JP2003331428A - Recording method for rewritable optical recording medium, and optical disk recording/reproducing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a recording method for a rewritable compact disk realizing recording at high speed such as octuple speed or higher while keeping the compatibility with the conventional CD-RW specification at least in the quadruple speed. <P>SOLUTION: In recording information EFM-modulated by the CLV (constant linear velocity) method onto the rewritable optical recording disk medium by a plurality of mark lengths and inter-mark lengths, when inter-recording mark portions are irradiated with a recording light with an erasure power P<SB>e</SB>capable of crystallizing the amorphous and the recording marks are repetitively irradiated with recording light with a record power P<SB>w</SB>and recording light with a bias power the irradiation time of the light with the power P<SB>w</SB>and P<SB>b</SB>is changed depending on a recording linear velocity. <P>COPYRIGHT: (C)2004,JPO

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] [0001] The present invention relates to a compact disc.
Rewritable phase change media compatible with the disk and its recording method
And a recording / reproducing apparatus. In particular, high speed of 4x speed or higher
Improving overwrite performance at high speed. [0002] 2. Description of the Related Art Generally, compact discs (CDs)
Generated by interference of light reflected from the bottom and mirror surface of the concave pit
Recording and tracking of binary signals using the change in reflectivity
Signal is being detected. In recent years, compatibility with CD
One medium is a phase-change rewritable compact disc.
(CD-RW, CD-Rewritable) used
("CD-ROM professionala
l, USA, September 1996, pp. 29-44.
Proceedings of the Symposium on Optical Recording for Phase Change, 19
1995, pp. 41-45). A phase-change type CD-RW has an amorphous state and a crystalline state.
And phase difference changes caused by the refractive index difference of the state
To detect the recording information signal. Normal phase change medium
The body has a lower protective layer, a phase-change recording layer, and an upper protective layer on the substrate.
Layer and a reflective layer.
Use to control reflectivity difference and phase difference for compatibility with CD
You can have. It is recorded on CD-RW
Refers to overwrite recording, in which recording and erasing are performed simultaneously.
U. As a result, even a high reflectance of 70% or more is included.
Although the compatibility is difficult, the reflectance is 15 to 25%.
Within the range where the recording signal and groove signal are compatible.
Amplification system to cover low reflectivity
If added to the playback system, playback is possible with the current CD drive.
You. [0004] However, CD-RWs
One of the problems when using it is recording speed and transfer rate
There is a delay. The reference speed (hereinafter, 1) for recording and reproducing CDs
Double speed) is a linear velocity of 1.2 to 1.4 m / s.
However, CD-ROMs already have a high speed
And it is used at a low speed of 1x
Is limited to the reproduction of music and images. Generally, 16x speed
Until playback, the original CD constant linear velocity mode (CLV, Co
nstant Linear Velocity)
However, 24 to 40 times speed reproduction is performed in a constant rotation speed mode (CA
V, Constant Angular Veloci
ty), the transfer rate of outer peripheral data,
Access and seek times are significantly faster. [0005] In the case of CD-RW, the speed of recording has been increased.
But stays at 1 to 4 times speed in CLV mode
You. Normally, when a CD-RW is recorded on the entire surface at 1 × speed, it is 74
Minutes (or 63 minutes), and even at 4x speed
It takes almost 0 minutes. However, 10 minutes at 8x speed
Recording can be performed within a long time, and it can record a large amount of data such as music and video.
The use of the CD-RW can be greatly expanded. Also,
At present, external storage devices in computers have high transfer rates.
Magneto-optical recording media (MO) are mainly used
However, by increasing the transfer rate of CD-RW,
It is thought that the use will spread to the use. For this reason, a phase change medium capable of recording at higher speeds
Body and recording methods were required. However, higher linear speeds
CD-RW that can be recorded on a PC has not yet been realized. 1 to
Compatible with CD-RW recording system at 4x speed
The lower is 1x or 2x speed, and the upper is 8x or 10x.
Can be overwritten over a wide linear speed range up to speed
The realization of the medium was technically difficult. The reason is the medium
The recording method was both. The first reason is the amorphous mark
Short-time erasure by high-speed crystallization of amorphous
The problem is that it is difficult to balance time stability.
You. For example, a recording layer of a CD-RW capable of recording at 1 to 4 times speed
AgInSbTe used as a material has an Sb content.
High-speed crystallization can be achieved by increasing the relative density, enabling 8x speed recording
Noh. However, according to the study of the present inventors, the amount of Sb
On the other hand, the increase in
At room temperature, within 1 to 2 years,
In a high temperature environment of 50-80 ° C, it cannot be reproduced in a few days
The amorphous mark disappears due to recrystallization
U. Or number by laser light beam less than 1mm
Amorphous marks begin to disappear after about one hundred to several thousand reproductions
The reliability as a recording medium.
Was not able to be maintained. Solve these problems
CD-RWs are widely used
Restrictions on compatibility with playback-only CD-ROM drives
There is also. For example, in order to achieve reproduction compatibility, the modulation degree 55 to 55
Reflectance of 15 to 25 including high modulation of 70%
%, And other servo signal characteristics. The second reason is that in the CD-RW standard,
Strict recording pulse strategy (pulse division method)
It is specified. That is, the CD-RW standard
Figure 4 of Version 2.0 of Range Book Part 3
Recording pulse strategy as shown in
The current recording pulse strategy generation IC circuit
4x with no need to change pulse strategy
Do not record a wide range of linear velocities from high speed to 8 to 10 times speed.
I have to. FIG. 4 (a) shows the EFM modulated 3T ~
FIG. 4 is a data signal having a time length of 11T.
(B) shows an actual record generated based on the data signal.
This is the laser power for recording light. Pw melts the recording layer
Recording power for forming amorphous marks by rapid cooling
ー 、 Pe to erase the amorphous mark by crystallization
Erasing power, and the bias power Pb is usually
It is almost the same as the light reproducing power Pr. [0008] The mark length modulated information is copied to a phase change medium.
When recording with numerical mark lengths, generally a fixed
In the recording pulse strategy, the maximum used line speed and the minimum used line
The speed ratio is limited to approximately twice. Record at 4x current speed
Many of the possible CD-RW writers are specified in the above standards.
Only a fixed waveform that conforms to the recording pulse strategy
To maintain compatibility with these existing writers.
High-speed recording at least up to about 8 to 10 times speed
It was very difficult. It is an object of the present invention to provide a low line such as 1 to 4 times speed.
Wide line from high speed to high linear speed exceeding 8 to 10 times speed
In the speed range, by EFM modulation, ie data reference
Time length from 3T to 11T for clock period T
Amorphous due to combination of length mark length and length between marks
By performing mark length recording using quality marks as marks,
The recording signal format is compatible with CD playback.
To provide a rewritable medium and a recording method for the medium.
You. In particular, at least four times the speed of a conventional CD-RW
Higher than 8x speed while maintaining compatibility as much as possible with the standard
Rewritable compact discs and
The object of the present invention is to provide a recording method. Note that here
"Compatible" means at least 4x speed
It is possible to respond only by changing the firmware without changing the firmware
It means the degree to which it can be cut. [0010] A first gist of the present invention is as follows.
A rewritable disk-shaped optical recording medium having a phase-change recording layer
Information that is EFM-modulated by the LV method can be transmitted over multiple mark lengths.
When recording based on the
When the time length of the clock is nT (T is the reference clock cycle
Period. n is an integer from 3 to 11), and between recording marks
Irradiates recording light with erasing power Pe that can crystallize amorphous
However, for a recording mark, the time length (n
-J) T is α₁ T, β₁ T, α_Two T, β_Two T, ..., α_mT,
β_mT, (Where m = n-1 or m = n-2)
_i(Α_i+ Β_i) = N−j (j is 0.0 ≦ j ≦ 2.0
Real number), α_iT (1 ≦ i ≦ m)
Pw> Pe that melts the recording layer within the time
Irradiate recording light of recording power Pw, β_iT (1 ≦ i ≦ m)
Within a certain time, the bias power becomes 0 <Pb ≦ 0.5Pe.
-Overwrite by irradiating recording light of Pb, linear velocity
1.2m / s to 1.4m / s as the reference speed (1x speed)
And 231 ns is the reference clock cycle at that time.
(1) At 4 × speed, α₁ = 0.3-1.5,
α_i= 0.2-0.7 (2 ≦ i ≦ m), α_i+ Β_i-1 =
1 to 1.5 (3 ≦ i ≦ m), (2) 1 or 2 × speed
Where α₁ = 0.05-1.0, α_i= 0.05-
0.5 (2 ≦ i ≦ m), α_i+ Β_i-1 = 1 to 1.5 (3
≦ i ≦ m) (3) 6, 8, 10 and 12 times speed
At some double speed, α₁ = 0.3-2, α_i=
0.3-1 (2 ≦ i ≦ m), α_i+ Β_i-1 = 1 to 1.5
(3 ≦ i ≦ m) rewritable optical recording
It lies in the method of recording on a medium. A second gist of the present invention is that a predetermined recording area is
Rotating a rewritable disc-shaped optical recording medium with a constant angular velocity
Information that is EFM modulated by the CAV method
When recording by the length of the laser beam, the linear velocity is from 1.2 m / s to 1.m.
4m / s as the reference speed (1x speed) at the outermost periphery of the recording area
The disk so that the linear velocity of the disk is at least 10 times faster.
Is rotated, and the time length of one recording mark is set to nT.
(T is the reference clock period, and
Radial position such that the product VT with the linear velocity V at
T changes according to. n is an integer from 3 to 11),
Between recording marks, erasing power that can crystallize amorphous
-Pe is irradiated with the recording light, and the recording mark is
The time length (n-j) T of α₁ T, β₁ T, α_Two T, β_Two T, ..., α_mT,
β_mT, (However, m = n-1 α₁ = 0.75-1.25, α_i= 0.25-0.75 (2 ≦ i ≦ m), α_i+ Β_i-1 = 1 to 1.5 (3 ≦ i ≦ m)) in order._i(Α_i+ Β_i) = N-
j (j is a real number satisfying 0.0 ≦ j ≦ 2.0)
Then α_iMelts the recording layer within the time T (1 ≦ i ≦ m)
A recording light having a recording power Pw of Pw> Pe
Irradiate, β_i0 <Pb within the time T (1 ≦ i ≦ m)
Irradiating recording light with a bias power Pb of ≦ 0.5 Pe
Overwrite at any radius position
α₁ And α_i+ Β_i-1 (I = 3 to m) is constant and the inner circumference
About α_i(I = 3 to m) on optical recording medium
It is in the recording method. A third gist of the present invention is that a predetermined recording area
Rotating a rewritable disc-shaped optical recording medium with a constant angular velocity
Information that is EFM modulated by the CAV method
When recording by the length of the laser beam, the linear velocity is from 1.2 m / s to 1.m.
4m / s as the reference speed (1x speed) at the outermost periphery of the recording area
The disk so that the linear velocity of the disk is at least 10 times faster.
Is rotated, and the time length of one recording mark is set to nT.
(T is the reference clock period, and
So that the product VT with the linear velocity V is constant.
T changes depending on the position. n is an integer from 3 to 11),
Between recording marks, an erasing pattern that can crystallize amorphous
The recording light of the power Pe is irradiated, and the recording mark is
Of the time length (n−j) T of α₁ T, β₁ T, α_Two T, β_Two T, ..., α_mT,
β_mT, (However, m = n-1, α_i/ Α₁= 0.3-0.7
(Where i is an integer of 2 to m), α_i+ Β_i-1 = About 1 (3 ≦ i ≦ m)) in order._i(Α_i+ Β_i) = N-
j (j is a real number satisfying 0.0 ≦ j ≦ 2.0)
Then α_iMelts the recording layer within the time T (1 ≦ i ≦ m)
A recording light having a recording power Pw of Pw> Pe
Irradiate, β_i0 <Pb within the time T (1 ≦ i ≦ m)
Irradiating recording light with a bias power Pb of ≦ 0.5 Pe
Overwrite at any radius position
α_iT (i = 2 to m) and α_i+ Β_i-1 (I = 3 to m)
Recording method on rewritable optical recording medium with constant
You. [0013] A fourth aspect of the present invention is a fixed carrier frequency.
f_L0And the signal modulated by the address information
It has a meandering spiral groove with a constant spatial frequency and a recording layer.
Then, in a unit of recording information at a predetermined position of the spiral groove,
Address information for identifying a certain recording block and the block information
Disk with synchronization information identifying the start position of the
Means for rotating at a constant angular velocity about the center portion
Optical pickup that generates a focused light beam for recording and playback
To move in the radial direction to move
And a step for focusing the focused light beam on the recording layer.
Cas servo means and a focused light beam along the spiral groove
Tracking servo means for scanning the groove, and the groove
From meandering to carrier frequency f_A0, Address information and blocks
Means for detecting and decoding a period signal, and the start of the recording block
Position and frequency f_d0To the reference clock T of data having
Synchronize mark length modulated recording data sequence
And the recording laser power corresponding to the recording data sequence.
An optical disk recording device having a means for modulating,
Focused light beam is applied to recording block of specified address in radial direction
Data that changes in inverse proportion to the radius when moved to
A reference signal generator for generating a reference clock T of
Divide the reference clock in diameter to 1 / N (N is an integer)
Reference signal f obtained by_R0And detected at the address
Carrier frequency f of the meandering groove meander_A0By comparing the phases of
Reference clock frequency f of data at constant radius_d0And f
_A0Is f at any radial position_d0= N · f_A0Naruseki
Tweak the disk speed to maintain the engagement
At the start of the recording block and the
Means for achieving synchronization of the data sequence to be performed.
Disc recording and reproducing device. According to a fifth aspect of the present invention, a program
A predetermined application is applied to a continuous area on the inner or outer circumference of the area.
Application program that stores application program data.
Solution program area and the rest of the area at least
User data related to the application program
The user data recording area where data can be recorded
The application program and user data
Fixed-length packet unit with the same file management structure
And the playback of the application and the
Records of user data related to the application
Rewritable optical recording performed at a constant rotation speed
A recording / reproducing apparatus for recording / reproducing to / from a medium,
Access the above specific area of the rewritable optical recording medium
While rotating the disk CAV
Plays back program data and
Program execution means for executing
Application program executed by program execution means
Information that allows you to enter required information according to the ram
While the input means and the disk are rotated by CAV,
Access the user data area and enter the information input
Record the information entered by the user as user data.
Recording means capable of
Recording and reproducing apparatus. [0015] BEST MODE FOR CARRYING OUT THE INVENTION1. About media characteristics In the present invention, a medium of a light spot by recording light is used.
1.2m / s to 1.4m /
s, especially 1.2 m / s as the reference speed, that is, 1 × speed.
You. First, a disc according to the first and second aspects of the present invention
Will be described. The rewritable optical recording medium according to the present invention
It has a circular shape. And the part of the crystal state of the phase change type recording layer
The unrecorded / erased state, and write the amorphous part.
Recording status. The recorded information is recorded on a laser
By irradiating recording light to form an amorphous mark, EF
It consists of an M-modulated signal. Usually spiral on media substrate
Are formed. Amorphous marks are usually formed in grooves.
Formed, but may be formed in the land (land).
No. The groove is usually 22.05k when converted to 1 × speed.
Hz in the radial direction at a frequency based on the carrier frequency.
It is meandering (wobble), such a groove is wobble groove
Call. And, by this meander, the frequency is
The frequency is modulated at a frequency of ± 1 kHz.
Due to strange frequency changes, the address information on the disc is lost.
Included as time information. Such an absolute time
The inter-information is ATIP (Absolute Time In)
  Pre-groove) signal. This wobble groove is used in the CLV mode for the CD.
It was recorded at 1x linear speed and formed on the stamper
And, by injection molding the substrate based on this stamper
Can be formed. To increase recording capacity,
When the transmission frequency is 1.2m / s (± 0.1m / s)
Wobbles to be 22.05 kHz
A groove is formed. When recording data, use the reference clock.
The cycle T is the reference, and various
Form marks and spaces (between marks) with a long time length
To record the data. In EFM modulation,
A mark having a regular time length of 3T to 11T is formed. Ma
In addition, the reference clock period T changes in inverse proportion to the disk linear velocity.
It is usual to make The reciprocal of the reference clock cycle T is
It is called the reference clock frequency and is 1x the speed of CD (linear velocity)
1.2 m / s to 1.4 m / s)
The wave number corresponds to one channel bit of data, usually 4.3.
218 MHz. This reference clock frequency also
Just above the wobble reference frequency 22.05kHz
It is 196 times. Reference clock cycle at 1x speed
Period T is usually 1 / (4.3218 × 10⁶ ) ≒ 231 × 1
0^-9(Second) = 231 (nanosecond). In the following description
Are the reference clock cycle T and the linear velocity V unless otherwise specified.
Is constant regardless of the linear velocity. FIG. 2 shows a CD file including a CD-RW.
The reproduction waveform of the EFM modulated signal used in the
FIG. 3T for eye pattern
All amorphous mark and crystalline space of 11T
Are substantially randomly included. Play wave
The shape is obtained by taking the reflected light intensity as a voltage signal and using an oscilloscope.
It is a waveform observed on the loop. At this time, the reproduction signal is DC
Contains ingredients. Top I of the eye pattern_topThe incident light
Is converted to reflectivity corresponding to the space.
Upper emissivity value R_topAnd the amplitude of the eye pattern (actual
Above is the amplitude of the 11T mark) I₁₁To I_topStandardized by
The modulation degree m of the recording signal represented by the following equation (1)₁₁so
is there.         m₁₁= I₁₁/ I_top× 100 (%) (1) In the present invention, the modulation degree m₁₁Is less than 60%
The upper limit is 80% or less. Modulation depth depends on optical resolution
Therefore, optical systems with large NA tend to look large.
In the present invention, a laser beam having a wavelength of about 780 nm is used.
And an optical system having a numerical aperture NA = 0.5 or NA = 0.55.
Of modulation m when illuminating and recording through₁₁And However, waves
The length need not be strictly 780 nm;
What is necessary is just to be in the range of about 5 nm. Signal amplitude I₁₁Is big
Is preferable, but if too large, the signal
Since the gain is extremely saturated, m₁₁Upper limit is 80
%, Preferably about 78%, more preferably about 75%
is there. On the other hand, if it is too small, the signal-to-noise ratio (SN ratio) is low.
The lower limit is 60%, preferably 62%,
More preferably, it is about 65%. Also, R_topIs 1
5 to 25%, preferably 15 to 20%, more preferably
Is in the range of 16 to 19%. Further, the following equation (2) Asym = (I_slice/ I₁₁-1/2) (%)
The asymmetry value Asym defined in (2) can be
Is preferably around 0, but usually ± 10%
Range. Where I_sliceIs in I in FIG.
The voltage difference between the core 2001 and the bottom of the envelope,
₁₁Is the top 2003 and the bottom 2 of the envelope
002. Each of 3T to 11T used for EFM modulation
Mark length and space length jitter, and
And the deviation are shown in FIG.
Signal passed through a high-pass filter
After taking out
Is obtained by DC slicing with the low level as the threshold.
