnetic viewpoint and the allowance from the mechanical viewpoint.

The flying height of the head is 3 times the width of the slider.
It is proportional to the / 2 power and to the 1/2 power of the linear velocity. That is, the flying height ΔH is determined by the linear velocity v, the slider width a, and the load w.
On the other hand, the following equation is obtained. ΔH∝√ {(v × a ³ ) / w} ………… (1)

Next, when the flying type recording head is used, the flatness of the disk is required, but the area which is the flat surface is limited due to the structure of the disk. In FIG. 5A, M
A cross section of D10 is shown. In the figure, the substrate 10
On A, a recording film 10B made of MO, a reflective film 10C, and a protective film 10D for protecting the recording film 10B from oxidation are laminated and formed.

Of these, the protective film 10D is the recording film 10B because it is necessary to shield the internal recording film 10B from the outside air.
The whole shape is covered and the edges are raised because it is formed by spin coating. Therefore, the disk surface is not flat in this portion.

Next, the mechanical dimensions will be examined assuming that the protective film 10D is ideally formed. First, the recording film 1
When the recording head traces the outermost peripheral side of the information area in which 0B is formed, the position 1 mm outside the outermost peripheral track is the floating limit where the reflective film 10C exists, as shown in FIG. Therefore, as shown in FIG.
It is necessary to provide the recording head H at a position 1 mm from the outside of the slider of the recording head. On the other hand, when the recording head traces the innermost circumference side of the information area where the recording film 10B is formed, as shown in FIG.
The position on the inner side of 5 mm is the limit at which the reflecting film 10C can be floated. Therefore, it is necessary to provide the recording head H at a position 3.5 mm from the inside of the slider of the recording head as shown in FIG.

For these reasons, the innermost circumference and the outermost circumference are set to 1
The width of the slider when tracing with one recording head is
The maximum is 4.5 mm, which is the sum of 1 mm outside and 3.5 mm inside. However, with such a width,
It is difficult to secure a flying height of m.

On the other hand, if dedicated recording heads are provided in the outer and inner regions, respectively, the limitation on the width of the slider is alleviated, and only one of the dimensional limits shown in FIGS. Will be satisfied. That is, for the slider of the recording head on the outer peripheral side, only the condition that the outer side is 1 mm is satisfied, and the inner side may be any number. As for the slider of the recording head on the inner peripheral side, only the condition that the inner side is 3.5 mm is satisfied, and the outer side may be any number. In this embodiment, as described above, the two recording heads HA and HB on the copy driver side are provided.
Are respectively assigned to the inner peripheral side area and the outer peripheral side area of the MD 10.

<Division of Recording Area and CLV Control> Next, in the present embodiment, the recording area in the MD 10 is divided into two corresponding to the use of two recording heads as described above. That is, the area of R (radius) = 16 mm to 30.5 mm, which is the recording area of the MD 10, is divided into an inner peripheral area and an outer peripheral area at R = 23 mm, which is approximately the middle.

In MD, signals are recorded by CLV control. When the recording area is divided into two, the inner peripheral area is CLV controlled and the outer peripheral area is CLV.
There are two control methods for controlling. At this time, for example, if CLV control is performed on the outer peripheral area and recording is performed, the inner peripheral area does not have a constant linear velocity. Therefore, a clock proportional to the linear velocity is generated so that recording is performed simultaneously with the outer peripheral side.

The temporal changes in the radial position of the recording head in these two control systems are shown in FIGS. 6 (A) and 7 (A), respectively. FIG. 6 shows the case of the outer circumference CLV system, and FIG. 7 shows the case of the inner circumference CLV system. The disc speed is a normal reading speed and the linear velocity is 1.2 m / s.

In these cases, since the tracks on the MD 10 are spiral, the recording heads HA and HB move in the radial direction by one track pitch per revolution. For this reason, the radius of the head position increases with time in proportion to the amount of rotation, and this is the same for the inner circumference and the outer circumference. Therefore, the change in radius of the inner circumference side head and the change in radius of the outer circumference side head with respect to time only change with a constant difference. Further, the moving distance in the radial direction is also the same.