From the predetermined value (nT) of the average value of the lock length or space length
Deviation (deviation) and standard deviation (jitter)
is there. For detailed measurement method, refer to Red Book
And Orange Book, which is a CD-RW standard, and “CD
Amilly ”(published by Ohmsha, April 25, 1996).
Is defined. In the present invention, for jitter,
Playback at 1x speed (reference clock cycle 231 nanoseconds)
Jitter value is 35 ns or less, preferably 30 ns
Or less, more preferably 25 nanoseconds or less. In addition,
Normally, 3T marks or jitter between marks is 3T to 1
It is the worst value in 1T. In the present invention,
The solution is usually ± 40 nanoseconds or less at 3T and ± 6 at 11T.
0 nanoseconds or less. For 4T to 10T,
Normally less than ± 40 nanoseconds specified for 3 and 11T
And ± 60 nanoseconds or more. What
Note that the quality of the recorded signal is basically
It is preferable to satisfy the same characteristics as the case. For more information,
Satisfying the contents described in Part 3 of the book
preferable. Modulation degree m₁₁, The upper limit R of the reflectance_TOPAnd di
By setting the value to the above value, the conventional CD-RW
8x speed, especially 10x speed or higher, while maintaining compatibility with standards
High-speed recording is possible. Preferably at 8x speed
Consists of 3T mark and 3T space (between marks)
After recording a single period signal, 11T mark and 11T space
3T when a single cycle signal consisting of
The mark erase ratio is 25 dB or more, especially 27 dB or more.
You. More preferably at 10 × speed, especially at 12 × speed
The erase ratio is 25 dB or more. Erase ratio at high linear velocity
The higher the medium, the faster the recrystallization rate when erasing amorphous marks.
Overwrite of EFM signal at higher linear velocity
is there. For example, the erasing ratio at 12 × speed is 25 dB.
Above, good characteristics when used at 12x speed
Of course, and good when used at 10 times speed.
Characteristics are obtained. The erasing ratio is defined as a linear velocity range in which overwriting is performed.
If the upper limit of the box is a sufficient value, the linear velocity side is lower than normal
There is no shortage. Of the numerical aperture NA moving at the linear velocity V
The recording layer is illuminated with the light beam of wavelength λ collected by the objective lens.
Is the firing time normalized by λ / (NA · V)?
Therefore, the lower the linear velocity, the longer the irradiation time and the time required for recrystallization.
This is because sufficient time can be secured. Also, record in advance
Of the recorded signal is 35 ns at 1 × speed reproduction
ec (nanosecond) until the recording medium
The temperature, 80 ° C, and relative humidity of 85 are assumed to be the life of the kival.
% Of archival life is 500 hours or more.
Is desirable. Further, in the present invention, the modulation degree m₁₁
Is 50 in an accelerated test environment at a temperature of 80 ° C and a relative humidity of 85%.
90% or more of the initial value, especially 95% or more, after 0 hours
Is preferred. In the present invention, the linear velocity V (where V is 8 times)
Speed, 10 times speed or 12 times speed)
m₁₁, R_top, Jitter, deviation, asymmet
The linear speed and the erasure ratio are based on the standard speed of 1.2 m / s.
Degree (1x speed) V₁, And at linear velocity V, the data
The reference clock period T is VT = V₁T₁(However, T₁Is
231 ns)
The recorded signal is recorded in one recording within the conditions of recording method 1 below.
After overwriting 10 times with the system,
It is given from a recording signal obtained by reproduction. Recording method 1: Light with a wavelength of 780 nm
Irradiate via an optical system with a number NA of 0.55 or 0.5
You. At this time, the time length of one amorphous mark is set to nT
(N is an integer from 3 to 11)
For the interval, the erasing power Pe that can crystallize the amorphous
Irradiate and record marks, the length of time
(N-j) T is α₁T, β₁T, α_TwoT, β_TwoT, ...
α_mT, β_mT (where m = n-1, α₁= 1.0,
α_i= 0.5 (i is an integer of 2 to m), β_m= 0.25
0.75, α_i+ Β_i-1= 1.0 (i is 2 to m
） I (α)_i+ Β_i) = N−j
(J is a real number from 0 to 2.0), Α_iWithin a time T (i is an integer from 1 to m)
Is a recording light having a recording power Pw sufficient to melt the recording layer.
(However, Pw is 14 to 25 mW, and Pe / Pw =
0.5) and β_iTime T (i is 1 to m
Of the bias power Pb of 0.8 mW.
Irradiate recording light. In the present invention, the speed is increased to 4 times.
Even if the modulation degree m₁₁, R_top, Jitter, deviation
Values, asymmetry values, and erasure ratios fall within the above numerical ranges.
It is preferred that Degree of modulation at 4x speed
m₁₁, R_top, Jitter, deviation, asymmet
The linear speed and the erasure ratio are based on the standard speed of 1.2 m / s.
Degree (1x speed) V₁, The speed becomes 4 times the reference speed V
And the data reference clock cycle T is VT = V₁T₁(T
But T₁Is 231 ns)
EFM modulated signal from the following recording system 2 or 3
Overwrite recording 10 times with one of the recording methods
After that, from the recording signal obtained by the reproduction at 1x speed
Given. Recording method 2: Light with a wavelength of 780 nm
Irradiate via an optical system with a number NA of 0.55 or 0.5
You. At this time, the time length of one amorphous mark is set to nT
(N is an integer from 3 to 11)
For the interval, the erasing power Pe that can crystallize the amorphous
Irradiate and record marks, the length of time
(N-j) T is α₁T, β₁T, α_TwoT, β_TwoT, ...
α_mT, β_mT (where m = n-1, α₁= 1.0,
α_i= 0.3 to 0.6 (i is an integer of 2 to m), β_m=
0.25 to 0.75, α_i+ Β_i-1= 1.0 (i is 2
整数 i (α)_i+ Β_i) = N−j
(J is a real number from 0 to 2.0) Α_iWithin a time T (i is an integer from 1 to m)
Is a recording light having a recording power Pw sufficient to melt the recording layer.
(However, Pw is 14 to 25 mW, and Pe / Pw =
0.5) and β_iTime T (i is 1 to m
Of the bias power Pb of 0.8 mW.
Irradiate recording light. Recording method 3: Light with a wavelength of 780 nm is
Irradiate via an optical system with a number NA of 0.55 or 0.5
You. At this time, the time length of one amorphous mark is set to nT
(N is an integer from 3 to 11)
For the interval, the erasing power Pe that can crystallize the amorphous
Irradiate and record marks, the length of time
(N-j) T is α₁T, β₁T, α_TwoT, β_TwoT, ...
α_mT, β_mT (where m = n-1, α₁= 0.4,
α_i= 0.15 to 0.25 (i is an integer of 2 to m), β_m
= 0.25 to 0.75, α_i+ Β_i-1= 1.0 (i is 2
整数 i (α) _i+ Β_i) = N−j and
(J is a real number from 0 to 2.0) Α_iWithin a time T (i is an integer from 1 to m)
Is a recording light having a recording power Pw sufficient to melt the recording layer.
(However, Pw is 14 to 25 mW, and Pe / Pw =
0.5) and β_iTime T (i is 1 to m
Of the bias power Pb of 0.8 mW.
Irradiate recording light. In addition, "overwrite" means general
The data once recorded is not recorded evenly by specific processing.
Overwrite new data without returning to recording / erasing state
It indicates that. However, in the present invention, the initial uniform
When recording in the unrecorded / erased state,
I can grasp. For example, it is also described in the above recording methods 1 to 3.
“10 times overwriting” means that the initial crystal state
Record (1 overwrite), then 9 times
Means to perform bar light, as described below.
The same applies to this. In addition, in recording methods 1 to 3
"Α_i+ Β_i-1= 1.0 ”is (α_i+ Β_i-1)But
Means the same time length as the reference clock period T
Errors that are inevitable in circuit design
Differences can be included. Furthermore, recording methods 1 to 3
Wavelength of the recording light in the range of about 775 to 795 nm
Variations are not a major problem. [0029]2. About the recording layer of the medium In the rewritable optical recording medium of the present invention, the amorphous mark
Short-time erasure by high-speed crystallization of amorphous
It is important to balance the time stability. And again
In order to make playback compatible with a raw CD-ROM drive,
If the reference optical system satisfies a high degree of modulation,
In addition, the reflectivity must be satisfied with other servo signal characteristics, etc.
Is preferred. Provided on the substrate for high-speed crystallization and stability over time
The selection of the material for the phase change type recording layer to be used is most important.
In the present invention, it is important to increase the crystallization speed of the recording layer.
Yes, this is achieved by finely adjusting the composition of the recording layer.
Achieved. As the composition of the recording layer material, in particular, SbTe
Alloy containing excess Sb over eutectic composition, more specific
Has Sb₇₀Te₃₀Excess Sb based on eutectic point composition
Sb including₇₀Te₃₀It is preferable that the base material is an alloy. S
the presence of excess Sb in the bTe eutectic composition
High-speed crystallization becomes possible. Among them, especially
M including Ge_zGe_y(Sb_xTe_1-x)_1-yzcomposition
(However, 0 ≦ z ≦ 0.1, 0 <y ≦ 0.1, 0.72
≦ x ≦ 0.8, and M is In, Ga, Si, Sn, P
b, Pd, Pt, Zn, Au, Ag, Zr, Hf, V,
Nb, Ta, Cr, Co, Bi, O, N, S and rare earth
At least one selected from the group consisting of metals)
It is preferred to select from The preferred composition is the SbTe eutectic point composition
Stability and jitter over time in binary alloy containing excess Sb
Based on ternary alloy with Ge added for improvement
Can be thought of. At this time, Ge becomes excessive Sb.
Without losing the high-speed crystallization function.
It is considered to have a function of improving the stability over time. Ma
In addition to raising the crystallization temperature,
Is considered to be the most effective element for enhancing energy
You. The Ge amount is 0.03 or less as the value of y in the above equation.
Above, it is particularly preferable that it is 0.04 or more. G
If the amount of e is too large, it is probably GeTe or GeSbTe type
Of different optical constants due to the precipitation of
Crystal grains are mixed, noise of the recording layer rises and jitter increases
In some cases, even if too much is added,
Since the time stability is not improved, the Ge amount is usually calculated by the above equation.
0.1 or less, preferably 0.08 or less as the value of y
It is. If the excess Sb is too small, recrystallization may occur.
Speed is too low and good auto
Since bar lighting may not be possible,
x is at least 0.72, preferably at least 0.73, more preferably
More preferably, it is 0.74 or more. On the other hand, the amount of Sb is too much
Then, the recrystallization speed is too fast, and the CD-
Good amorphous mark shape with pulse division method of RW standard
And jitter becomes very high.
In addition, the stability over time of the amorphous mark tends to deteriorate.
Therefore, the above x is 0.80 or less, preferably 0.79
Hereinafter, it is more preferably 0.78 or less. Optimal pair
The range of formation differs slightly depending on the numerical aperture NA. NA is large
If the focused light beam is more focused,
This is because the later cooling rate of the recording layer tends to be slightly higher.
Therefore, for NA = 0.5, x is 0.73-0.7.
8 is preferred and for NA = 0.55 x is
A range of 0.75 to 0.80 is preferred. This intermediate N
For A, it is necessary to use these intermediate composition regions.
preferable. In the above composition formula, one of the above-mentioned M
By adding at least one of the elements of the group
Further, the characteristics are improved. In, Ga, Si and Sn are
This is effective in reducing jitter. N, O and S are repeated
Prevention of segregation and fine adjustment of optical characteristics
There is an effect that can be adjusted. Bi, Zn, Pd, P
t, Au, Ag and the rare earth metal are
There is an effect that the entire surface is easily crystallized. Zr, H
f, V, Nb, Ta, Cr, Co and Pb
It is effective in improving the time stability. However, the amount of the element M is large.
If too long, segregation of specific substances over time and repeated overlay
The amount of the element M added
Is a value of 0.
It is preferably set to 1 or less, particularly 0.09 or less. Segregation
If this occurs, the stability and re-solidification of the amorphous layer that the recording layer initially has
The initial overwrite characteristics were not obtained due to changes in the crystallization speed, etc.
It is not preferable because it will not be able to be done. In particular, O, S and N
Is the sum of these and the sum of Sb, Te and Ge
More preferably, the content is 5 atomic% or less. As the element M, In and Ga are particularly jitters.
This is effective in reducing and expanding the corresponding linear velocity margin. Special
A¹ _aA^Two _bGe_c(Sb_dTe_1-d)_1-abccomposition
(However, 0 ≦ a ≦ 0.1, 0 <b ≦ 0.1, 0.02
<C ≦ 0.2, preferably 0.02 <c ≦ 0.1, 0.
72 ≦ d ≦ 0.8, and A¹Is Zn, Pd, Pt,
V, Nb, Ta, Cr, Co, Si, Sn, Pb, B
at least one selected from the group consisting of i, N, O and S
seed. A^TwoIs a small number selected from the group consisting of Ga and In
At least a kind. ), Such as InGeSbTe quaternary alloy or
Is the recording layer composition based on InGaSbTe quaternary alloy
Is more preferred. If the amount of In or Ga is too large,
Therefore, the value of b is usually 0.1 or less,
Preferably, it is 0.06 or less. By doing this
Even if you overwrite more than 10,000 times
Segregation can be suppressed. The above composition formula
Is preferably the same as the value of x described above,
0.73 or more, more preferably 0.74 or more,
Preferably 0.79 or less, more preferably 0.78 or less
However, the optimum value varies depending on the numerical aperture, and NA
= 0.53, x = 0.73 to 0.78, NA = 0.55
It is preferable that x = 0.75 to 0.80. Where
The composition of the recording layer is particularly preferable compared to other compositions.
I will tell. For the InGeSbTe alloy, refer to
3195, JP-A-1-14083, JP-A-Hei.
JP-A-5-16528, JP-A-9-293269
, But in any case GeTe-Sb_Two Te_Three Fake
The composition near the similar binary alloy is preferred. The composition of the present invention is different from these,
bTe is a composition containing eutectic composition as a main component and excess Sb.
is there. GeTe-Sb if the speed is about 1-2 times_Two T
e_Three A pseudo binary alloy with excess Sb added
Also, a rewritable compact disc can be realized (see
JP-A-4-221735, JP-A-5-62193
Information). GeTe-Sb _Two Te_Three Ge on the line connecting₁ S
b_Four Te₇ , Ge₁ Sb_Two Te_Four Or Ge _Two Sb_Two
Te_Five The composition has the highest crystallization speed, and Sb is added.
By doing so, the crystallization speed is reduced. However, 1
Excessive Sb so that overwriting can be performed at 2x speed
Crystallization speed for high-speed recording of 4x speed or more
The degree of erasure is too slow and the overwriting cannot be performed
No. Conversely, if the amount of Sb is reduced in accordance with 4 × speed recording,
Since recrystallization at 1 and 2 times speed becomes remarkable, amorphous
The formation of cracks is impaired by recrystallization during resolidification. You
In other words, even if only the amount of Sb is adjusted, even if the amount is adjusted to the CD-RW standard,
Overwrite at 2-4x speed while maintaining compatibility
It is difficult to manifest. The same applies to 4 to 8 times speed recording.
You. When the medium is designed for 4x speed, the same at 8x speed
It is difficult to obtain good recording characteristics with strategy
It is. Also, a wide range of conventional 2- to 4-fold speed CD-RWs
AgInSbTe and AuInSb used for
Composition of Te alloy (JP-A-10-326436, etc.)
Compared with the above, the composition of the present invention is stored at room temperature.
Excellent stability. For example, in an AgInSbTe alloy,
Overwriting at 8 × to 10 × speed itself is not possible.
You. But perhaps at the same time the activation energy of crystallization
Decrease or decrease the crystallization temperature.
The stability of the work tends to deteriorate. At high linear velocity overwriting
Crystallization rate at room temperature and low amorphous mark at room temperature
It is difficult to satisfy both demands of qualification. AgI
nSbTe and the above characteristics of the GeSbTe system of the present invention
The reason for the difference is not always clear. But G
In the eSbTe system, excess Sb is simply a nucleus for recrystallization.
Involvement in formation and involvement of four-coordinate Ge
The atomic network structure becomes locally strong,
At low temperatures near the temperature, nucleus growth centered on the crystal nuclei (net
Local changes in the local structure of the network)
it is conceivable that. Incidentally, Japanese Patent Application Laid-Open No. 1-303643,
JP-A-4-28587 and JP-A-10-1120
No. 28 discloses the above GeSb preferred in the present invention.
Although a Te-based recording layer is described, these compositions are
Applicable to a specific format called Pact Disc
And high linear velocity recording, such as 8x speed or more
Used for high linear velocity recording and low linear velocity recording
There is no mention of being applicable to both. Also,
The modulation m₁₁, R_topAnd jitter
Is not determined. In the present invention, the recording layer is formed by the above-described method.
In the crystalline state, from face-centered cubic and / or hexagonal structure
Is preferred. In this case, the recording layer has a single crystalline phase
May be composed of several crystalline phases
Good, but if there is more than one crystal phase,
Preferably not. As a result, noise is reduced,
Improved stability, easy crystallization at high speed, etc.
Performance can be improved. This is Sb_TwoTe_ThreeEtc.
Although it is a cubic crystal such as a crystal phase having a hexagonal structure or Sb
Crystal phase with a significantly different lattice constant, and furthermore Sb₇Te,
Sb_TwoTe_ThreeOther crystal phases belonging to other space groups such as
When present, grain boundaries with large lattice mismatch are formed
As a result, the peripheral shape of the mark may be
Is considered to occur,
Phase, no such grain boundaries occur.
It is thought. The unit cell constant of the preferred crystal phase is preferably
In the case of a centered cubic crystal, it is usually 5.5 ° or more, and preferably 5.8 ° or more.
Å or more, and usually 6.8Å or less, preferably 6.
5 ° or less. In the case of a hexagonal crystal, the a-axis is usually 4 to 4.5.
Å, c-axis 30 to 35 °. Multiple crystal phases exist
In this case, there is no lattice mismatch, and
In order to obtain the same crystal structure,
Is preferably about ± 5% or less. Crystal phase
May be a stable crystalline phase in a state of thermal equilibrium.
It may be a metastable crystal phase that appears depending on the fabrication conditions. Associate
The stable crystalline phase is not necessarily the lowest energy thermodynamically
It does not correspond to the condition, but is completely unstable
Not the phase change type used for optical information recording media.
Crystals that can exist substantially stably in the recording layer
Phase. The preferred crystalline phase in the present invention is f
considered to belong to the m3m space group and / or the F43m space group
Can be FIG. 32 shows an example in which
By the same manufacturing method as that of the phase-change type optical information recording medium,
The recording layer (thickness: about 20 nm) from the obtained medium
In obtained by_ThreeGe_FiveSb₇₀Te_{twenty two}Transmission electron microscopy of thin films
It is an electron beam diffraction image by a microscope (TEM). In the figure, A,
Points B, C, and D are respectively Miller indices (220),
(002), (222) and (111). This
For each point of A, B, C and D appearing in the diffraction image of
Explain the indices consistently, and obtain different
Those that can explain the diffraction image of the turn without contradiction are
It has a tetragonal structure and belongs to the Fm3m or F43m space group.