For this reason, when the recording area is divided into two areas, it is convenient to set the middle point of the inner and outer diameters as the branch point. In the case of MD, the intermediate point is 23.25 mm, but in the present embodiment, it is set to 23 mm in consideration of the margin at the recording connection position. Therefore, FIGS.
In each case, the position with the radius of 23 mm passes before reaching the outermost diameter position of each recording head.

<Data transfer rate when CLV control is performed> Next, the outer circumference CLV or the inner circumference CL as described above.
A data transfer rate when V is controlled to record data on the MD 10 will be described. In FIG. 6 (B),
The change of the linear velocity of each recording head with respect to the time when the outer circumference CLV control is performed is shown. In this case, since the outer peripheral head is CLV controlled at a constant velocity of 1.2 m / s, the linear velocity in this outer peripheral region is normalized and expressed as 1. In this case, on the inner peripheral side, the rotational speed is equal to or lower than the normal value, and thus the linear velocity is 1 or lower. Initially, the linear velocity on the inner peripheral side is about 0.7 times, but increases with time and finally becomes about 0.77 times.

FIG. 7B shows changes in the linear velocity of each recording head with respect to time when the inner circumference CLV control is performed. In this case, the inner peripheral head is CLV controlled at a constant velocity of 1.2 m / s, so the linear velocity in this inner peripheral region is normalized and expressed as 1. In this case, on the outer peripheral side, the rotational speed is equal to or higher than the regular value, and thus the linear velocity is 1 or higher. Initially, the linear velocity is about 1.4 times, but decreases with the passage of time, and finally becomes about 1.3 times.

The linear velocity of each of these heads is proportional to the data transfer rate, and data is supplied from the master side in accordance with the linear velocity of each head shown in the figure.
By the way, FIG. 6 (B) and FIG. 7 (B) also show the total linear velocities in the inner and outer regions. When copying and recording data with two recording heads, assuming that the master side is one channel, the data required for recording is a combination of data corresponding to the transfer rate on the outer circumference side and data on the transfer rate on the inner circumference side. Things need to be supplied from the master side. In this embodiment, such composite data is recorded on the recording medium on the master side, and this is reproduced by the 1-head method.

The detailed numerical values of the graphs of FIGS. 6 and 7 are shown in Tables 1 and 2 below.

[0053]

[Table 1]

[0054]

[Table 2]

Next, the data transfer rate on the master side will be described. Assuming that a driver capable of high-speed CD reproduction is used as the master driver 50,
It is desirable that the transfer rate of the master data be constant and continuous. For this reason, in the present embodiment, the data transfer rate on the master side is set in correspondence with the maximum value of the sum of the data transfer rates corresponding to the linear velocity ratios of the inner and outer circumferences. Then, the master data is created in accordance with the data transfer rates of the two recording heads for performing the multi-area simultaneous recording.

For example, if the total copying magnification is 5 times, the above 2
The following table 3 shows the real linear velocity and the real transfer rate in the CLV control method. When the data is read from the recording area of the MD 10 (spiral with a radius of 16 to 30.5 mm and a pitch of 1.6 μm) at a normal speed of 1.2 m / s, the reproduction time is 1102 seconds. Therefore, 5
At double speed, it is one fifth, 220 seconds.

[0057]

[Table 3]

As shown in this table, the constant velocity recording time is simply half of 1102 seconds because of the 2-head system, but 660 in the case of the outer peripheral CLV system because of CLV control.
Seconds, 510 seconds in the case of the inner circumference CLV method. Next, the basic magnification for recording is 5 times for the two heads as a whole, but considering the magnification for each head, they are 3 times and 2.31 times, respectively. Further, the speed ratio of each head, that is, the speed ratio in the normal case and the sum thereof are shown in the same table.

From these results, in the case of the peripheral CLV control, the high speed magnification can be secured in total without increasing the magnification of each head, which is efficient and convenient. On the other hand, in the case of the inner circumference CLV control, the maximum magnification of the outer circumference side head is close to 4 times, and the total magnification is also high. However, since the inner peripheral head having a low linear velocity has a constant linear velocity and the linear velocity can be increased, the flying head can be highly floated, which is convenient.