Crystal structure. In addition, the plane orientation is shown in the electron diffraction image.
Although only the rotation shown in FIG. 5 was obtained,
It is presumed that it is formed from almost a single crystal phase. Ma
Also, in X-ray diffraction, other crystal structures such as Sb phase
It was also confirmed that no related peak was observed. From the electron beam diffraction image shown in FIG.
Belongs to the F43m space group with a child constant of about 6.4Å, or
Whether it belongs to the F43m space group with a lattice constant of about 6.1Å
It turns out that it is. The former is a face-centered cubic Ge
_ThreeIn₁₃Sb₇Te_ThreeSolid solution or AgInTe_TwoF43
having the same structure as the crystal type belonging to the m space group
And the latter is AgInTe_TwoBelongs to the Fm3m space group of
Crystal system or AgSbTe_TwoBelongs to the Fm3m space group of
It has the same structure as the crystal type. The same space group is used for GaSb and InSb.
There are crystal systems belonging to
32, and the electron beam of FIG.
It is very close to the value of the unit cell constant obtained from the diffraction image. This
Means that in the recording layer composition of the present invention, In and / or
Considering that the presence of Ga is preferable, these
Semi-anion in Sb-te-Ge solid solution in which crystal is a parent
It suggests that it promotes the formation of a constant structure. It should be noted that a composition having a larger Sb / Te ratio
Tendency to obtain a single phase of tetragon in preference to face-centered cubic
It is in. Sb is in excess of SbTe eutectic composition.
In particular, since the other crystal phases are easily formed,
Take measures such as devising initialization as described later.
A substantially single phase, especially a single face-centered cubic
It must be made of structure. Of the crystalline phase of the recording layer
The form largely depends on the method of initializing the recording layer. That is,
In order to form the preferred crystalline phase in the present invention,
It is preferable to devise a method for initializing the recording layer as follows.
Good. The recording layer is usually made of a physical material in a vacuum such as a sputtering method.
The film is formed by a vapor deposition method, but as-deposi
In the ted state, it is usually amorphous, so
It is crystallized to be in an unrecorded and erased state. Initialize this operation
Called. As the initialization operation, for example, the crystallization temperature
(Usually 150-300 ° C.)
Laser annealing or flash lamp light.
Any light energy irradiation such as annealing, melting initialization, etc.
Method, but the recording layer in the preferred crystalline state is
To obtain, melt initialization is preferred. Annie in the solid phase
In the case of ル, there is time to achieve thermal equilibrium
Therefore, another crystal phase is easily formed. In the melting initialization, the recording layer is melted.
May be directly recrystallized during resolidification.
Sometimes once in an amorphous state, solid state reconsolidation near the melting point
It may be crystallized. At this time, if the crystallization speed is too slow
Because there is enough time to achieve thermal equilibrium,
Since a crystal phase may be formed, the cooling rate
Preferably faster. For example, the time for maintaining the temperature above the melting point is usually
2 μs or less, preferably 1 μs or less
No. In addition, it is preferable to use laser light for melting initialization.
And, in particular, an elliptical shape having a short axis substantially parallel to the scanning direction.
Initialization using a laser beam (hereinafter, this initialization method)
Is sometimes referred to as "bulk erase").
No. In this case, the length of the long axis is usually 10 to 1000 μm
And the length of the minor axis is usually 0.1 to 10 μm.
The lengths of the major axis and minor axis of the beam here are
Half-width when measuring the light energy intensity distribution in the system
Defined from The scanning speed is usually about 1 to 10 m / s
is there. Overwrite recording of phase change medium to be used
When scanning at a speed higher than the maximum linear speed,
The area once melted by the work may become amorphous.
You. In addition, the speed is about 30% lower than the maximum linear velocity.
When scanning at a degree, phase separation occurs and it is difficult to obtain a single phase.
Therefore, a scanning speed of 50 to 80% of the maximum working linear speed is preferable.
Good. The maximum operating linear velocity is the linear velocity
When the light of erasing power Pe is irradiated at
It is determined as the upper limit of the linear velocity as performed. Laser light source
Various types such as semiconductor lasers and gas lasers are used.
Can be used. The power of laser light is usually 100mW to 2W
It is about. At the time of initialization by bulk erase, for example,
When using a disk-shaped recording medium, the short axis direction of the elliptical beam
Is almost coincident with the circumferential direction.
And the long axis (half)
Dia) to initialize the entire surface.
You. The moving distance in the radial direction per rotation is the beam long axis.
Make them shorter and overlap, and record the same radius several times.
It is preferable to irradiate with a laser light beam.
As a result, reliable initialization is possible, and beam half
Derived from radial energy distribution (usually 10-20%)
It is possible to avoid non-uniform initialization states. on the other hand,
If the moving amount is too small, the other unfavorable
Normally the amount of movement in the radial direction because the crystal phase is easily formed
Is usually １ ／ or more of the major axis of the beam. At the time of melt initialization, two laser beams are used.
To melt the recording layer once with the preceding beam,
Recrystallization with the second beam
Can also be done. Here, the distance between each beam
If the separation is long, the area melted by the preceding beam
After consolidation, it is recrystallized with a second beam. Dissolution
Whether or not melt recrystallization has been performed is determined by the actual
Erasing after overwriting of amorphous mark by recording light
And R in the unrecorded state after initialization
It can be determined whether or not 2 is substantially equal. Where R1
Measurement is a signal where amorphous marks are recorded intermittently.
When using a number pattern, multiple overwriting and
It is usually performed after overwriting about 5 to 100 times. This
By doing so, it is possible to leave the unrecorded state with only one recording
Eliminate the effect of reflectivity between possible marks. The above-mentioned erased state is not necessarily limited to the recording focusing layer.
No modulation of the laser beam according to the actual recording pulse generation method
Even if the recording power is applied in a DC manner, the recording layer is melted.
It can also be obtained by resolidification. In the present invention
Is that the value of the following formula (F1) defined by R1 and R2 is 1
0 (%) or less, especially 5 (%) or less
Is preferred. [0048] (Equation 1)     2 | R1−R2 | / (R1 + R2) × 100 (%) (F1) For example, in a phase change medium in which R1 is about 17%
Is sufficient if R2 is approximately in the range of 16 to 18%. Heel
In order to achieve the initialized state, the actual recording conditions
Preferably, a thermal history equal to is provided by initialization. [0050]3. About layer structure of media Next, other than the layer configuration and recording layer of the medium used in the present invention.
Layer will be described. Layer configuration and set of layers other than the recording layer
Is to achieve both high-speed crystallization of the recording layer and stability over time.
First, the optical characteristics of the medium are set to a specific range and playback compatibility with CDs
It is important to keep. The substrate of the medium of the present invention includes
Transparent such as carbonate, acrylic and polyolefin
Resin or transparent glass can be used. Inside
But polycarbonate resin is most widely used in CD
It is the most preferable because it has a proven track record and is inexpensive.
The thickness of the substrate is usually 0.1 to 20 mm, preferably 0.3
mm to 15 mm. Generally about 1.2mm
It is. The recording layer prevents deformation due to high temperature during recording.
It is desirable that the top and bottom are covered with a protective layer
(For convenience of explanation, the light incident on the recording layer is
Protective layer is the lower protective layer, and the protective layer on the opposite side is the upper protective layer.
Sometimes referred to as a layer. ). More preferably, a lower protective layer is provided on the substrate.
A layer, a recording layer, an upper protective layer and a reflective layer are provided. this
In this case, the surface opposite to the substrate
It can be coated (protective coat) with a curable resin.
Preferably, to maintain compatibility with current CD systems
The lower protective layer, recording layer, upper protective layer and reflection
The layers are provided in this order. Recording layer, protective layer and reflective layer
Can be formed by a sputtering method.
In this case, the target for the recording film, the target for the protective film,
If necessary, use the same vacuum
Sputtering with in-line equipment installed in the chamber
The point that film formation by GaN prevents oxidation and contamination between layers
Is desirable. The material used for the protective layer is
Rate, thermal conductivity, chemical stability, mechanical strength, adhesion, etc.
Determined with care. Generally high transparency and high melting point
Oxides, sulfides, nitrides, Ca, M of certain metals and semiconductors
g, a fluoride such as Li can be used. these
Oxides, sulfides, nitrides and fluorides are not necessarily stoichiometric
It is not necessary to take an appropriate composition, and it is necessary to control the refractive index etc.
It is also effective to control or mix them. Repetitive
In view of recording characteristics, a mixture of dielectrics is preferred. Yo
More specifically, ZnS, ZnO, rare earth sulfide and oxidized
And mixtures with heat-resistant compounds such as carbides, nitrides, and carbides.
It is. The film density of these protective layers is 80% or less of the bulk state.
Above is desirable from the viewpoint of mechanical strength. In the present invention
The thermal conductivity of the protective layer, especially the upper protective layer
It is preferable to reduce the size by only Specifically, the thermal conductivity
It is preferable to use the one less than 1J / (mks)
No. Examples of such a material include ZnS and 50 mo.
A mixture containing 1% or more can be mentioned. The thickness of the lower protective layer is usually at least 30 nm.
Is at least 50 nm, especially at least 60 nm, and more preferably 80 n
m or more is preferable. Heat damage during repeated overwriting
In order to suppress substrate deformation due to
Is necessary, and if the thickness of the lower protective layer is too small,
Overwrite durability tends to rapidly deteriorate. Special
Jitter increases sharply in the initial period when the number of repetitions is less than several hundred.
Tend to add. The deterioration of the jitter at the beginning of repetition is lower
It greatly depends on the thickness of the protective layer. Atomic force microscope of the present inventors
According to microscopic observation (AFM), this initial deterioration
Deformation of the plate surface by about 2 to 3 nm
I understood. In order to suppress substrate deformation, the recording layer
There is a thermal insulation effect to prevent heat from being transmitted to the board, and
It is necessary to have a protective layer thickness that mechanically suppresses deformation.
Therefore, the above film thickness is preferable. On the other hand, the reflectance R_TOPDependence of lower protective layer thickness
In view of the properties, the reflectance becomes minimum at 60 to 80 nm, and 0
And about 150 nm. wavelength
With respect to 780 nm, a commonly used refractive index of 2.0 to
In the case of a protective layer made of about 2.3 dielectric, the lower protective layer
For each film thickness, the reflectance changes periodically to take maximum and minimum values.
Shows Therefore, making it too thick is optically meaningful.
No taste, increase in material cost, groove thickness due to thick film formation
Bottom protection
The layer is usually 150 nm or less, preferably 120 nm or less.
I do. On the other hand, the thickness of the upper protective layer is 30 nm or more, especially 3 nm.
5 nm or more is preferable. The upper protective layer is mainly opposite to the recording layer.
Prevent interdiffusion of the emissive layer. Note that the upper protective layer is too thin
It is easily destroyed by deformation etc. when the recording layer melts,
The heat dissipation effect is so large that the power required for recording is unnecessarily large.
It tends to be easier. In particular, as in the present invention, the speed is 8 times or more.
When trying to record at high speed, the decrease in recording sensitivity is good.
Not good. On the other hand, if the upper protective layer is too thick,
The temperature distribution of the part becomes sharp, and the deformation of the protective layer itself is large
Become more likely to accumulate due to overwriting
Therefore, it is usually 60 nm or less, preferably 55 nm or less.
You. The thickness of the recording layer is 10 nm or more, especially 15 nm or more.
preferable. Sufficient contrast if recording layer is too thin
And the crystallization rate tends to be slow.
You. In addition, recording and erasing in a short time tends to be difficult. On the other hand, the thickness of the recording layer is usually 40 nm or less.
However, it is preferably 30 nm or less, particularly 25 nm or less.
No. If the film thickness is too large, the optical contrast
It is difficult to obtain, and since the heat capacity is large,
Degree may worsen. Furthermore, the notes accompanying the phase change
The change in volume of the recording layer increases as the recording layer becomes thicker.
If the recording layer is too thick, it will be
Microscopic deformation is accumulated on the protective layer and the substrate surface, etc.
May lead to an increase in The thicknesses of the recording layer and the protective layer are determined by the mechanical strength and
From the aspect of reliability (especially durability of repeated overwriting)
Considering the interference effects associated with the multilayer configuration in addition to the limitations,
Laser light absorption efficiency and the amplitude of the recording signal,
Increased contrast between recorded and unrecorded states
To be elected. Layer composition that can balance all of these
Then, the refractive index of the upper and lower protective layers is set to 2.0 to 2.3,
Lower protective layer thickness d_L, Recording layer thickness d_R, Upper protective layer thickness
d _UWhere 15 ≦ d_R≦ 20 nm, 30 ≦ d_U≤
60 nm and d_UAnd d_RAnd d_U= ｛-5d_R+
130 ° ± 10 nm, and
Light R for crystalline state_topOf d_LIn dependence, R
_topOf d_LThick film direction from minimum value in 60-80 nm
∂R until the next minimum value to_top/ ∂d_L> 0
It is desirable to select In the medium of the present invention, the heat radiation effect of the reflection layer
Higher than 1x to 4x speed compatible CD-RW media
Is important. Fine-tune this composition and specify
By combining with the recording layer, higher linear velocity and
Recording at both low linear velocities becomes possible. In particular, the above protective layer
Use of low thermal conductivity material as
With this, a greater effect can be obtained. Amorphous
Formation and recrystallization process, heat dissipation effect of reflective layer and recording
The relationship between the linear velocities will be described with reference to FIG. The horizontal axis in FIG.
Is the recording linear velocity, the left vertical axis is the melting and re-solidification of the recording layer
This shows the cooling rate at the time of
Is the critical cooling rate R determined by the recording layer material_cIf larger
The recording layer becomes amorphous, and an amorphous mark is formed. Figure
3, the Sb / Te ratio is represented by Sb₇₀Te
₃₀Be higher than the eutectic point of (Sb / Te ≒ 2.33)
The thing is R_cMeans larger and moves upward
I do. Curve “a” is fixed to a disk having a normal configuration as shown in FIG.
Cooling rate of recording layer when pulse strategy is applied
Represents the linear velocity dependence during recording. Curve b is the same
Only the reflective layer of the disk is changed to a composition with a high heat dissipation
In this case, the heat radiation effect is enhanced. Curve b is above curve a
Is more likely to form an amorphous mark.
Call At high linear velocities, the cooling rate originally becomes amorphous in the recording layer
Critical cooling rate R_cAmorphous formation to be larger enough
The difference in the heat dissipation effect of the reflective layer on the
Degree, the cooling rate of the recording layer decreases as a whole, and R_cNearby
Effect of the reflective layer on amorphous formation
Becomes noticeable. On the other hand, these curves show that the recording layer has the erasing power P
e when re-crystallized between marks by the recording light of e
The reciprocal of the time τ during which the recording layer is maintained at or above the crystallization temperature 1 /
It can also be regarded as the linear velocity dependence of τ (vertical axis on the right side in FIG. 3).
The critical crystallization time τ is determined by the recording layer material.
_cIf larger, ie 1 / τ <1 / τ_cIf non
The crystalline mark will be sufficiently recrystallized and erased.
You. A single period consisting of 3T mark and 3T space
After recording the signal, it consists of 11T mark and 11T space
3T mark when overwriting a single period signal
If the erasing ratio is 25 dB or more, usually 1 / τ <1 / τ
_cIt becomes. In the present invention, overlay at high linear velocity
1 / τ <1 / τ so that sufficient erase_cSatisfied
At the same time, the cooling rate γ at a low linear velocity is γ> R_cSatisfied
Curve c that satisfies the conflicting demands
It is important to have the property, therefore, the composition of each layer and
It is necessary to choose the thickness. Curve c is 4x speed
If less than (4X), the decrease in the cooling rate of the recording layer is compensated.
You can see that Note that the curve c is applied to the medium of the curve b as described later.
Easily achieved when using the preferred pulse division method
Can be achieved. From the above point of view, as a material for the reflective layer
Is Al or Ag which has high thermal conductivity and large heat dissipation effect
It is preferable to use an alloy mainly composed of Reflective layer ratio
Heat is pure Al and pure A for alloys containing Al or Ag as the main component.
g, almost changed by trace element addition and thinning
It is not considered. Therefore, the heat dissipation effect is the heat conduction of the reflective layer.
Depends on rate and thickness. In general, the thermal conductivity of a thin film is determined by the bulk heat
It is very different from conductivity and usually smaller.
And the thermal conductivity is reduced by more than one order of magnitude due to the island structure at the beginning of growth.
Sometimes it gets cheaper. Furthermore, depending on the film formation conditions,
And the amount of impurities are different.
Become a factor. Here, the quality of heat conduction depends on the electrical resistance.
Can be estimated by using
A reflective film having a high thermal conductivity as shown can be defined. metal
Materials in which electrons are mainly responsible for heat or electrical conduction, such as films
The thermal conductivity and the electrical conductivity have a good proportional relationship
Because there is. The electrical resistance of a thin film is determined by its thickness and measurement area.
Is expressed by a resistivity value standardized by the area of. Volume resistivity and surface
The product resistivity (resistivity) can be measured by the usual four-probe method.
Specified by SK 7194. This
Much more than actually measuring the thermal conductivity of the thin film
Data that is simple and has good reproducibility can be obtained. Heat dissipation of reflective layer
The effect is indicated by the product of the thermal conductivity and the film thickness.
The effect can be defined by the sheet resistivity. The present invention
In other words, the area resistivity of the reflective layer is 0.2 to 0.6 Ω / □,
In particular, it is preferably 0.22 to 0.55 Ω / □. A preferable reflection layer has a volume resistivity of 15%.
It has 0 nΩ · m or less, especially 100 nΩ · m or less. one
On the other hand, materials with extremely low volume resistivity are substantially
Usually, it is 20 nΩ · cm or more, because it is difficult to obtain. The thickness of the reflection layer is usually 40 to 300 nm,
Preferably it is 50 to 200 nm. Too thick
Although the drag coefficient can be lowered, sufficient heat radiation effect cannot be obtained.
Not only that, but the recording sensitivity tends to deteriorate. Simply for thick films
Heat capacity per unit area increases, and it takes time
Because the heat radiation effect is rather small
it is conceivable that. In addition, in such a thick film, the time for forming the film is long.
And the material cost tends to increase. Also, the film thickness is small
If too long, the effect of the island structure at the early stage of partial film growth is likely to occur
In addition, the reflectance and the thermal conductivity may decrease. As the material of the reflection layer, an Al alloy or an Ag alloy
Can be mentioned. The material of the reflective layer suitable for the present invention
More specifically, Al, Ta, Ti, Co, C
r, Si, Sc, Hf, Pd, Pt, Mg, Zr, Mo
And at least one element selected from the group consisting of
Al alloys containing These alloys
Is known to improve hillock resistance
In consideration of durability, volume resistivity, deposition rate, etc.
Can be. The content of the above elements is usually 0.1 to 2 atoms.
%, Preferably 0.2 to 1 atomic%. Al alloy
Therefore, if the amount of added impurities is too small, the
However, hillock resistance is often insufficient. Also,
If the amount is too large, it is difficult to obtain the above low resistivity. As an Al alloy, Mn is 0 to 2% by weight,
i is 0 to 2% by weight, Mg is 0.5 to 2% by weight, Ti is 0% by weight.