<Creation of Data on Master Side Medium> Next, a master side medium in which data to be copied is recorded in consideration of the above relationships will be described. The data transfer rate is
It has a proportional relationship with the linear velocities of the two recording heads HA and HB, which can be examined from the above-mentioned linear velocity relationship. In the present embodiment, since the master side driver 50 has one channel, the master side driver 5 is the sum of the transfer rates requested by the recording heads HA and HB, that is, the sum of the linear velocities.
It is necessary to transfer and output data from 0.

However, as apparent from the graphs of the total linear velocities shown in FIGS. 6 and 7B or the specific values of the total linear velocities shown in Tables 1 and 2. ,
The total value changes depending on the head position. For this reason,
If data is to be transferred from the master side to the copying side in response to a change in linear velocity, drive control on the master side becomes very complicated.

Therefore, in this embodiment, the data is transferred to the copying side at a constant transfer rate corresponding to the maximum value of the total linear velocities, and when the total linear velocity is smaller than the maximum value, a predetermined amount is transferred. Blank data is added to each item of data.

First, referring to FIG. 1, the data creation of the master side medium in the case of the outer circumference CLV system will be described. Recording on the outer peripheral area is started at a position with a radius of 23 mm of the MD 10, and at the same time, recording on the inner peripheral area is started from the innermost peripheral diameter position. In this method, the total linear velocity ratio at the start, that is, the transfer rate is 1 + 0.7 = 1.7 in total (see FIG. 6 (B), Table 1). On the other hand, at the end of recording, the sum of the linear velocity ratio at the position of the radius of 23 mm on the inner side and the linear velocity at the position of 30.5 mm on the outer side is 1+.
0.77 = 1.77. That is, the total maximum transfer rate is 1.77.

FIG. 1 shows a data array on the master side medium in the case of the outer peripheral CLV system. Same figure (A)
Shows all the data to be copied, and is divided into data DA and DB at the position of the recording start radius R = 23 mm. The data DA is data to be copied and recorded in the inner divided area A of the MD 10 shown in FIG. 7B, and the data DB is data to be copied and recorded in the outer divided area B. The data DB has a data amount about 1.5 times that of the data DA.

Here, in this example, since the outer circumference is CLV, the linear velocity is constant in the outer circumference region B, and therefore the transfer rate of the data DB is constant. On the other hand, the transfer rate of the data DA is variable, but in order to keep this constant, the maximum transfer rate is set to 0.77 as a reference, and blank data is added to the portion of the transfer rate that is less than that to add the maximum transfer rate. The amount of data corresponds to 0.77.

The state is shown in FIG.
This is enlarged and shown in FIG. Blank data BA1 of 0.07 (more accurately 0.075) is added to the first data DA1 of 0.7 (more accurately 0.695) to obtain data of a transfer rate of 0.77 as a whole. To be The same applies to the following data. The blank data BA gradually decreases and is not added to the last data.

On the other hand, the data DB on the outer peripheral side has a constant transfer rate of 1. Therefore, when it is shown in correspondence with FIG. 6D, data having a predetermined number of bits as shown in FIG. Become. In the master side medium 51 such as a CD shown in FIG. 7G, the inner circumference data shown in FIG. 7D and the outer circumference data shown in FIG. The data are arranged alternately and stored as shown in FIG. That is, the data DA adjusted to the maximum transfer rate of 0.77 by adding the blank data BA and the data DB of the transfer rate 1 are alternately arranged, and the data is configured at the transfer rate of the total transfer rate 1.77. Has been done. This is the master medium 51
It is stored in.

Next, referring to FIG. 2, the data creation of the master side medium in the case of the inner circumference CLV system will be described. Recording on the outer peripheral area is started at a position with a radius of 23 mm of the MD 10, and at the same time, recording on the inner peripheral area is started from the innermost peripheral diameter position. In this method, the total linear velocity ratio at the start, that is, the transfer rate is 1 + 1.42 = 2.42 in total (see FIG. 7 (B), Table 2). On the other hand, at the end of recording, the sum of the linear velocities at the position of radius 23 mm on the inner peripheral side and the position of 30.5 mm on the outer peripheral side is 1
It becomes + 1.29 = 2.29. That is, the total maximum transfer rate is 2.42.