Al alloy containing up to 0.2% by weight can be used
You. Mn is inevitably mixed in the manufacturing process of Al alloy
Among the harmful elements, for Fe, which is very difficult to completely remove
And Al₆Mn dissolves Fe to form FeAl_ThreePrevent precipitation
To prevent a decrease in corrosion resistance derived from Fe.
It is effective. However, Mn itself is contained in a large amount.
And Al in the reflective layer over time₆Mn precipitates and thermal conductivity
May cause changes over time, so its content is
Usually not more than 2% by weight, more preferably not more than 1% by weight.
You. Si is effective in suppressing fine peel defects,
If the content is too large, the thermal conductivity may change over time.
Therefore, usually 2% by weight or less, preferably 1.5% by weight
The following is assumed. Mg improves the corrosion resistance of the reflective layer
However, the thermal conductivity changes over time due to too much content
2% by weight or less, preferably 1.5% by weight
% Or less. Ti causes fluctuations in sputtering rate
It has the effect of preventing, but if the content is too large, heat conduction
As well as reducing Ti
It becomes difficult to cast the solid solution bulk, and the target cost
Is usually increased to 0.2% by weight or less. Further, as another preferred example of the reflective layer material,
Represents Ti, V, Ta, Nb, W, Co, Cr, S
i, Ge, Sn, Sc, Hf, Pd, Rh, Au, P
selected from the group consisting of t, Mg, Zr, Mo and Mn
Ag alloys containing at least one element can be mentioned.
Wear. When the stability over time is more important,
Preferably, Ti, Mg or Pd is used. Content of the above elements
Is usually 0.2 to 5 atomic%. In the present invention,
By using such a high thermal conductivity reflective layer material,
A relatively thin reflective layer of 300 nm or less,
Resistivity in the range where the resistivity is appropriately small, 0.2-0.6Ω / □
It can be a radiation layer. Addition of impurity elements to Al,
Proportionate to the concentration of addition of impurity element to Ag
Then, the volume resistivity usually increases. Of impurities
Addition generally reduces the crystal grain size and reduces electron scattering at the grain boundaries.
It is thought that the thermal conductivity is decreased by increasing the thermal conductivity. Follow
Therefore, adjusting the amount of added impurities increases the crystal grain size.
Is important to obtain the original high thermal conductivity of the material.
You. The reflection layer is usually formed by sputtering or vacuum evaporation.
It is formed by the method,
Total imperfections, including the amount of pure matter and the amount of moisture and oxygen
It is preferable that the amount of the pure substance is less than 2 atomic%. For this
When forming the reflective layer by sputtering, the process
The ultimate vacuum of the chamber is 1 × 10^-3Less than Pa
Is desirable. Also, 10^-FourAttained vacuum lower than Pa
When forming a film, the film formation rate is 1 nm / sec or more, preferably
Prevents impurities from being taken in at 10 nm / sec or more
It is desirable. Alternatively, one intentional additional element
%, The deposition rate is 10 nm / sec or more
It is desirable to minimize the additional impurity contamination. When the crystal grain size changes depending on the film forming conditions
There is also. For example, about 2 atomic% of Ta is mixed in Al.
In an alloy film, an amorphous phase is usually mixed between crystal grains.
The ratio between the crystalline phase and the amorphous phase changes depending on the film forming conditions. for example
For example, the lower the pressure, the greater the percentage of crystal parts
The product resistivity decreases (thermal conductivity increases). Impurities in the membrane
The composition or crystallinity depends on the alloy target used for sputtering.
It is also used for the production method of sputtering and sputtering gas (Ar, Ne, Xe, etc.)
Dependent. That is, the volume resistivity in the thin film state is a metal material,
It is not determined only by the composition. To obtain high thermal conductivity
It is desirable to reduce the amount of impurities as described above.
On the other hand, pure metals such as Al and Ag are
Because they tend to be inferior to
The optimum composition is determined. In order to obtain higher heat conduction and higher reliability
It is also effective to make the reflection layer multilayer. In this case,
At least one layer has a thickness of 50% or more of the total reflection layer thickness.
It is preferable to use a material having the above low volume resistivity. This layer
Practically controls the heat radiation effect, and the other layers
It is configured to contribute to the improvement of adhesion and hillock resistance.
You. For example, the highest thermal conductivity and lowest volume resistivity among metals
Ag is incompatible with the upper protective layer containing sulfur, and
Degradation is slightly faster when overwriting
There is a direction. In addition, corrosion occurs in an accelerated test environment of high temperature and humidity.
In this case, the reflective layer containing Ag
As an interface layer between the upper protective layer and the reflective layer containing Ag,
It is also effective to provide an alloy layer mainly composed of thin aluminum
It is. As the Al alloy, for example, Ta,
Ti, Co, Cr, Si, Sc, Hf, Pd, Pt, M
g, Zr, Mo and Mn.
Al alloy containing at least 0.2% by atom and less than 2% by atom
Is mentioned. If the thickness of the interface layer is too thin, the protective effect will
Insufficiently, if too thick, the heat radiation effect tends to be insufficient.
So usually 5 to 100 nm, preferably 5 to 50 nm
is there. On the other hand, the thickness of the layer containing Ag is usually 10 to 200 n.
m. If it is too thin, the heat radiation effect may be insufficient.
If it is too thick, erasure tends to be insufficient. Further, the reflection layer containing Ag and the field containing Al
When a surface layer is used, Ag and Al relatively diffuse with each other.
It is easy to oxidize the surface in contact with Ag of Al
It is even more preferred to provide a passivation layer. Interface oxide layer is thick
If it is too much, it becomes thermal resistance, the original purpose, extreme
Function as a reflective layer with high heat dissipation
The thickness is usually 10 nm or less, preferably 5 n
m or less. On the other hand, if it is too thin,
Since the structure may be insufficient, it is usually 1 nm or more.
I do. Such an interface oxide layer forms an interface layer containing Al.
Leave in air for 1 minute to 100 hours after forming
Can be achieved. The multilayer structure of the reflection layer can be achieved by using a high volume resistivity material and a low
A desired area with a desired film thickness by combining volume resistivity materials
It is also effective for obtaining resistivity. That is, for alloying
Volume resistivity is controlled by the use of an alloy target.
The putter process can be simplified, but the target manufacturing cost,
It is also a factor that raises the raw material ratio of the medium.
In some cases, the thin film of pure Al or Ag may be
Obtain the desired sheet resistivity by multilayering the elemental thin film
It is effective. If the total number is up to about 3 layers,
Equipment costs increase, but individual media costs
In some cases, it can be suppressed. In the present invention, the compatibility with a CD is further improved.
It is necessary to consider the configuration of the groove provided on the substrate to secure
It is necessary. The track pitch of the groove is usually 1.6 μm ± 0.
It is about 1 μm. The depth of the groove is usually 30 to 45 nm.
However, it is particularly preferably about 30 to 40 nm. Groove depth
Is too large, the push-pull value after recording will increase.
Tends to be too much. Also, the radial contrast after recording
Default value becomes too large compared to the value before recording,
There may be problems with qualification. On the other hand, if the groove depth is too small,
Trust book and push-pull value are orange book part
3 below the lower limit of the CD-RW standard.
There is. Also, the effect of confining the recording layer by the groove wall is low.
Deterioration due to repeated overwriting
It is in. Furthermore, if the groove depth is too shallow, stamper manufacturing
Also, it becomes difficult to form the substrate. Within the above range
Therefore, the reflectivity in the groove becomes sufficiently high, and the CD-RW standard
15%, which is the lower limit of
The amplitude PPa of the push-pull does not become too large.
Gain of push-pull detection circuit even in uneven pit reproduction circuit
Can be reduced. Groove width
Is usually 0.4 μm or more, preferably 0.45 μm or more
And usually 0.6 μm or less, preferably 0.55
μm or less. Radial after recording if the groove width is too small
Meets the standard value of the absolute value of contrast being less than 0.6
It becomes difficult to do. Also, if it is too big, the existence of wobble
The resulting deterioration of overwrite durability becomes remarkable.
There is a tendency. It is to be noted that durability degradation is promoted by the presence of wobbles.
Although the mechanism of advance is not always clear,
In order for a part of the beam to be easily irradiated to the side wall of the groove,
It is thought that there is not. That is, the tracking servo
The focused light beam does not follow the wobble meandering
To go straight through the center, if there is a meandering groove wall,
The beam is slightly irradiated to the groove wall.
Stress concentration occurs at the groove wall and groove corner where the thin film adhesion is poor.
Due to thermal damage during repeated overwriting due to pans, etc.
Light beam
It is thought that if even part of
You. In general, deep grooves and narrow grooves are used for recording in a groove of a phase change medium.
Tend to be more durable,
If the groove width is too narrow,
It is considered that the deterioration phenomenon of the part becomes remarkable. The groove width and the groove depth are, for example, 633 wavelengths.
Light by U-groove approximation by He-Ne laser light of nm
It can be determined by chemical diffraction. In addition, scanning electron microscopy
The groove shape can be measured with a mirror or a scanning probe microscope.
Wear. In this case, the groove width is usually set at half the groove depth.
It is better to use a value. The optical recording medium of the present invention will be described later.
Such a recording by the CAV method is possible. That is, the book
The medium of the present invention is designed so that the data recording is performed at the radius of the recording area.
It can be performed with the rotation speed constant regardless of the position. This
In the case of, reproduction can also be performed at a constant rotation speed
However, preferably, recording and reproduction are performed at the same rotational speed. [0077]4. General recording method In the present invention, the rewritable optical recording medium
At least 8x speed, especially 8x and 10x speed, or
8x speed and 4x speed, and 4x speed, 8x speed and 10x speed
It is preferable to perform recording at a high speed. In this case,
Overwriting can be performed by the simple pulse division method (I).
it can. As a result, compatibility with existing CD playback systems
However, it is possible to record a good signal. That is, EFM transformation
Key information recorded with multiple mark lengths
When the time length of one recording mark is nT
(T is a reference clock cycle, n is an integer from 3 to 11),
Between recording marks, an erasing pattern that can crystallize amorphous
The recording light of the power Pe is irradiated, and the recording mark is
Of the time length (n−j) T of α₁ T, β₁ T, α_Two T, β_Two T, ..., α_mT,
β_mT, Where m = n−1 or m = n−2 in order._i(Α_i
+ Β_i) = N-j (j is a real number satisfying 0.0 ≦ j ≦ 2.0)
Split so that Α_iRecording within the time T (1 ≦ i ≦ m)
Pw> Pe, preferably Pw = Pe, to melt the layer
The recording light with a recording power Pw of /0.3 to Pe / 0.6
Irradiate, β_i0 <Pb within the time T (1 ≦ i ≦ m)
Irradiating recording light with a bias power Pb of ≦ 0.5 Pe
To perform overwriting. M in this pulse division method
= N-1, the power specified in the current CD-RW standard
It is equivalent to overwriting by the Rus division method
This is preferable for compatibility with existing circuits. In the above description, the length of the mark to be formed is
Section jT can be set for accurate control
You. The interval jT is usually the beginning of the divided pulse and / or
Added to the end, during which recording light of erasing power Pe
Is irradiated. Bias power Pb is required for reproduction of reproduction light
It is preferably substantially the same value as the reproducing power Pr,
Normally, the value is 1.5 mW or less, particularly 1.0 mW or less.
You. As long as there is no problem with focus or tracking servo
As close as possible to 0, the Pb irradiation section (off-path
Quenching effect of the recording layer in the
New Note that the values of Pw, Pe and Pb are not always the same.
It does not need to be constant, for example, V_Tendegree
To stabilize the operation of the laser
Can be Pw, Pe and Pb in this case are
These are the average values. FIG. 1 illustrates the above pulse division method.
It is a figure, (a) mark length modulation data and it is recorded
When m = n−1 in (b),
(C) shows the case where m = n−2. (B), (c)
Then, T to be applied after α and β to simplify the figure
Is omitted. In the above recording method, at least m =
If overwriting is possible at n-1, CD-R
Good overwriting while maintaining compatibility with W standard
I can. That is, the EFM modulation signal was overwritten.
The subsequent signal characteristic is the modulation degree m described above.₁₁Is more than 60%
Compatible with CDs when the measurement is near 0, and further playback
The jitter of each mark and inter-mark (space) of the signal is 3
5nsec or less (at 1x speed playback), and mark length and
The interval between peaks is almost nT × V (T is the data reference clock cycle.
Period, n is an integer from 3 to 11, V is the linear velocity during playback)
It is possible to maintain a recording quality having a length. this
Is actually a commercially available C-RW disc
D-ROM drive can play back at low error rate
Means In the above description, the measurement of the jitter
After passing the signal through the high-pass filter, the center of the signal amplitude
The threshold value is used as a threshold value to detect and detect the mark length in the DC slice.
For the media of the present invention, preferably m = n-1 and m =
Over any of n-2 pulse division methods
Write. The medium of the present invention can be used as described below.
It can be recorded at various linear velocities. At this time,
However, usually, a mark having a length of nT is divided into a plurality of pulses and recorded.
Irradiate recording power Pw and bias power Pb alternately
The pulse division method as shown in FIGS. 1B and 1C is adopted.
The optimal value of the parameter that determines the specific method
Generally varies depending on the linear velocity. Therefore,
For a bright medium, the optimum recording power P according to the recording linear velocity
w₀, Optimal erasing power Pe₀, Optimal bias power Pb
₀And α_i(I is at least one of 1 to m), β_i(I is 1
To at least one of m), pulse division information such as division number m
It is recommended that at least one of the
Good. The recording medium of the present invention is 4
Overwrite at any linear speed from double speed to 10 times speed
Characteristics can be determined almost uniquely. That is, in FIG.
4 times the curve c, taking into account the recording pulse strategy
Cooling speed required for the medium, defined at 10 times speed
Degree Rc and the retention time τ for crystallization almost
It is nothing more than a decision. Then, at least between 4 and 10 times speed
Any linear speed, preferably any linear speed up to 1x speed
A conventional CD-R as a rewritable optical recording medium.
At the same time that good playback becomes possible with a W playback system
Should be easily compatible with media and drives
Can be. [0083]5. Recording method by CLV method Next, a recording method according to a third aspect of the present invention will be described.
I do. As described above, conventionally, high-speed recording has been performed in CD-RW.
One of the reasons why recording could not be performed was that the CD-RW standard
Is a strict recording pulse strategy (pulse division method)
I mentioned what was stipulated. That is, CD-RW rules
Case Orange Book Part 3, version 2.0,
From the 4x speed with the recording pulse strategy shown in FIG.
A wide range of linear velocities from 8 to 10 times speed or higher
Must be recorded. However, phase change media
The mark length modulated information is stored in multiple mark lengths and marks.
When recording by interval length, generally a fixed recording pulse
In the strategy, the ratio of the maximum used linear velocity to the minimum used linear velocity is
The limit is about twice. Therefore, the recording method of the present invention is 1 to 10 times
Constant linear velocity over a wide range of linear velocity
CLV (constant linear velo)
(City) method, the above pulse
The following three types of pulse division methods according to the division method (I)
Apply according to the linear velocity. Rewriting with phase-change recording layer
EFM-modulated information on multiple optical recording media
One record when recording by length and mark length
Assuming that the time length of the mark is nT as described above,
Between the peaks, the erasing power P that can crystallize the amorphous phase
e, irradiate the recording light of e.
The time length (n−j) T of α₁ T, β₁ T, α_Two T, β_Two T, ..., α_mT,
β_mT, (However, m = n-1 or m = n-2)_i
(Α_i+ Β_i) = N−j (j is 0.0 ≦ j ≦ 2.0)
(Real number)_iWhen T (1 ≦ i ≦ m)
Pw> Pe for melting the recording layer within the interval, preferably
In other words, the recording power where Pw = Pe / 0.3 to Pe / 0.6
Irradiate recording light of Pw, β_iTime T (1 ≦ i ≦ m)
Within the range of the bias power Pb satisfying 0 <Pb ≦ 0.5 Pe
Overwrite by irradiating the recording light,
1.2m / s to 1.4m / s as the reference speed (1x speed)
And 231 ns is the reference clock cycle at that time.
Come (1) At 4 × speed, α₁ = 0.3-1.5, α_i
= 0.2-0.7 (2 ≦ i ≦ m), α_i+ Β_i-1 = 1
1.5 (3 ≦ i ≦ m). (2) At 1 or 2 × speed, α₁ = 0.05-1.
0, α_i= 0.05-0.5 (2 ≦ i ≦ m), α_i+ Β
_i-1 = 1 to 1.5 (3 ≦ i ≦ m). (3) At any of 6, 8, 10 and 12 times speed
And α₁ = 0.3-2.0, α_i= 0.3-1 (2
≦ i ≦ m), α_i+ Β_i-1 = 1 to 1.5 (3 ≦ i ≦ m)
And In the above recording method, each linear velocity
And α_i(2 ≦ i ≦ m) and / or α _i+ Β_i-1 (3 ≦
i ≦ m) takes a substantially constant value regardless of i.
Is preferable, and as a result, a simple
A source generation circuit can be used. In that respect,
In each of the above linear velocities (1) to (3), α_i+ Β_i-1But
2 ≦ i ≦ m, preferably constant at about 1 regardless of i
No. Also, the leading pulse α₁The subsequent pulse α_i(2 ≦ i
≦ m), especially α_i/ Α₁= 0.3-0.
7, preferably 0.4-0.7, 3T, 4T, etc.
Short marks and long marks of 5T or more
Record in the peak length, and make the asymmetry close to zero.
it can. This is particularly effective at 4 times speed or higher. Up
In each of the linear velocities (1) to (3), β₁ And β_mIs German
It can be selected as a stand-alone parameter and can be varied.
The values are each preferably 0 to 1.5, more preferably
Or 0.25 to 1.25. Also, Pw, Pe,
And Pb need not always be constant, for example,
α ₁T or α_mThe power P of the recording light applied to the section T
w and α_iRecording to irradiate a section T (i = 2 to m-1)
The light power Pw may be different from the power Pw. The division number m of the recording pulse is as described in the above (1) to (4).
At each linear velocity in (3), either n-1 or n-2
This may be selected, but is shown in FIG.
As shown in FIG.
As shown, the number of divisions m
Can be changed according to the linear velocity. The above description of the present invention
In the recording method, at each linear velocity used, the recording pulse
Width α_iT (i = 1 to m) and off-pulse section β_iT (i
= 1 to m-1) are 10 ns or more, especially 15 ns.
It is desirable to be no less than no seconds. α_iT or β_iT is small
Too much, the recording laser in the current ordinary recording device
-Rise and fall times are at least a few nanoseconds
Is necessary, making accurate control of the pulse difficult.
Sometimes. Therefore, the reference clock cycle T is 12 times faster.
19.3 ns, especially 10x speed
It is preferably up to 23.1 ns. In addition, off pulse
Section β_iIf T (i = 1 to m-1) is too small, the recording layer
Cooling rate may be insufficient. The current CD-RW medium is accurate at 4 × speed.
The recording pulse division method (α₁ = 1, α_i= 0.5
(I = 2 to m), α_i+ Β_i-1 = 1 (i = 2 to m), β
_m= 0.5) If you can't record a CD compatible signal
No, but please add a correction of about ± 0.3T on the recording device side.
Good properties can be achieved without significant equipment improvements
Noh. Therefore, at 4 × speed, as shown in (1)
α₁ = 0.75-1.25, α_i= 0.2-0.7 (2
≦ i ≦ m), α_i+ Β_i-1 = 1 to 1.5 (3 ≦ i ≦
m). 1 or 2x speed which is lower than 4x speed
In the above, α in (2) above₁ = 0.05-1.0, α_i
= 0.05-0.5 (2 ≦ i ≦ m), α_i+ Β_i-1 = 1
To 1.5 (3 ≦ i ≦ m, preferably 2 ≦ i ≦ m)
By adopting a pulse division method, the recording pulse Pw
The width is reduced and the accompanying off-pulse Pb irradiation section (off-pulse
Recording section cooling at low linear velocity
Suppress the decrease in speed and re-solidify the molten recording layer at low linear speed.
Suppresses recrystallization during solid time,
Amorphous marks having almost the same width and length can be obtained. The linear speeds 6, 8, 10 and 4 which are higher than the quadruple speed
At any linear speed of 12-times speed, α in (3) above
₁ = 0.3-2, α_i= 0.3-1 (2 ≦ i ≦ m), α
_i+ Β_i-1 = 1 to 1.5 (3 ≦ i ≦ m, preferably 2 ≦
i ≦ m), the recording is performed by using a pulse division method.
Pulse α_iThe width of T is increased, and the recording layer melts at high linear velocity.
By providing sufficient recording power for fusion,
Amorphous mask with almost the same width and length as 4x speed overwrite
Work. Here, the method of (3) is not limited to 10 times speed.
Applicable to the above linear velocities, but at higher linear velocities the relative
The reference clock cycle becomes shorter,
Normal control is usually 20x speed because accurate control may be difficult.
Or less, preferably 12 times or less, more preferably 10 times
Applies to linear velocities below speed. Set the division number m to any linear velocity
Even if it is constant at m-1 or n-2₁ = About 1, α
_i= 0.3 to 0.6 (2 ≦ i ≦ m), and α_i
+ Β_i-1 (3 ≦ i ≦ m, preferably 2 ≦ i ≦ m)
And lower linear velocity α_iMonotonically decreases (but only
(I is an integer of 2 to m) is preferable for simplification of the circuit.
No. Also, at any linear velocity used, α₁T and
And α_iT (i = 3 to m) and α_i+ Β _i-1 (Where i is
(An integer of 3 to m) is more preferably made constant. here
α_iIs preferably about 1, but about 0.9 to 1.1
It should just be in the range of. In the recording method of the present invention, β_mIs
A constant value may be used at any linear velocity._i
(I = 1 to m) or β_i(I = 1 to m-1) is fixed
Leaving β_mOnly at the higher linear velocity.
It is also preferable to cut. In this case, on the high linear velocity side, β_m
= 0. Note that the pulse generation times on the recording device side
In order to simplify the road, m is n-
It is desirable to unify with either 1 or n-2. 4
At high linear speeds exceeding double speed, the data reference clock period T
Apply the same pulse division method as 4x speed
For example, at 8 × speed, usually 0.5T ≒ 15n
sec, 10T speed is 0.5T ≒ 12nsec,
The recording laser pulse generation circuit must be extremely fast
It is difficult to follow. Therefore, at a linear velocity exceeding 4 × speed,
Sets the pulse division number to m = n-2 and increases each pulse width.
Then α_i+ Β_i-1 (3 ≦ i ≦ m) is about 1 to 1.5
Then α₁From 1.2 to 2, α_i0.5 to 1.0 longer
Preferably, the response speed of the recording laser is preferable. In particular
It is effective at 8 times speed or higher. Normally, 4x speed or less
Is preferably Pe / Pw = 0.3-0.6 at the same linear velocity.
Or keep the Pe / Pw ratio constant in the range of 0.4 to 0.6
Wider recording power mer by setting Pe and Pw
Gin can be obtained. However, at linear speeds higher than 4x speed,
Pe and Pw are set independently, and optimum power is obtained at each linear speed.
Sometimes it is better to decide. 4x speed or higher
Optimum value Pw of Pw_oIn order to decide
Test writing was performed with the recording light of recording power Pw, and FIG.
Asymmetry value and degree of modulation m₁₁Is within a predetermined range
Optimal recording power Pw with recording power Pw_oTo do
Can be. In this case, the obtained optimum recording power Pw_o
The actual recording is performed by using the recording light. Note that the above
Suitable recording power Pw_oThe asymmetry value to determine
Modulation degree m₁₁The range of
To be written on the medium as a signal
it can. Note that a preferred embodiment of the recording method of the present invention is
In order to simplify the pulse division circuit,
At least 8x speed, and in some cases up to 10x speed
Use the Ruth division method. Specifically, the division number m is n-1
Alternatively, it is fixed at n−2. More preferably α_i(I is 1
To an integer m) is the same at any linear velocity. This
At any linear velocity, α_i+ Β_i-1(I = 2
To m) is 1 and α_iIt is particularly preferable that
Good. FIG. 5 shows a pulse generation method in the recording method of the present invention.
It is explanatory drawing of an example of a method. (A) is a clock signal,
(B) is a mark length modulated data signal,
(C), (d) and (e) show the values of 3 in the recording pulse generation circuit.
Gate signal generated from a kind of gate generation circuit
1, Gate2 and Gate3. These three games
By determining the priority of the
A division method can be achieved. Gate 1 is a recording pulse generation section
Interval α₁ T only, Gate 2 is the subsequent pulse α_iT (2 ≦
i ≦ m) is determined at a predetermined timing. This
Where the pulse width α _iIs a constant value α at 2 ≦ i ≦ m_cToss
You. Gate 3 is an off-pulse generation section β _iGenerate T
You. Pb is generated while Gate3 is on (high level)
Then, Pe is generated during the off state (low level). Α₁ Only the rising timing is independent
To decide, β₁ To β_iCan be different from
Wear. Synchronize the rising of Gate3 and Gate1
Is good. Gate1 and Gate2 each have Pw
However, when Gate 1 and Gate 2 are on, Gate
Take priority over 3. Gate1 delay time T₁ And α₁ , Ga
te2 delay time (T ₁ + T_Two ) And α_cIf you specify
By specifying the pulse strategy in the recording method of the present invention
Wear. Where T₁ Is 1T or more, if FIG.
It becomes a pulse when m = n-1 and it is succeeded as less than 1T
If the number of pulses is reduced by one, m = n−2 in FIG.
It becomes a pulse in the case. Or β_m-2≧ 1.0
You may do it. In this case, β₁ Is α₁ , T₁ And T_Two Pair of
By combination, β_mIs independent at the end of Gate3
Can be treated as a parameter. In FIG. 1 (c), α
_i+ Β_i-1 To generate = 1 to 1.5, generate at Gate2
Let α_iIs 1 to 1.5. α
_i(I = 1 to m) and the like represent the data reference clock T or
Is synchronized with the base clock of 1/2, 1/4, etc.
By generating the reference clock T at a predetermined multiple,
Easier actual pulse width by following changes in T according to linear velocity
Can be changed to The recording method described above is widely used for CD-RW media.
Although generally applicable, the first or second aspect of the present invention
When used for media related to
This is preferable because the performance is improved. In particular, recrystallization at high linear velocity
Combination of a high-speed recording layer and a layer configuration with particular attention to thermal effects
Combined, α at 1x speed_iGood T when T is 10 nanoseconds or more
It is desirable that bar lights can be used. More preferred
K is α_iGood overwriting when T is 15 nanoseconds or more
It is possible. The reason is that at 1x speed of low linear speed,
Interval β_iT is increased and the recording pulse section is α_iShorten T
However, at 1x speed, the minimum is 0.05T ≒ 12nsec.
More than this_iThis is because it is difficult to shorten T. [0096]6. Recording method by CAV method Next, a recording method according to the fourth and fifth aspects of the present invention.
The method will be described. This is only in the conventional CLV mode
CD-RW that has been recorded can be recorded in CAV mode
Function, which always requires rotation synchronization
Access and seek, which are the weak points of CD-RW media
It significantly improves poor performance. Special
In the random packet recording,
Access to the computer efficiently
The convenience as a medium for an external storage device is greatly increased. Ma
In addition, in CLV, the motor acceleration and
It consumes a lot of power for deceleration, but it is not necessary
There is also an advantage that the power consumption of the drive can be greatly improved. The CD-RW is usually a disc having a diameter of 12 cm.
With a radius of at least 23 mm to 58 mm,
Preferably, the recording area (information
Area). This is quadrupled at the innermost circumference of the recording area.
Rotate the disk at about 2000rpm to be equivalent
The linear velocity is 58 mm at the outermost circumference of the recording area.
It becomes almost 10 times speed. That is, the innermost circumference in the normal CAV method
Is set to 4 × speed, the outermost circumference becomes approximately 10 × speed. This and
And the data reference clock period T is a line at each radial position.
Inversely proportional to radial distance so that product VT with velocity V is constant
The mark length nT is one regardless of the rotational angular velocity.
And compatible with CD while recording in CAV mode
A certain linear density can be recorded. Here, the recording area
Used by the system other than the user data recording area
Includes test writing area, lead-in area, lead-out area, etc.
No. Therefore, at the radial positions of 22 mm and 58 mm,
In addition, an error of about ± 1 mm may be included. Ma
The frequency value used below corresponding to this tolerance
Etc., a slight shift occurs, which is also acceptable. Recording apparatus for realizing the recording method according to the present invention
FIG. 6 is a conceptual diagram showing an example of the configuration of FIG. In FIG.
The optical disc D1 has a carrier frequency f with a constant spatial frequency._L0To
Meandering according to the signal modulated by the address information
Having a substrate having a spiral groove formed therein and a recording layer,
A record that is a unit of record information at a predetermined position of a spiral groove
Address information for identifying a block and start of the block
It has a synchronization signal for identifying the position. In FIG.
Rewritable compact disc as optical disc
Is assumed, f_L0= Address information at 22.05 kHz
Is f_L0Is frequency-modulated at ± 1 kHz with the carrier frequency
ATIP information. The wobble has a linear velocity of 1.2.
When reproduced at a linear velocity of m / s to 1.4 m / s,
Carrier frequency f _L0Meandering so as to be 22.05 kHz
Is formed by The optical disk recording / reproducing apparatus 1
It is a means to rotate at a constant angular speed around the center of the
A spindle motor M1 and a focused light beam for recording / reproduction.
Move the optical pickup that generates the beam to the specified address
Linear motor as the radial moving mechanism (LM1)
Data. The pickup PU1 has an optical disc
Focused laser beam with a laser diode as the light source
Focus servo circuit (FE1)
Scanning the focused light beam along the spiral groove.
Groove tracking servo circuit (TE1)
ing. The focus servo circuit includes the astigmatism method,
A known method such as the Ue method is used. Tracking server
Known methods such as push-pull method and three-beam method
(The above, "Compact Disc Reader" 3rd
Edition, see Ohmsha, Heitaro Nakajima and Hiroshi Ogawa) The optical disk recording / reproducing apparatus 1 further includes a groove
Row to carrier frequency f_A0, Address information and block synchronization
A circuit (WAD1) for detecting and decoding a signal;
Clock start position and data reference clock T (frequency f
_d0) In synchronization with encoders ED1 and ED2.
A circuit for generating a recording data sequence modulated with a peak length,
For modulating the recording laser power according to the recording data sequence
Road (WP1). The optical disk D1 is a motor M
1 is CAV driven. Discs, especially, semi
A linear velocity of 1.2 m at the innermost circumference of the recording area with a diameter of about 22 mm
/ S to 1.4 m / s 4 times speed, more preferably 1.2 m / s
1/2000 rpm so as to be 4 times as fast as / s
Rotation speed ω during₀CAV rotation. CAV times
The rotation of the spindle motor M1 is monitored by a tachometer.
And feed back the error with the specified speed.
Thus, the rotation jitter is maintained with an accuracy within several%. Push through the amplifier / filter system AF1.
Reproduce the sprue signal P1, detect the wobble signal,
The synchronization signal and the address included after decoding the TIP signal
Decode the dress information. Address information and synchronization signal
The access / servo control CPU 1 refers to the CPU
In step 1, a predetermined address is controlled. Address move
Is the linear motion with the tracking servo TE1 turned off.
Radial movement by the coarse movement mechanism driven by the motor LM1;
Tracking servo on near predetermined address, ATI
Fine adjustment while referring to P address (PU1 objective lens
The fine adjustment of the inclination of the
It is. It has been confirmed that the specified address has been reached.
For example, the clock of the circuit CK1, which is the data reference clock generator,
Synchronize the lock and ATIP synchronization signals, and
Recording is performed on the P frame. CD-ROM data
For example, after encoding the ROM data with ED1,
Encoding as a CD is performed by ED2. The database
The bit sequence is still synchronized with the data reference clock,
The data train is further transformed into a recording pulse train in WP1.
Is over-driven by driving the laser driver LD1.
Write. Note that the reproduction is started after the arrival at a predetermined address.
Signal through the amplifier system AF1 and the RF signal binarization circuit system RF1.
And reproduce the data, the reference clock of the data and the EFM frame.
Data synchronization as CD with ED2 while synchronizing
The data as CD-ROM on ED1.
Performs data decoding. By the way, when recording in CAV mode,
As an optical recording method by pulse division, the pulse division method
The following two types according to the method (I) can be used.
First, a rewritable disc-shaped optical recording having a predetermined recording area
By rotating the medium at a constant angular velocity, the EFM-modulated information is
A method of recording with a plurality of mark lengths, wherein a linear velocity is 1.
Record 2m / s to 1.4m / s as reference speed (1x speed)
The linear velocity at the outermost circumference of the recording area will be at least 10 times faster
Rotate the disk to
When the length is nT (T is a reference clock cycle,
The product VT with the linear velocity V at that radial position becomes constant
As described above, T changes according to the radial position. n is 3 to 11
Amorphous between the recording marks
Irradiating a recording light with an erasing power Pe that can be
, The time length (n−j) T of α₁ T, β₁ T, α_Two T, β_Two T, ..., α_mT,
β_mT, (However, m = n-1, α₁ = 0.75-1.25, α_i= 0.25-0.75 (2 ≦ i ≦ m,), α_i+ Β_i-1 = 1 to 1.5 (3 ≦ i ≦ m,)) in order._i(Α_i+ Β_i) = N
−j (j is a real number satisfying 0.0 ≦ j ≦ 2.0)
Split Α_iRecording within the time T (1 ≦ i ≦ m)
Pw> Pe to melt the layer, preferably Pw = P
recording light with a recording power Pw of e / 0.3 to Pe / 0.6
And β_i0 <P within the time T (1 ≦ i ≦ m)
Irradiation of recording light with bias power Pb where b ≦ 0.5 Pe
And perform overwriting, and at any radius position
Also α₁ , And α_i+ Β_i-1 (I = 3 to m, preferably
i = 2 to m) is constant and α_i(I = 2 to m)
This is a method of monotonously decreasing. That is, the number of pulse divisions is fixed to m = n−1.
And α₁ Is a value between 0.75 and 1.25, and α
_i(I = 2 to m) is set to 0.25 to 0.75, and α_i+ Β
_i-1 (I = 3 to m) is set to 1.0 to 1.5, and
These are fixed regardless of the radial position. by this,
Only the reference clock period T with a simple circuit as shown in FIG.
The recording pulse can be easily generated by changing
You. Where α_i(I = 2-m) and / or α_i+ Β
_i-1(i = 3 to m) is preferably a constant value regardless of i
No. Also, α₁Is also fixed at a fixed value, especially 1.
Good. α₁= 1 and α_i+ Β_i-1 = 1 (i = 2
m), all recording pulses α_iT (i = 1 to
m) is generated in synchronization with the reference clock T,
The pulse generation circuit can be further simplified. This recording method is performed at 4 to 10 times speed.
The present invention capable of overwriting in a wide linear speed range
Especially when applied to rewritable compact discs
Good recording and reproduction can be performed. When recording in CAV mode
The second optical recording method is a rewritable type having a predetermined recording area.
Rotate the compact disc at a constant angular velocity to change the EFM
This is a method for recording adjusted information with multiple mark lengths.
Therefore, the linear speed of 1.2 m / s to 1.4 m / s is set to the reference speed (1
Double speed) and the linear velocity at the outermost periphery of the recording area is at least 1
The disk is rotated so that the speed becomes 0 times, and one recording is performed.
When the time length of the mark is nT (T is the reference clock
And the product V with the linear velocity V at the radial position
T changes according to the radial position so that T is constant.
You. n is an integer from 3 to 11), and between recording marks
Illuminates recording light with an erasing power Pe that can be crystallized as amorphous.
For the recording marks, the length of time
(N-j) T is α₁ T, β₁ T, α_Two T, β_Two T, ..., α_mT,
β_mT, (However, m = n-1, α_i/ Α₁= 0.3-0.7,
Especially α_i/ Α₁= 0.4 to 0.7 (where i is 2 to m)
integer), α_i+ Β_i-1 = About 1 (3 ≦ i ≦ m)) in order._i(Α_i+ Β_i) = N-
j (j is a real number satisfying 0.0 ≦ j ≦ 2.0)
And Α_iRecording within the time T (1 ≦ i ≦ m)
Pw> Pe to melt the layer, preferably Pw = P
e / 0.3 to Pe / 0.6 recording power Pw (> P
e) and irradiate β_i0 within the time T (1 ≦ i ≦ m)
The recording light having a bias power Pb satisfying <Pb ≦ 0.5 Pe
Irradiate and overwrite, and in any radius position
Α_iT (i = 2 to m) and α_i+ Β_i-1 (I = 3
To m, preferably i = 2 to m).
You. In this case, α_iIs constant regardless of i (2 ≦ i ≦ m)
Then α_i+ Β_i-1 Is constant between 1 and 1.5 regardless of i
(3 ≦ i ≦ m), and α₁ T, α_iT (i =
2 to m), α_i+ Β_i-1 (I = 3 to m) regardless of the linear velocity
More preferably, it is fixed. α_iFor T, linear velocity
Constant time T independent of_topAnd constant α₁′
And α₁T = T_top+ Α₁'T. α₁ T, α
_iTo make T (i = 2 to m) constant regardless of the linear velocity
Is that the product of T and T increases monotonically as the linear velocity decreases.
So that α is constant₁ , Α_iMonotonically decreases at lower linear speeds
Achieved with less. As a result, the lower the linear speed
The cooling rate of the recording layer can be increased and the pulse
The generation circuit is simple. The second recording method
In the law, "α₁T or α_iT (i = 2 to m) is constant
Means that the resolution of the set value of the divided pulse generation circuit is
About ± 10%
Is acceptable. In both the first and second methods, β_m
May be constant or changed irrespective of the linear velocity. Strange
The lower the linear velocity, the β_mIncrease
It is preferred that More preferably, virtual in the radial direction
Divided into multiple zones, β_mChanges for each zone
Let it. Especially β_mWithin the range of 0 to 1.5, immediately
The lower the linear velocity zone, the monotonically larger
Preferably thereby cooling the recording layer at low linear velocity
A decrease in speed can be prevented more effectively. This place
If β _mIs too large, even at relatively low linear velocities
Incomplete erasing of the area between marks following the trailing edge
is there. β_mRealizes the above pulse strategy to change
In order to achieve this, in FIG.