FIG. 2 shows a data array on the master side medium in the case of the inner circumference CLV system. Same figure (A)
Is similar to FIG. 1 (A) described above. Here, in this example, since it is the inner circumference CLV, the inner circumference area A (see FIG. 1B)
, The linear velocity is constant, and therefore the transfer rate of the data DA is constant. On the other hand, although the transfer rate of the data DB is variable, in order to keep this constant, the maximum transfer rate 1.42 is set as a reference, and blank data is added to the portion of the transfer rate below that to set the maximum transfer rate. 1.42
The amount of data is commensurate with.

The state is shown in FIG.
This is enlarged and shown in FIG. The first 1.42 data DB1 is exactly the maximum transfer rate of 1.4
Since it is 2, blank data is not added. However, the blank data BB1 is added to the next data DB2 so that the total becomes 1.42. The same applies to the following data. The blank data BB gradually increases, and the last data has a blank data BBn of 0.13.
Is added.

On the other hand, since the data DA on the inner circumference side has a constant transfer rate of 1, the data DA having a predetermined number of bits is shown in FIG. Becomes On the master side medium 51 shown in FIG. 1 (G), the outer circumference data in FIG. 1 (C) and the inner circumference data in FIG. 1 (E) are arranged alternately as shown in FIG. Stored. That is, the data DA with the transfer rate 1 and the data DB with the blank data BB added and adjusted to the maximum transfer rate 1.42 are alternately arranged, and the data is transferred at the transfer rate of the total transfer rate 2.42. It is configured. This is stored in the master medium 51.

<Overall Operation> Next, the overall operation of the present embodiment configured as described above will be described. First, the outer circumference CLV
The case of the method will be described. In this case, copy recording is performed on the inner peripheral side of the MD 10 by the recording head HA of FIG.
Copy recording is performed on the outer peripheral side of the MD 10 by the recording head HB.

On the non-CLV controlled recording head HA side, the operation is performed by the encoding clock generated by the ADIP / PLL circuit 60 based on the ADIP signal detected by the ADIP detection circuit 58A. That is,
The ADIP signal which becomes 22.05 KHz at a constant speed or the clock signal of 6.3 KHz detected from this is supplied to the ADIP / PLL circuit 60 as a reference signal, and the clock of 4.3218 MHz for the encoder 54A, or an integral multiple thereof. Is generated.

On the other hand, on the side of the recording head HB controlled by CLV, the operation is performed by the fixed clock generated by the fixed clock circuit 72. In the master side driver 50,
The master side medium 51 on which the data arranged as shown in FIG. 1 (E) is recorded is set, and its high speed reproduction is performed at a ratio of 1.77. The reproduced data shown in FIG. 7E is separated by the data separation circuit 53 into the inner data shown in FIG. 7D and the outer data shown in FIG. Then, the inner circumference data is output to the buffer memory 52A and temporarily stored, and the outer circumference data is output to the buffer memory 52B and temporarily stored.

Next, the ADI is sent from the buffer memory 52A.
Based on P, the inner circumference data is supplied to the encoder 54A. This inner circumference data is supplied to the driver 56A at the encoder 54A at the timing of the encoding clock supplied from the ADIP / PLL circuit 60, that is, in synchronization with the ADIP address. The driver 56A drives the pickup unit PUA and the recording head HA based on the input data. This allows
The inner circumference data is recorded at the address position synchronized with ADIP.

On the other hand, from the buffer memory 52B, the ADI
Based on P, the outer circumference data is supplied to the encoder 54B. The outer peripheral data is supplied to the driver 56B at the timing of the fixed clock supplied from the fixed clock circuit 72 in the encoder 54B. The driver 56B drives the pickup unit PUB and the recording head HB based on the input data. As a result, the outer circumference data is recorded at a constant linear velocity controlled by CLV.