(Including adding a fixed delay) width α₁ T's solid
One fixed-length pulse (Gate1) and the following width α_iT
Multiple (i = 2 to m) fixed-length pulses (Gate 2)
Gate3 that determines the final off-pulse length while generating
Only the linear velocity needs to be changed. In addition,
As described in the description of the second aspect of the invention,
Α even at the radial position of the deviation_iT (i = 1 to m) and β
_iIt is preferable to set T (i = 1 to m-1) to 10 ns or more.
Good. In the above first and second methods,
-Β at maximum linear velocity during light _mTo β_Hm, Lowest linear velocity
Β in degrees_mTo β_LmAs each overwrite line
Β in speed_mTo β_LmAnd β_HmFrom the value of
It is preferred that Also, Pb, Pw and Pe / P
The w ratio should be constant regardless of the linear velocity during overwriting
Is preferred. In this case, information and recording power
Loose division information is recorded on the disc in advance by
Is preferably described as a groove deformation signal. The result
As a result, automatically select the optimal pulse strategy
Can be. As information to be described, for example, Pe /
Pw ratio, optimum recording power Pw₀ , Optimal erasing power Pe
₀ , Optimal bias power Pb₀ , Α₁ , Α_i, Α₁ T,
α_iT, α_i+ Β_i-1 , Β_Lm, And β_HmAll or one of
It is the numerical value of the part. Here, the recording power information is an absolute value.
Optimal recording power Pw₀ And Pw₀ Decide
Parameter that is referenced in the trial writing
There may be. In the recording method of the present invention, the distance
Reference clock and reference clock period T of proportional data
There are various methods for generating the
The following (i) to (vii) can be considered. Here CL
Wobble carrier frequency f at 1x speed of V mode_LOIs about 2
2.05kHz, innermost circumference of recording area in CAV mode
And the linear velocity at the outermost circumference are 4x speed and 10x speed,
Data reference clock is 196 times the carrier frequency.
Will be described as an example. Here, the carrier frequency f_LOIs 2
An error of about ± 0.1 from 2.05 kHz can be tolerated. [Method of Generating Data Reference Clock]
(I)] The medium has the frequency f_L0= About 2
A wobble having a carrier frequency of 2.05 kHz is provided.
With a spiral groove. This medium is a normal CLV mode.
CD-RW media for high-speed recording
You. The wobble of the wobble groove (meandering groove) is the carrier frequency f_L0
= Constant at a frequency equivalent to about 22.05 kHz,
At the time of CAV rotation, according to the radial position, that is,
Carrier frequency of wobble reproduced according to the corresponding linear velocity
Number f_AOChanges in appearance. And at the time of CAV rotation
Carrier frequency f of wobble reproduced at radial position_A019
By multiplying by six, the reference data clock cycle proportional to the radius
The wave number can be obtained. The data reference clock cycle proportional to this radius
If recording is performed in synchronization with the wave number, CAV mode
Mark length modulation recording at a constant linear density.
You. That is, the wobble signal is in the 1 × speed mode of the CLV rotation.
If the media is written on the substrate, CAV
The same magnification regardless of the radial position.
Generate a reference clock frequency to keep the spatial frequency constant
That is, the linear density can be kept constant. example
If the linear velocity at the innermost circumference of the recording area is 4x,
If the linear velocity in the circumference is 10 times faster, playback in CAV mode
Wobble carrier frequency f_A0Is the recording area
Approximately 22.05 × 4 = 88.2 KHz at the innermost circumference, recording area
About 22.05 × 10 = 220.5 kHz at the outermost circumference
You. This is 196 times the frequency, about 17.287 MHz
(The innermost circumference of the recording area) and about 43.218 MHz (the recording area
(The outermost area) is the reference clock frequency of the data. this
In this case, the data reference clock cycle T is the innermost circumference of the recording area.
About 57.8 ns, about 23.1 ns at the outermost circumference of the recording area
ec. At intermediate radius positions, the radius
Generate a reference clock cycle of data that is inversely proportional to
Good. On the other hand, the wobble signal is usually an ATIP signal
Frequency is modulated at ± 1kHz by the actual frequency
The number is 22.05 kHz ± 1 kHz and the wobble signal
Is associated with about ± 4.5% variation. Like this
Multiply the current signal by a specified value and
In addition, when the clock cycle is obtained, the mark length is also ± 4.5%.
Deviation occurs. Usually marked
In a long record, this fluctuation is called a phase shift.
If the shift amount is close to 5%, correct demodulation may not be performed.
is there. Therefore, in such a case, frequency modulation is performed.
Carrier frequency f from the wobble signal_A0Extract only
It needs to be multiplied by a certain number. The method is described below. First
As usual, rotate the disc while pushing
The wobble signal is reproduced by detecting the wobble signal. f_A0Is mentioned above
Innermost radius R_inTo outermost radius R_outNiwatta
132.3 from 88.2 kHz to 220.5 kHz
kHz, and the reference clock of the data changes accordingly.
Also changes from 17.287 MHz to 43.218 MHz
Become (Repetition frequency of 11T mark and space
Varies from about 786 kHz to 1.96 MHz
). Then, the above f_A0Including as much as possible
Use a narrow band filter or low-pass filter to
Cuts data components mixed with the sprue signal. Next
The radius R at which the pickup moving in the radial direction is located
Is obtained from the drive train, synchronized with this, and approximately f_A0
Frequency f for predicting_R0(KHz) into the following equation
Therefore it is generated.   f_R0= 88.4 + 132.3 x (RR_in) / (R_out-R_in(3) And the predicted frequency f_R0The reference frequency in a small area around
Carrier frequency f while sweeping_A0Extract (tune)
The carrier frequency f_A0Can be easily detected. 1
By multiplying by 96, the reference data according to the disc radius
The clock is obtained. Usually, ± 1 kHz modulation is used.
Address information on the disc is grouped as ATIP information.
The carrier frequency f_A0Using
Detects ATIP information by frequency-detecting the wobble reproduction signal
And confirm the address recorded in absolute time in the subcode
And a synchronization (sync) pattern included in the ATIP signal.
Establishes data synchronization from. That is, synchronization of the ATIP signal
Data reference clock synchronized with pattern and disk rotation
Get Then, in synchronization with the synchronization pattern, the specified
Overwrite user data to EFM frame
A recording pulse train to be generated is generated and recording is performed. FIG.
(A) has a predetermined value in the CAV mode according to the method (i).
Address, and extract the wobble carrier frequency
4 shows an example of a flow for generating a quasi-data clock. In addition,
In FIG. 7A, the dotted line indicates f_A0And f_d0Signal flow
This does not indicate the work flow. First,
Steps are the same as for a CD that is played back in the normal CAV format.
In step A1, the tracking servo is turned off,
Move to a predetermined radius by coarse movement of the linear motor in step A2
And a track cross signal is sent in step A3.
Step A
4 near the count required to reach the target track
It is determined that the
Apply the servo. Next, in step A6, push-pull
Regenerate wobble signal from signal_A0Is extracted. This and
And, if necessary, determined by equation (3) above;
Wobble transport around the track at a certain radius
Predicted wave number f_R0Tuning with reference to_A0Extract
Put out. f_A0After or simultaneously with the extraction, go to step A7
Demodulates the ATIP information, and extracts the
Reads time information. In step A8, the absolute time
The address where you want to record data while referring to
Go to In step A9, f_A0196 times
The reference clock signal f of the obtained data_d0And ATIP information
Recording while synchronizing the sync pattern included in
A recording pulse train based on the EFM data to be generated is generated.
At step A10, overwriting is performed. As described above, the address information and the synchronization pattern
Although the case where it is recorded as IP information has been described,
Used in minidisc (MD) instead of ATIP information
ADIP (Address In Pregr)
oove) Information ("All about MD", Masayuki Kawamura,
When it is recorded as Dempa Shimbun (1998))
This flow can be used in exactly the same way. In general, 1
Since frequency multiplication of 00 times or more involves an error, the following (ii)
Or the data reference clock using the method (iii)
It is also possible to increase the accuracy of the frequency. [Method of Generating Data Reference Clock]
(Ii)] media at the address where the recording of the medium is to be performed;
Time information mm: ss: ee (mm minutes, ss seconds, ee
From the meaning of the frame)
Find out. The time length of one frame of the ATIP signal is
Normally corresponds to the reciprocal of the frequency 75 Hz, so a 1x speed line
Speed v₀ Then, the spatial length of one frame is v₀ / 7
5, from 00:00:00 to mm: ss: ee frame
The total frame length leading to the₀ / 75) × ｛75 ×
(60 × mm + ss) + ee｝. Here, absolute time
The radius of the interval 00: 00: 0 is R_inTrack track
Switch is TP, R_inWith N as the 0th track
_TThe total length of the groove up to the third track is expressed by the following equation (4).
Is done. [0120] (Equation 2) Also, N_TOf the groove up to the + 1st track
The total extension is represented by the following equation (5). [0122] (Equation 3) The above-described total frame length is equal to the value of equation (4).
N such that it is between the values of equation (5)_TIs the address
Rack position. This is when the pickup moves
Deriving the number of tracks to the target address
This is the same procedure. Such a track from the innermost circumference
Number N_TFrom Equation (4), the radial position R is obtained by the following equation (6).
You. R = R_in+ N_T× TP (6) The predicted frequency f is calculated using equation (3) corresponding to this R._R0Depart
Let it live. One frame of the minimum unit of ATIP address information
Time is 1/75 second, so at least every 1/75 second
And f_R0Is updated. This is a radius position of 22 mm
But it is only about 1/10 lap of the track, so the radial position
The deviation is negligible. Note that the test writing area and the lead-in area
In the recording area inside 00: 00: 00: 00
Also N_TIs a negative number, and R_inReduced from
By doing so, accurate R can be calculated. is there
Or calculated from the address information obtained by equation (6)
Does the radial position R have an error of at most several tracks?
Since it is an accurate value, directly from R, f_d0= F_in+25.9308 (RR_in) / (R_out−
R_inAccording to the equation (7), the linear velocity at the radius
And the reference clock f of the data at the linear velocity_d0(M
Hz) = 1 / T. Where f_in
Is R_inIs the reference clock cycle of the data at
7.2872 MHz. FIG. 7B shows such a reference signal f._R0Using
A method of generating a reference clock synchronized with the rotation is shown. FIG.
In (b), the dotted line is not a work flow but a reference signal, etc.
The flow of is shown. In FIG. 7 (b), steps B1 to B
5 are the same as steps A1 to A5 in FIG.
You. Step B1 that proceeds in parallel with the flow of FIG.
In step 1, first, calculate from the absolute time address of the destination
From the radial position information obtained by
The generated reference clock period f_d0And divide by 1/196
Thus, the reference signal f of the wobble carrier frequency_R0Got
In step B6, f_R0Directly as the carrier frequency
Demodulate and decode the ATIP. After decoding starts,
F with reference to the absolute time information of ATIP_d0Is the source of change
I do. Confirm that the specified address has been reached in step B7.
After approval, f_d0Synchronization with the ATIP synchronization pattern
The reference clock synchronized with the disk rotation is obtained.
Enable recording pulse train generation in step B8
You. Then, the recording pulse train is used to perform step B9.
Perform overwriting. A large amount of recorded information
The address moved significantly with the progress of the barlight
Even f_d0Always uses ATIP address information to
If it were updated dynamically, the radius position would change.
Even within the tolerance of mark length error
A recording of the linear density can be achieved. This tolerance is approximately ± 1
%. [Method of Generating Data Reference Clock]
(Iii)] In addition to the wobble groove, CLV
In mode f_L0= Single round of higher frequency than 22.05 kHz
Add the clock mark of the wave number,
Separate and detect the clock mark while rotating it at a constant
Output frequency and multiply this repetition frequency by a predetermined value.
This is a method for generating a clock. When the reference clock is obtained
After that, the same method as described in the above method (1) is used.
The synchronization pattern and data of the address signal such as the ATIP signal
The reference clock can be synchronized with the disk rotation.
Wear. The clock mark frequency is the frequency of the wobble signal
If the band is intermediate between the band and the data frequency band,
Easy bandwidth from both table and data frequencies
You can sort by filter. That is, preferably 1x speed change
Of the wobble frequency by more than twice
1/22 of the quasi-clock (repetition of 11T mark and space)
(Equivalent to the same spatial frequency). More specifically
Is about 60 to 196 kHz, that is, 22.05 kHz
2 to 8 times the second frequency f_L2Arranged in
A clock mark is provided on the medium. Further, f_L2Is the reference clock frequency of the data
Data is set as an integer fraction of the number 4.3218 MHz.
F to obtain the reference clock of_L2Multiplied by the integer
To obtain the reference clock. Combining the above conditions, f_L2
2 times, 4 times or 7 times of 22.05 KHz
If used, it can be separated from the wobble frequency and data frequency domain.
And a fractional integer of 4.3218 MHz.
Suitable. However, as described above, lines on the same medium
Speed from 4x speed from innermost circumference to outermost circumference of recording area
When changing up to 10 times speed, wobbles, clock
Mark, data frequency band from innermost to outermost
Since it has a distribution of about 2.5 times over the circumference,
Separation becomes slightly complicated. Specifically, at 4 × to 10 × speed,
Is the wobble carrier frequency 88.2 kHz as described above?
And a data component of 11T.
About 786kHz as repetition frequency of peak and space
~ 1.96 MHz. f_L2To f_L0= 22.05
4 times kHz, ie f_L2= 88.2 kHz
In the case of 4 to 10 times CAV mode, the clock mark
Has a repetition frequency of 352.8 kHz to 882 kHz.
Distributed by wave number. Therefore, one band filter is used for all recording areas.
It is difficult to distinguish the frequency of the clock mark with
Create multiple virtual zones for each radius, and for each zone
It is preferable to switch the band of the filter. Also, f_L2
If the wobble frequency is allowed to be a half-integer multiple,
Filtering out the repetition frequency of the clock mark with a filter
Can be. For example, f_L2To f_L0= 22.05 kHz3.
5 times (1/56 of 4.3218 MHz),
Side f_L2= 77.175 kHz, 4 to 10 times speed
Clock mark repetition frequency is 30 in CAV mode
8.7 kHz to 771.75 kHz, 10 kHz
The width of the data is about 786 kHz.
z to 1.96 MHz. As an example of providing a clock mark,
For example, pits or amorphous marks provided between grooves
It is also good, and the groove has a specific large and short spatial wavelength.
Wobble may be given. In the latter case, a normal CD
-RW wobble amplitude (peak-to-peak) is
Wobble for clock mark for about 20 to 50 nm
It is better to make the amplitude of the
No. And this is the normal wobble mountain, valley, or
It is further superimposed on half the position of
Good. The clock mark has a physical length of 3T mark
(About 0.8 μm). Data wrap
This is because it is easy to select a wave number from a wave number using a bandpass filter. What
Note that, as is clear from the above description, the method (iii) is adopted.
In doing so, the medium according to the first gist
When the wobble groove is a medium and converted to 1x speed
The carrier frequency is about 22.05 kHz and the ATIP information
Has a wobble signal frequency-modulated at ± 1 kHz
And 2 to 8 times the repetition frequency of 22.05 kHz
It is preferable that the clock mark is arranged along the groove
New The frequency generated from such a clock mark
f_L2= 77.15 kHz and f in FIG._A0Replace
Eh, f_L256 times the data reference clock frequency f_d0When
If it is considered, use the flowchart of FIG.
can do. [Method of Generating Data Reference Clock]
(Iv)] When the linear velocity is constant, the frequency
A groove having a constant wobble signal is provided,
The wobbles are phase modulated
Address by missing (zero amplitude)
To use a medium with information and synchronization information
It is. That is, in this method, the medium
Using the medium according to the first aspect of the present invention
Is preferred. In this case, since there is no ATIP signal, the existing
Loss of full compatibility with existing CD-RWs
The angular velocity is not affected by the fluctuation of the groove meandering cycle
After detecting the frequency while rotating the disk at a constant,
Accurate reference clock can be obtained by directly multiplying the wobble frequency.
Lock can occur. And this reference clock is
In the same manner as described in method (i), the address
Information and synchronization information, address information synchronization pattern
Can be synchronized with the rotation of the disk and the disk. this
If the wobble frequency is the data reference clock frequency
f_d01/22 to 1/50
And reduce the multiplication error and separate the data from the frequency band.
Is preferred. At the frequency of this wobble,
F of (a)_A0Is replaced by the flow chart of FIG.
Can be used as is. The above is a blank disk in an unrecorded state,
Alternatively, a disc having a recorded portion and an unrecorded portion
Prescribed on the board by wobbling etc.
From the information, the data base is inversely proportional to the radius and synchronized with the rotation.
Generate a quasi-clock and read address information,
A method of generating a write signal synchronized with the address.
It is an example. On the other hand, when the disc is manufactured,
Format the disc when using it for the first time.
Address information is written over the entire disk recording area using an EFM modulation signal.
Information, synchronization information, etc.
No. may be used. The format process is
It is only necessary to record predetermined data uniformly on the entire disk.
It is not always necessary to perform recording in the CAV mode,
What is necessary is just to perform at high speed, such as 8 times speed, in V mode. Or C
Even in AV mode, radial position is synchronized with disk rotation
The reference clock for data that increases in frequency in proportion to
A clock generation circuit is provided separately to operate the data reference clock.
What is necessary is just to record while sweeping. Recorded EFM
The data reference clock can be directly extracted from the modulated signal.
Clock cycle accuracy and synchronization accuracy.
It is suitable. The following are also used in the formatting process
Methods (v) and (vi) can be considered. [Method of Generating Data Reference Clock]
(V)] Absolute time information by sub-code in advance in the medium
Information is recorded as an EFM modulation signal over the entire recording area.
Is the way. The EF when rotating and recording at a constant angular velocity
The M modulation signal is detected, and the reference clock and address of the data are detected.
Get information about This clock is inversely proportional to the radius,
And the synchronization pattern of the subcode. afterwards,
Write synchronized with clock and address signal as above
Generate a signal. In advance, sub-copies the entire recording area.
If absolute time is recorded as an EFM modulated signal by
User data is optional (usually a series of zeros)
Make a record. With this formatted disk,
Is the EFM modulated signal and the subcode information contained therein
Are all the same as CD-ROMs played in CAV mode.
Accessible by the same method. And EFM transformation
Extracting the data reference clock period from the tuning signal
Can be. This method is a so-called multi-session method
The data to be added is relatively long,
The recorded area from the side is continuous and added outside
Suitable for you. [Method of Generating Data Reference Clock]
(Vi)] A CD-ROM standard (so-called
Block structure in the Yellow Book)
This is a method of recording as a number over the entire recording area. Angular velocity
The EFM modulation signal is detected when recording at a constant rotation.
Then, a data reference clock and address information are obtained. This
Clock is inversely proportional to radius, and rotation and subcode
Period pattern. After that, clock as before
And generate a write signal synchronized with the address signal.