In this case, data is reproduced and output from the master side medium 51 at a transfer rate of 1.77. Of this data, the data for the inner circumference is 0.77 and the data for the outer circumference is 1. 0.7 to 0.77 on the inner peripheral side of MD10
The recording head HA traces the track at the speed ratio of 1. Thus, the inner peripheral data having the transfer rate of 0.77 is copied and recorded. On the other hand, C is on the outer peripheral side of MD10.
The recording head HB traces a track at a constant speed ratio of 1 by the LV, whereby the outer peripheral data having a transfer rate of 1 is copied and recorded.

Next, the case of the inner circumference CLV system will be described. In this case, in FIG. 4, the ADIP output from the ADIP detection circuit 58B is supplied to the ADIP / PLL circuit 60, and the encoding clock obtained therefrom is supplied to the encoder 54B. On the other hand, the fixed clock circuit 72
The fixed clock output from is supplied to the encoder 54A. Further, the spindle control circuit 70 includes an ADIP
The output of the detection circuit 58A is supplied.

On the CLV-controlled recording head HA side,
The operation is performed by the fixed clock generated by the fixed clock circuit 72. Non-CLV controlled recording head HB
On the side, the ADIP detected by the ADIP detection circuit 58B
The operation is performed by the encoding clock generated by the ADIP / PLL circuit 60 based on the signal.

In the master side driver 50, the master side medium 51 in which the data arranged as shown in FIG. 2D is recorded.
Is set and the high speed reproduction is performed at a ratio of 2.42. The reproduced data shown in FIG. 9D is separated by the data separation circuit 53 into the inner circumference data shown in FIG. 8E and the outer circumference data shown in FIG. Then, the inner circumference data is output to the buffer memory 52A and temporarily stored,
The outer circumference data is output to the buffer memory 52B and temporarily stored.

Next, the ADI is read from the buffer memory 52A.
Based on P, the inner circumference data is supplied to the encoder 54A. The data for the inner circumference is supplied to the driver 56A at the timing of the fixed clock supplied from the fixed clock circuit 72 in the encoder 54A. The driver 56A drives the pickup unit PUA and the recording head HA based on the input data. As a result, the data for the inner circumference is recorded at a constant linear velocity controlled by CLV.

On the other hand, from the buffer memory 52B, the ADI
Based on P, the outer circumference data is supplied to the encoder 54B. This outer peripheral data is supplied to the driver 56B in the encoder 54B at the timing of the encoding clock supplied from the ADIP / PLL circuit 60, that is, in synchronization with the ADIP address. The driver 56B drives the pickup unit PUB and the recording head HB based on the input data. This allows
The outer circumference data is recorded at the address position synchronized with ADIP.

In this case, data is reproduced and output from the master side medium 51 at a transfer rate of 2.42. Of this data, the data for the inner circumference is 1 and the data for the outer circumference is 1.42. On the inner circumference side of the MD 10, the recording head HA traces a track at a constant speed ratio of 1 by CLV, whereby copying and recording of inner circumference data at a transfer rate of 1 is performed. On the other hand, 1.4 on the outer peripheral side of MD10
The recording head HB traces a track at a speed ratio of 2 to 1.29, whereby the outer peripheral data having a transfer rate of 1.42 is copied and recorded.

<Recording Monitoring Method> Next, a method of monitoring and checking the recording state of the MD 10 on which data has been copied as described above will be described. Normally, the purpose can be achieved by reproducing and monitoring a specific portion where data is recorded in a sample manner, but in the present embodiment, a portion where two recording heads HA and HB overlap and trace is used as a monitor. , Efficient checking is done.

That is, the recording head HA that has copied data in the inner peripheral area traces the recording area of the recording head HB when the position of the radius of 23 mm of the MD 10 is exceeded. Therefore, when the recording head HA is switched from the recording operation to the reproducing operation at this position, a reproducing signal can be obtained. At this time, the transfer rate is not constant because it is not in the CLV control area, but if the PLL circuit is subjected to follow-up control, the record data can be demodulated and the quality of the copy data can be determined.