You. More specifically, first, the CD-ROM format
98 EFM frame (2,352 bytes)
A block structure with 1 unit as a unit
To record. The block structure is specified in the CD-ROM standard.
Logical data structure. Each block contains user data
Data is synchronized with a logical address called a header
Signal, and this data is also included during formatting.
Record. Data is recorded in units of 98 frames
Is done. First, the data to be recorded is 2,048 bytes
12 bytes each for synchronization information and 4 headers
A byte is appended. Next, the header and data except for the synchronization pattern
Data scrambled, and ECC (data correction code,
Error Correction Code) Data
Is added. To the one added with the previous synchronization information
And interleaving to change the order of the data
After that, it is divided into 98 frames. First in each frame
EFM frame synchronization pattern and subcode added at the beginning
Each frame is added to the middle of the frame and the end of the frame.
ECC data calculated from system data
Be added. The above subcode contains absolute time information etc.
Various information is included, especially the 98th frame
The frame synchronization signal is applied only to the 0th frame and the first frame.
include. Thus, the EFM modulation to be recorded
A signal is created. The UDF (Universal Di)
sk Format) version 1.5 or later
Perform format processing by random packet write method
And when formatting the unrecorded disc
This is also preferable because the above block structure is recorded. What
Note that the random packet write method is based on OSTA (Opti
cal Storage Technology As
association, a trade association in the United States)
Have been. Format processing for packet writing
Is the Orange Book Part 3 of the CD-RW standard
Is also stipulated. [0139] However, packet
(1 packet consists of 16 or 32 blocks)
Some discontinuity of subcode data occurs at the link between
Because it can be generated, from the address information included in the subcode
Is the block recorded in the user data section of each block.
It is preferable to access by referring to the lock address.
In this method, the data to be added is short and has a fixed length.
Overwrite at random positions,
Suitable for the so-called random packet write method
You. According to the above method (v) or (vi), C
Move to a predetermined address in AV mode and carry wobble
Ski that extracts frequency and generates reference data clock
Examples of the system are shown in FIGS. 8 and 9, respectively. First, CAV
Tracking support, just like a normal CD played in the
Turn off the servo motor and move to the specified radius by coarse motion of the linear motor.
While tracking the track cross signal.
The number of moving tracks, and
Apply tracking servo when approaching the und number
You. Here, in step C6 or D6,
Same as CD-ROM playback system in CAV mode
In the same way, the EFM data is reproduced from the recorded RF signal,
A reference data clock is extracted from the EFM data. Sa
Subcode in step C6.
From the frame sync signal of the
Synchronization with the disk rotation is established, and the sub-code is
The address information is obtained from the Q channel. CD-ROM
When using the data block structure, go to step D6.
Using the 12 bytes of synchronization information at the beginning of each block.
And establish synchronization at step D7.
Get address information from the following header. And yes
In the case of a deviation, a predetermined
After determining that the dress has been reached, step C9
In step D9, the data is converted into a recording pulse train,
At 10 or D10, predetermined data is
Overwrite the dress. [Method of Generating Data Reference Clock]
(Vii)] The above-described method basically employs CAV
The rotation itself is said to maintain the rotation accuracy independently
It is a premise. However, the CAV rotation system and reference clock reference
Illumination signal f_R0Form a feedback loop between
And the synchronization of the rotation system and the data reference clock is accurate.
This is preferred. That is, the desired value is determined based on the CAV rotation.
Wobble reproduction signal or clock mark with radius of
Or directly from the subcode of the recorded signal or the reference signal.
Reference signal to generate the reference clock frequency.
The calculated clock frequency at the desired radius.
That is, the reference signal f_R0) So that the CAV rotation is synchronized with P
Because LL (pahse lock loop) control
is there. FIG. 15 shows that a predetermined address (radius) is reached.
Achieves synchronization of rotation and data reference clock,
It is a flowchart which shows the procedure of the system which performs a bar light. Figure
FIG. 16 is a conceptual diagram of such a control system. FIG.
5 and FIG. 16 show the CAV method,
Optical disk recording and reproducing device that achieves equal linear density recording
The operation flow is shown. FIG. 16 is a general view of FIG.
In particular, a focused light beam must be
G) When you move to the recording block of the address in the radial direction
The reference clock of the data that changes in inverse proportion to the radius
T (frequency f_d0Signal generator (VCO)
1) and the reference clock T at a predetermined radius is 1 / N
(N is an integer) obtained by dividing the reference signal f_R0And the ad
Carrier frequency f of groove meandering detected in_A0The phase
By comparing, the reference clock of the data at a given radius
Frequency f _d0And f_A0Is f regardless of the radial position_d0= N
・ F_A0Fine-tune the disk speed to maintain the relationship
The start position of the recording block and the block
Means to achieve synchronization of the data strings to be written to
And are described in detail. FIGS. 15 and 16 show a rewritable computer in particular.
It is assumed that N = 196 for a Pact disk as an example. this
In the method, first, the radial position movement support, address reach judgment
Calculation of the data reference clock
Controlled by CPU1. As the initial state, for example,
The circumference is the reference radius R_inTo the recording track at the reference radius.
Assume that focus and tracking are applied. Book
When using the medium of the present invention, in particular,
The linear velocity around the circumference is about 4 times as fast as the CD linear velocity (4.8 m / s)
So that the reference rotational speed ω₀Is ω₀= 1900 to 220
It is set to be in the range of 0 rpm. Specifically,
Quasi radius R_in= 21mm, 2180rpm, R_in= 2
If it is 4 mm, it is about 1910 rpm. In FIG. 16, dotted lines are based on FIG.
PLL for rotation control surrounded by
  A detailed description of the "locked loop" system
is there. Conversely, in FIG. 16, elements other than the rotation control system are simplified.
ing. For example, the encoders ED1 and ED2 in FIG.
And the laser driver LD1
Is omitted as a part of the recording pulse conversion circuit WP1.
You. In addition, focus servo mechanism FE1, tracking
Servo mechanism TE1 is omitted, access servo system
The control CPU 1 has functions included in a part of the control CPU 1 and
It is regarded. The reference clock generation circuit CK1 shown in FIG.
In step 6, a signal from the control CPU 1 is received, and D / A conversion is performed.
And a voltage control transmitter VCO1. here
And f_d0Is data proportional to the radius based on the address information.
The reference clock frequency of the data, for example, (4) to (7)
The digital output calculated by the control CPU 1 using the equation
The force result is converted by the A / D converter to f_d0Voltage V proportional to_d0Conversion to
After that, the V_d0Generates a frequency proportional to VCO1
Generate it. This part is an example, the address
The reference color of the data proportional to the radius calculated from the information
As long as the clock frequency is generated, other digital synthesis
Can be replaced by the user. As mentioned above, the outermost
If the circumference is 10 times faster than the CD, the innermost circumference is about 4 times faster.
, F_d0Is 17.287MHz to 43.218MHz
Digital synthesizer,
This frequency range can be swept with a resolution of about 0.1 MHz.
Is desirable. A reference clock period proportional to the radius
However, the resolution changes stepwise at this level of resolution.
However, the error of mark length at each radial position is
(Usually about ± 1%). F_d0Is divided by the divider by 1/196, and
Reference value f of carrier frequency of wobble at constant radius_R0When
Used as In FIG. 16, BPF is a wobble.
From the carrier signal f_A0Band fill for extracting
, HPF is a high frequency band for FM demodulation of the wobble signal.
It is a pass filter. In the phase comparator PCO, f
_R0With reference to f_A0And phase comparison. Also, PC
The phase comparison result of O is the voltage V averaged by the LPF._moConversion to
But V _moThe larger the phase difference, the larger the feed
This is a back signal. V_moIs spindle by VCO2
Frequency f for frequency control of motor M1_PMIs converted to
The combination of PCO, LPF and VCO2 is a normal PLL
This is a general configuration used for control. This PLL control
Gives f_A0Is f_R0Synchronous with the phase at PCO
The rotation speed of the disk is adjusted so that the difference becomes zero. According to the flow shown in FIG.
In G1, an address move command and a desired move destination address (ta
Target address) DA1 through the external interface
First, it is input to the control CPU 1. Add in step G2
The tracking servo is turned off for the less movement.
At the same time, in the parallel step Ga1, the CPU 1
From AD1 (here we take ATIP as an example)
Formula of ATIP address radius and track number to be set
It is calculated by (4) to (6). Also, according to equation (7),
The reference clock at the radius of the target address
Frequency f_DAAnd the frequency is generated by VCO1
You. Also this f_DAIs divided by 1/196 and the target
Carrier frequency f of wobble at address_RAGenerate
You. f_DAAnd f_RAIs referred to as the predicted frequency. More generally, the optical disk D1
Reference radius R at the beginning or end of the recording area_refIn
The reference clock of the data_ref(Frequency f_ref),
Let ΔR be the radial width from the innermost circumference to the outermost circumference of the recording area,
Calculated from predetermined ATIP address where data should be recorded
Radius R and the reference clock T at the address
(Frequency f_d0) Is f_d0= F_ref+ (R-R_ref) / Δ
F so as to maintain the relationship of R (100)_d0To
Calculate according to radius. In addition, (R-
R_ref), Calculate the number of tracks to cross, etc.
A radius movement signal is output to the motor M1. At step G3, a command from CPU 1 is issued.
Pickup PU1 driven by the linear motor LM1
Moves in the radial direction and counts tracks in step G4
By the coarse movement mechanism toward the predetermined target address
Moving. Immediately before the target address in step G5
Confirmed that it was close enough by the track count
Then, apply a brake to the coarse adjustment mechanism and go to step G6.
And the track near (usually immediately before) the target address
Turn on the tracking servo at
Laser at playback level while maintaining King Servo
The light beam is scanned along the guide groove. In this state, the wobble carrier frequency f_A0To
Extract. Pickup PU1 is at target address
Because it is close, f calculated from the target address
_RAAnd the extracted f_A0Is PLL locked by phase comparison
Range. Therefore, in step G7, f_A0And f
_RAAre compared, and f_A0Is f_R0Spindle to synchronize with
Apply feedback to the motor M1 to synchronize with the CAV rotation.
Let Next, in step G7, the predicted wobble
Carrier frequency f_RABy the CA of the spindle motor M1
After locking V rotation, do not maintain tracking servo.
Meanwhile, the light beam is scanned along the track. Steps
G8 push-pull pickup PU1
And reproduces the wobble carrier frequency by BPF.
Number f_A0And the ATIP decoder WDA1
To start decoding ATIP information. To step G9
It is updated every moment that is played in real time
In parallel step Ga2 based on address information
f_d0Is calculated and updated from time to time.
Constant reference clock frequency f_d0To occur. Also at the same time
The f_d0Is the latest f obtained by dividing by 1/196_R0See
In light of f_R0And f_A0Is performed in the PCO,
f_R0And f_A0CAV rotation control of the disk so that
The control is performed on the spindle motor M1. Step
G8, G9 and Ga2 are f_d0PLL signal with
Constitute a feedback loop, and the spindle motor M1
Is maintained at a substantial CAV rotation. In steps G8 to G10, the fees
Scans the recording / reproducing light beam under the action of
ATIP address and f that change_d0CAV times depending on
Approach the target address while fine-tuning the number of turns.
Reached the target address in step G10
Is determined in step G11, the recording pulse
A row is generated. Binarization under command of control CPU1
The data is encoded into an EFM modulated signal and
Generated f_d0In synchronization with the recording method of the present invention.
The recording pulse is corrected and α as shown in FIG.₁T, β₁T, ...
.., α_mT, β_mA recording pulse train gate T is generated.
And a recording pulse generation circuit WP1 based on the gate signal.
The laser diode drive of the pickup PU1
A kinetic current is generated. Pick up in step G11
The recording power Pw, the bias power Pb,
Erase power Pe irradiates track at target address
Is overwritten with predetermined EFM modulation data.
You. Here, when the recording pulse train is generated in step G11,
Is f_d0At the same time, the synchronization signal in the ATIP information is referenced.
This achieves position synchronization with the ATIP frame. Further, the input data is converted to a CD format.
Recording pulse train generation circuit for further encoded data
A recording pulse train is generated in WP1. In FIG.
Correct the recording pulse train according to the linear velocity corresponding to the dress
We also consider doing. The above procedure is based on commercially available CD-
R / RW drive, wobble frequency and reference clock frequency
Compare the wave numbers to achieve CLV rotation synchronization and perform recording.
It is seemingly similar in flow to the control system. CLV times
In reverse synchronization, the reference clock frequency is independent of the radial position.
Constant f_d0Are used as reference signals. This f_d0See
As a signal, f_R0And rather forcibly turn the motor
Synchronize rotation by changing the rotation drastically. At this time,
If the amount of direction movement is large, the rotation speed
Without rough adjustment to the rotational speed determined by calculation from the diameter, f
_A0And f_R0Difference is too large for PLL controlled capture lens
I will be out of Ji. On the other hand, the apparatus shown in FIG.
M1 is the initial CA before the start of the radial movement.
V rotation speed, large f due to radial movement_R0Passing
And f _A0Change in proportion to the radius even if
Therefore, do not deviate from the capture range of the PLL.
No. In other words, the target address is
If you can get close enough to the truck,
Radius while reading address with ATIP decoding as it is
PLL control of CAV rotation while fine-tuning the position
You. In other words, when the address reaches a predetermined address,
Strictly speaking, the CAV rotation speed is
F that changes in real time depending on the dress_d0Based on
Thus, it is finely adjusted by the PLL control. In Figure 16
The portion enclosed by a dotted line constitutes a PLL control circuit.
You. Here, f_d0AT which is the minimum unit of updating
For each IP frame (1/75 second unit at 1x CD speed)
f_R0= (1/196) f_d0Synchronize with disk rotation
Because the lock is performed by PLL control, the CAV rotation control method
The expression is, in other words, the virtual zone for each ATIP frame.
Also function as a ZCLV provided with. However, each zo
ATIP frame, which is the length of the
Because it can be considered as CAV rotation because it is less than
is there. Such a CAV rotation control is performed by a spindle motor.
Rather than mechanically controlling CAV rotation of M1 independently,
More precisely, the reference clock of the data at each radius
And the rotation of the disk can be synchronized.
The advantage is that the fluctuation of the mark length can be extremely small.
I do. Although omitted in FIG. 16, the pickup
The CAV rotation at the time of motion is a spindle motor just in case.
Use the speed sensor (usually a Hall sensor, etc.)
) And monitor with a rough accuracy of about ± 1 to 10%.
It is more preferable to use the rolling maintenance control mechanism in parallel.
From zero revolutions to the capture range of the PLL
Until the start of rotation, rather direct control of the rotation speed
Is necessary, and after reaching the specified number of revolutions,
The generated reference clock signal f_d0PLL control referring to
Need to move to. Also, by any chance, CAV
The capture range of the PLL must be kept even if the rotation deviates greatly
It is also effective to prevent it. Furthermore, the principle
In the PLL, the innermost track is 4x speed recording, and it is slightly
Can't distinguish double frequency like 8x speed recording
So, what should be suddenly synchronized at 4x speed, synchronized at 8x speed
Spindle to prevent runaway
Relatively rough rotation by directly monitoring the rotation speed of the motor M1
It is effective to use the turn control together. This CAV system is therefore compatible with the ATIP address.
Reference frequency f calculated from the_d0And f_R0Fine-tuned with
The conventional CLV mode PLL rotation control
It is different from the lord. This fine adjustment width maintains the PLL control
To maintain a substantially constant linear density record
In order to enable reproduction in the mode, usually, the reference rotational speed ω ₀
Is preferably within ± 1%. In other words, radial coarse
The target mechanism is sufficient to maintain this relationship.
It is desirable to be able to approach the vicinity of the restaurant. In the apparatus shown in FIG.
Is about 2.5 times the band from the innermost circumference to the outermost circumference.
Pay attention to the setting bandwidth of PF, HPF and LPF
You. Especially for the LPF in the PLL control system,
You need to split the radius into several zones
There is. In the present invention, by the above method,
Generates a reference data clock that varies inversely with radius.
Can be made. However, the reference data clock of the present invention
The method of generating cracks is not limited to these. Above
CD-compatible isolinear density recording as described in CAV mode
Access method to realize the data reference clock
The generation and rotation synchronization method is
Although widely applicable to CD-R / RW media, the present invention
When used for media and recording methods, access
This is preferable because the performance is improved. The CD has a diameter of 8c.
CAV method in the case of small diameter size
The difference in linear velocity between the innermost circumference and the outermost circumference is at most twice, so
Media, recording method and recording / reproducing device
Wear. In this case, in order to increase the transfer rate,
Preferably, the linear velocity is 10 times or more. [0161]7. Application example using CAV recording
about Now, in the following, the present invention capable of recording by the CAV method is described.
Rewrite with rewritable compact disc and CAV method
The recording method of the present invention for recording on a compact disk
Access time to addresses at different radii
Applications that take advantage of such advantages, although reduced in width
An example will be described. More specifically, for repetitive practice of language and music
Of the textbooks on CD. Such as
In the application, first, a demonstration (demonstration
A foreign language sentence or music bar
Is played back as the data of the
Promptly, and record the content that the user repeats immediately
As new input information and record it in the user data area.
You. Therefore, one CD-RW disc is
Application program, play the program, and
Play demonstration data to demonstrate
After performing the action, the user data repeated
The same recording / reproducing device if it can record on the same CD-RW disc
It is very convenient for recording and playback. Usually, the demonstration is repeated repetition.
Is divided into units of seconds to tens of seconds to facilitate
The demonstration and the recording of user data
It needs to be repeated within this time range,
Between the application program area and the user data area
The access time of the optical pickup between can be shortened as much as possible,
Recording medium and recording method capable of recording by CAV rotation method
Is particularly effective. Recently, we have been playing back CDs with CAV
In most cases, CAV is used for both recording and playback.
If it is done as it is, switching from recording to playback and from playback to recording
The replacement process is easier and faster
Preferred properties are obtained. The CD-RW medium suitable for this application is a program
Predetermined application in a specific area continuous in the RAM area
An application program that stores program data
Gram area and at least the application
User data related to the application program can be recorded
User data recording area is set,
Playing the application and related to the application
Recording of user data is performed at the same rotation speed. The application program area is
The manufacturer records some of the unrecorded rewritable CD-RWs.
May be created by recording
RO formed on the substrate by a pit (phase difference pit)
It may be recorded as M data. In any case
However, the application program itself is actually
For this CD-RW
The disc is interpreted as having a partial ROM area,
Is a partial ROM (Partial-ROM, P
-ROM). Such a P-ROM type CD-RW disc
In, usually, data along ATIP address
Store application programs as shown in the layout
Area (application program area) and user
When the data recording area occupies consecutive addresses,
It is generally reserved as a lump area.
You. FIG. 25 shows a data arrangement along the ATIP address.
It is a schematic diagram. FIG. 25 is a perspective view of a CD-RW disc.
00 and a cross-sectional view 101 are shown. CD-RW disc
PCA (Power Cali) in order from the innermost circumference of 100
brace Area), PMA (Program
  Memory Area), Lead-in area, Program
Has a data structure consisting of a RAM area and a lead-out area
You. Of these, PCA is a trial writing area for determining power.