<Effects of the Embodiment> As described above, according to this embodiment, the following effects are obtained. (1) High-speed copying can be satisfactorily performed by the 2-head system. (2) Although the driver on the copy side is of the two-head type, the driver on the master side has one channel, so that control of the driver on the master side becomes easy. Further, since the moving parts of the master side driver are reduced, it is advantageous in terms of reliability and maintainability, and the cost can be reduced. (3) Copy data can be efficiently monitored in real time by utilizing the overlapping portion of the two divided areas, and required functions can be obtained without increasing cost.

<Other Embodiments> The present invention is not limited to the above embodiments, and includes, for example, the following ones. (1) All of the various numerical values shown in the above embodiments are examples, and may be appropriately set as necessary. Further, although the present invention is applied to the data copying for MD in the above-mentioned embodiment, the copying object is not limited to MD at all. The same applies to the medium on the master side, and any desired medium may be used.

(2) The data to be copied is not limited to music, but can be applied to various data such as images and computer programs. (3) In the above-described embodiment, copying was performed by the two-head method, but this does not prevent the present invention from being applied to the three-head method or a multi-head method. However, as described above, the two-head system is excellent in various points.

[0089]

As described above, the recording medium and copying apparatus according to the present invention have the following effects. (1) The copy data in the divided area of the copy side medium on which data is recorded by the multi-head method is combined with one-channel data based on the maximum transfer rate, which is the sum of the data transfer rates of the divided areas, and is copied at the time of copying. Since it is divided for each divided area, data can be copied well at high speed, and the drive system of the recording medium on the master side can be easily controlled, which is advantageous in terms of reliability and maintenance. . (2) Since the copy data is reproduced by utilizing the overlapping portion of the divided areas by the multi-head, the copy data can be efficiently monitored in real time.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a state of data arrangement in a case of an outer peripheral CLV method in a recording medium of the present invention.

FIG. 2 is an explanatory diagram showing a state of data arrangement in the case of the inner circumference CLV method in the recording medium of the present invention.

FIG. 3 is a circuit block diagram showing an example of a one-head type copying apparatus.

FIG. 4 is a circuit block diagram showing an embodiment of a copying apparatus of the present invention.

FIG. 5 is an explanatory diagram showing a relationship between a slider and a head in MD.

FIG. 6 is a graph showing the positions of two heads and the linear velocity ratio in the outer peripheral CLV method.

FIG. 7 is a graph showing the positions of two heads and the linear velocity ratio in the inner circumference CLV method.

FIG. 8 is an explanatory diagram showing a servo target value in MD at a constant speed.

FIG. 9 is an explanatory diagram showing servo target values in MD at 5 × speed.

[Explanation of symbols]

10 ... MD, 12 ... Spindle motor, 50 ... Master side driver, 51 ... Master side medium, 52A, 52B ... Buffer memory, 53 ... Data separation circuit (data separation means), 54A, 54B ... Encoder, 56A, 56B ...
PU driver, 58A, 58B ... ADIP detection circuit, 6
0 ... ADIP / PLL circuit, 70 ... Spindle control circuit, 72 ... Fixed clock circuit, DA ... Inner circumference data, D
B ... Outer data, BA, BB ... Blank data, H
A, HB ... Recording head (recording means), PUA, PUB ...
Pickup unit.

Claims (3)

[Claims] 1. Data to be copied by a multi-head method in a divided area of a medium on the copy side is recorded in combination with one-channel data based on a maximum transfer rate that is the sum of data transfer rates in each divided area. A recording medium characterized by. 2. A copying apparatus which reproduces data from the recording medium according to claim 1 and records the data in each divided area of a copying side medium by a multi-head method, copying composite data reproduced at high speed from the recording medium. A copying apparatus comprising: a data separating unit that separates data for each divided area of a side medium; and a recording unit that records the data separated by the divided area in a corresponding divided area. 3. The copying apparatus according to claim 2, wherein any one of the recording means performs a reproducing operation at an overlapping portion of the divided areas.