Area, PMA is a temporary, unique to CD-R and CD-RW.
The file management information recording area and lead-in area are originally CD
-TOC (Tabel used in ROM format)
  file management information called “of contents”
Information and disc management information, lead-out area
The area is an area for indicating the end of the EFM data,
The program area is the area where user data is to be recorded.
In the present invention, the application area is stored in this program area.
Application program area and rewritable user data
Data area. Playback with conventional CD-ROM
To maintain compatibility, make sure to
It is necessary to record predetermined information in the window area. In the present invention, at least the PCA region
From the beginning B of the lead to the end D of the lead-out area
The formation area (the shaded area at 100 in FIG. 25)
It is composed of one phase change medium. In the program area
To store application programs
There are two types of areas to realize a typical ROM function.
Is a pre-pit array of recesses formed on the substrate surface in advance.
(Rows of pits previously formed on the substrate by injection molding, etc.)
Area where data is recorded using a recording layer on the substrate
(Master ROM area). The other is CD-RW
The recording layer is used as a rewritable area on the entire surface of the disk 100.
After forming and recording data in some area in it,
The recording drive rewrites part of the area
This is an area (post-ROM area) in which this is prohibited. At least the post ROM area and the RAM
In the region, the laser light is guided as shown in FIG.
In order to achieve this, a spiral guide groove 105 is provided.
I have. The guide groove 105 is formed by groove walls 105a and 105b.
The cross section is usually depth for CD-RW
Trapezoid of 0.03-0.05μm, width about 0.5μm
It has become. Laser light is applied along the groove to a disc.
It is scanned in the circumferential direction by the rotation of the clock. The guide groove 105 is
Addition of ATIP information, synchronization signal, etc. by meandering in the radial direction
Wobble for data addition is formed. FIG.
In the figure, the amplitude of the groove meandering is exaggerated.
For 0.5 μm, the meandering amplitude is about 0.03 microns
It is about. On the other hand, the master ROM data
-If there is a ROM area, as shown in FIG.
A center line 107 connecting a plurality of pit rows 106
Have the same meandering amplitude as the guide groove 105.
It is desirable that this be done. In any case, from the beginning B of the PCA area,
Along the guide groove in a broad sense
To add address information by wobble
Time-based address information and synchronization signals are given
It is desirable. Absolute time address is 1/75 second
In small units (frames), expressed in minutes, seconds, and frames
Is done. In FIG. 25, at the start point A of the program area
ATIP is 0 minutes 0 seconds 0 frames (hereinafter 00: 00: 0)
0, etc.) up to 79:59:74
Continue until the frame. Program area according to data capacity
The maximum ATIP address of the lead-out area
The start time (point (c) in FIG. 25) can vary. Well, professional
The gram area is the lead-out area at point C in FIG.
Move to The ATIP address of the lead-out area is
Take over the last ATIP address in the program area
It continues to increase. Usually, the length of the lead-out area is 1-
It takes about 2 minutes. Meanwhile, PCA, PMA, lead-in territory
The area is arranged from point B to point A in FIG. That
ATIP address is reset at point A as 00:00:00
After being set, points A to B (the first address of PCA)
Toward 99), gradually decreasing from 99:59:74.
Good. ATIP ad for PCA, PMA, Lead-in
Less can only be used in the 80 or 90 minute range
ing. FIG. 27 is an example showing the arrangement of data.
In FIG. 27, points A, B, C, and D correspond to points A, B in FIG.
It is on the same ATIP address as B, C and D. And
BA is PCA / PMA area 110 and lead-in area 11
1, AC is a program area 112, and CD
Is the lead-out area 113. In FIG.
The application program area 120 is located at an inner peripheral portion.
The service is provided at the beginning of the ATIP time.
The data area 121 is located at the time of the ATIP relative to the outer peripheral portion.
It is located near the back. In FIG. 27, the application program
The RAM area 120 and the user data area 121 are simply
It is arranged separately on the inner and outer circumferences, but which is the inner
It doesn't matter. Also, for example, if the program area is
According to the rules of the multi-session format, two
Sessions, one of which is the application
Session that contains the
It is like a session where you can write user data freely
It may have a data structure. In the application program area 120
Is an executable program that interacts with the user
Main menu program that controls input and output that allows
Subroutine work based on rum or main menu
Through basic routine programs and menus
Tasks and demos that work according to the user's choice
Subroutine program that runs the installation
An executable program that stores executable programs such as programs
Area 123 and referenced by the application program
Demo Day to store a collection of demonstration data
Data region 124. In the following, both are collectively called apps
This is called an application program area. Demonstration
The data collection includes, for example, multiple sub demonstrations.
Demo 1, Demo 2, ..., Demo n
The user can select one or multiple
It can be reproduced. For example, in the user data area,
For example, for demo 1, demo 2,...
-The repetition contents are the repetition data 1 and the repetition data respectively
2,..., And repetition data n are stored. The application program area 120 and
To perform frequent access between user data areas 121
When the logical data structure of both areas is the same,
The same management method is essential when reproducing data.
This is preferable because there is no need to switch the decoding method. Special
In the case where audio data is handled as described later,
Data playback / transfer route on disk and sound in real time
To close the gap with the voice playback rate,
Of application data and user data
To switch between recording and
Data has a fixed-length packet structure.
Good. Here, the fixed length packet in CD-RW is
The recording will be described. CD-ROM format
In this case, as shown in FIG.
The unit of 2352 bytes including additional data in 8k bytes
Data processing is performed collectively as block 130.
U. One block 130 has an ECC code for error correction.
No. (131) etc. corresponding to ATIP called header
4-byte data (132) including address information
Synchronous signal required for code with data including ECC and ECC
No. 8 bytes (133). The 2352 bytes are divided into 24 bytes × 98
When divided into trixes, a data unit of 24 bytes per line
The position (135) is called a frame, which is an EFM conversion.
Basically when converting to key data, it is a user
It cannot be operated from the side. 24 belonging to the frame 135
Parity for error correction is added to byte data,
By adding address information called a subcode, EF
After the M modulation, it is recorded on the disk. The fixed-length packet record of the CD-RW is
Assuming the use of the D-ROM format, US O
STA (Optical Storage Techn)
union in the Association
-Sales disk format (Universal
  Disk Format (UDF) version 1.
5 and Multiread format
Was enacted. 32 blocks per block
User data is grouped into one unit and shown in FIG.
Run-in block 141, run-out block
Unit to which block 142 and link block 143 are added
Is referred to as a packet. That is, 64k for one packet
User data block consisting of bytes of user data
A group of blocks 140 is included. [0177] Such a flowchart is described in, for example, FIG.
As shown in FIG.
CD-R having program area and user data area
W disk 153 and rotate the disk in CAV mode
CD-RW drive for recording and playback
Live 150 and a host connected to the recording / reproducing device.
Depending on the system including at least the
Is realized. CD-RW drive 150 and host computer
The computer 151 can transfer data to each other.
They are connected by a data transfer path 200. Data transfer method
ATAPI or SCSI system is used
You. The data on the CD-RW drive 150 during data transfer
Data processing speed and data on the host computer 151 side
In order to eliminate the difference in processing speed,
Each has a buffer for data transfer
There are memories 206 and 207. With buffer memory 206
In 207, for example, data is
It is processed. In the drive 150, the EFM modulation signal
Signal amplification, band filter extraction, encoding, deco
Encoding, decoding and recording
The pulse generation and the like are performed by the data processing system 204. De
The rotation control of the disk is processed by the rotation control system 203 and the optical pickup is controlled.
Of the backup 201, tracking servo,
The cas servo is processed by the pickup servo system 202.
You. Interaction between these mechanical controls and data processing
Are controlled by the system control CPU 205. CP
U205 records these machine controls, data processing, and electrical signals.
Generic term for higher-level systems that control recording and playback, etc.
It is not always realized by one IC. The CPU 210 of the host computer
Thus, the application program is decrypted and executed. De
Data via the data transfer path 200 and the buffer memory 207.
The received data is transferred to the CP via the cache memory 209.
Processed in U210, also via cache memory
It is stored in the working memory 211. Also working memory
211 is a RAM memory 212 or a hard disk 2
12 as a workspace during program execution
Used. The minimum data processed by the CPU is cached.
Cache memory 209. Bus controller
Laura assists the CPU 210 in the host computer
Control the flow of data. The system of the host computer 151 is as follows.
As a user interface, microphone, camera, etc.
An AV (audio-visual) input device group 217;
AV output devices such as speakers and displays 219
And a device group 220 such as a keyboard and a mouse. A
D (analog-digital) conversion circuit 216 or DA
(Digital analog) conversion circuit 218
-Input and output processing can be processed as digital data
Swell. Normally, only CPU 210 performs audio and image processing
Processing by the dedicated processing circuit 215.
Is common. Audio / image processing circuit 215 and its higher order
The sound / video controller 214 of the
Sampling, interpolation, compression / decompression, etc. are performed. Also,
If both audio and video data are included, audio and video data
Data processing for establishing data synchronization is also performed. this
In these processes, audio / video can be processed by separate ICs.
There is, but it is described collectively here. Keybo as well
The data from the card and mouse is also input to the IO control circuit 221.
Processed by a representative system. When reproducing application data
Means that in the drive device 150, the disk 153 is C
It is AV rotating and emitted from the optical pickup 201
Scanning of fixed-length packets
The data on the disk is read. The data in the packet unit
Is subjected to EFM demodulation in the data processing system 204,
D-ROM format block unit data (2K
(Byte unit), the buffer memory 20
6 and the transfer path 200 of the interface
Is transferred to the host computer 151 via the. De
The data transfer is performed by the CPU 210 of the host computer and the data.
Control by live system control CPU 205
Have been. Buffer memories 206 and 207 typically contain D
A solid-state memory device such as RAM is used, and a drive device
Body 150 and host computer system for data processing
151, and is provided for synchronization of data transfer.
It is necessary to achieve the achievement. But drive
Main body and host computer system, especially CPU 210
In a system in which the functions of
Buffer memories 206 and 207 need to be provided separately.
No need. Data playback on the actual disk is double speed
Because it is playback, it is re-
The production is completed and the transfer between buffer memories 206 and 207 is completed.
Transmission time is also used as an interface for normal SCSI or AT
With the API method, it is extremely short so as not to cause a problem.
End in time. Here, the rewritable compact disc 1
In 53, the speed at the time of recording and reproduction is, for example,
Range from 4x speed at the innermost circumference to 10x speed at the outermost circumference
Over. On the other hand, audio data is normally played back at 1x speed.
You need to be careful. The gap of such playback speed
In order to solve the problem, it is necessary to convert the reproduction speed. And
However, the data read through the above data reading process
All of the data of model 1 is temporarily stored in the working memory 211.
After being controlled, the rotation speed of the CD-RW and the data transfer path
Sound (/ video) independent of the 200 data rate
E) is transferred to the controller 214 and the working memory 2
11 data to the normal audio sampling rate.
Digital-to-analog conversion in the DA converter 218
After the conversion, the sound is reproduced on the speaker 219. here,
Digital audio data in CD format and CD-
Logical structure of digital data in ROM format
However, after digitizing the audio data, the CD-R
It is desirable to record in OM format. so
Then, both demo data and user's repetition data,
Fixed-length packets based on the same CD-ROM format
Records can be applied. Regarding data processing such as voice
Is a device built into a normal personal computer.
Function is sufficient, and a detailed description is omitted. CA using CAV-recordable CD-RW
Float showing generalized recording / reproducing procedure in V system
FIG. 31 shows the chart. Steps S1 to S3 are CDs
-CD-RW drive when RW153 is inserted into the drive
Of the control of the system control CPU 205 in the
It is executed based on. First, in step S1, the CD-
The RW disk 153 is mounted on the drive 150. This
Here, usually, under the control of the system control CPU 205,
Start of disk rotation, focus and tracking
Bo is established. The disc is set to the specified CAV rotation speed.
Will be kept. The pickup 201 starts with step S
2, the lead-in area 111, the PMA / PCA area
Access area 110 and read disk management information etc.
I will. Disc management information is used to determine the optimal recording power for recording.
The disc type, along with information about
CD-RW, and CAV recordable C
It is determined that the disc is a D-RW disc. Also, PC
Perform test writing in area A to determine the optimum recording power.
Set. Subsequently, in step S3, the lead-in area
111 and the address at the beginning of the program 112 area
File management information is obtained from a specific address,
The file information of the program area 112 is obtained. An application that can be automatically executed is an application
Immediately in the application program area 120,
In step S4, the application of the disk 153 is
The data 125 of the main routine of the
Is read by the strike computer 151 and the subsequent steps
By the CPU 210 of the host computer 151.
Data transmission via the live 150 and the data transfer path 200
It is executed while collecting. Automatically executable programs
If it is not, the user
Select the executable file of the CD-RW in the program area 120
Then, step 4 is started. Normally, as in step S5,
Menu screen, which is the user interface,
And displayed on the display etc. in the AV equipment group 219
Is done. Using the keyboard 220 etc. for the user,
Select the operation of the subsequent execution program. Here,
In step S6, execution of the demonstration and actual
The content of the demonstration to be performed is selected and the demo
The user is instructed to start the installation
You. The first demonstration selected was Demo 1
I will call it. In step S7, the demonstration
Of the disk 153 on which the specific contents 126 of the
A predetermined address in the demo data area 124 is accessed,
Acquire the data of model 1. Normally, this data is
RAM memory 212 or hard
Temporary storage in the working memory 211 such as the disk 213.
Read from the working memory 211 and
In S8, the sound / video controller 214,
Through the audio / video processing circuit 215 and the DA conversion circuit 218
In one of the AV device groups 219,
Converted and run as a demonstration. Here, the above application program
The process of performing
Assuming that a given sentence is
Play back the demonstration,
Prompts the user to enter information according to
You. In step S9, via keyboard 220 etc.
Data from user by interrupt 1 from user
If the mode is not shifted to the input mode, it is repeated by the route R1.
A demonstration will be held back. A transition to data input from the user
If interrupt 1 has been executed, the process proceeds to step S10.
Pickup 201 is the user of disk 153
Access the data area 121 and wait. At this time CD
-RW disk 153 has a constant CAV rotation speed during playback
The pickup 201
The process can be completed in a very short time. At step S11, data from the user is received.
Data input, which takes language learning as an example.
Is equivalent to the user repeating the contents of Demo 1.
You. The audio data (repeat data 1) is stored in the host computer.
Microphone 151 in the AV equipment group 217 in the data 151
D converter 216, audio processing circuit 215, sound controller
Via the roller 214, the host computer 151
It is temporarily stored in the work memory 211. User data
And Demo 1 data are assigned to the left and right channels, respectively.
And combine them into a stereo recording. Demo 1 Contents
And the content of the user's repetition becomes easier. At step S12, the CD-RW drive
The data is transferred from the working memory 211 to the
In the user data area 121 of the disk 153, the user
-Data is recorded. Step S13 if necessary
In this case, the input data of the user is immediately reproduced. Stay
In user interrupt 2 of step S14,
Data re-entry route R2 or demonstration 1
Route R3 to return to the line can be selected, but it is not necessary
Then, the next demonstration in step 15
Move to (Demo 2) or end the demonstration
The choice is made. Move to next demonstration
If yes, return to step S6 via route R4.
And a demo selection operation is performed. When ending, the process proceeds to step S16.
User newly recorded in the user data area 121.
File management information is updated based on the
Demonstration ended at step S17
Then, the screen returns to the menu screen through the route R5. This
Then, the application professional of the pickup 201
Between the program area 120 and the user data area 121.
Access is maintained at a constant CAV rotation speed
So, the demonstration data playback and its user
Recording of repetition data by
Hyaline without waiting for the user
Language learning by voice and utterance repetition becomes possible. The demo
The installation is not only for audio, but also for each bar of music.
Playback and user repeat, or demo video playback,
Such as video recording with a camera that follows the user
Needless to say, it does not matter. [0192] [Example] [Basic example] One time at a track pitch of 1.6 μm
Reference frequency 22.05 kHz in terms of speed (1.2 m / s)
1.2mm thick polycarbonate with spiral grooves meandering
A carbonate resin substrate was formed by injection molding. Groove width
Was 0.52 μm and the depth was 37 nm. I don't need these
U using a 633 nm wavelength He-Ne laser beam.
It was determined by an optical diffraction method approximating a groove. In the groove meander (wobble)
Further, the address information based on ATIP has a frequency of ± 1 kHz.
It was given by wave number modulation. Subsequently, a lower protective layer and a recording layer were formed on the substrate.
Layer, upper protective layer, reflective layer, UV curable resin layer in this order
Formed. For the deposition of each layer, release the vacuum on the substrate
Without stacking, they were sequentially stacked by a sputtering method. Was
However, the UV curable resin layer (about 4 μm thick)
It was applied by the method. The recording layer immediately after film formation is amorphous
Focuses on the long axis of about 70-90 μm and the short axis of about 1.3 μm
2. Linear velocity by laser light having a wavelength of 810 to 830 nm.
Choose an appropriate linear velocity within the range of 0 to 6.0 m / s,
Irradiation with initializing power 500-700mW to crystallize the whole surface
It was made an initial (unrecorded) state. For the thickness of each layer, the film formation rate was accurately measured.
Thereafter, control was performed by the sputter deposition time. Recording layer composition
Indicates the fluorescence intensity of each element by X-ray fluorescence
By the absolute composition determined by analysis (atomic absorption spectrometry)
Corrected values were used. Density of recording layer and protective layer
Calculated from the weight change when forming a film as thick as several hundred nm
Was. The film thickness is calibrated with the film thickness measured by the probe X-ray intensity
It was used. The area resistivity of the reflective layer was measured by a four-probe resistance meter ΔL.
oresta MP, (trade name) Mitsubishi Yuka (currently Daiai)
Instrument). Resistance measurement is insulated
Glass or polycarbonate resin substrate
Either measure with the formed reflective layer or use the above four layers (lower
Protective layer / recording layer / upper protective layer / reflective layer)
It measured on the reflective layer which becomes. The upper protective layer is insulated with a dielectric thin film.
Since it is an edge, it does not affect the sheet resistivity measurement. Also,
A 120 mm diameter data that can be regarded as a virtually infinite area
While keeping the disk substrate shape, push it to a position with a radius of 30 to 40 mm.
The measurement is made with the lobes in contact. Based on the obtained resistance value R, the area
Resistivity ρ_SAnd volume resistivity ρ_VWas calculated. ρ_S= FR (8) ρ_V= Ρ_S・ T (9) Here, t is a film thickness. F is the shape of the thin film area to be measured
And usually takes a value of 4.3 to 4.5. This
Here, it is set to 4.4. Recording / playback evaluation made by Pulstec
A DDU1000 tester (wavelength: about 780 nm) was used.
Tester 1 with DDU1000 tester with NA = 0.55
(Spot shape is 1 / e^TwoA circle of about 1.25μm in strength
Shape), DDU1000 tester with NA = 0.5
-2 (spot shape is 1 / e^TwoA circle of about 1.3μm in strength
As the shape), any tester was used. The standard linear velocity of CD of 1.2 m / s is increased to 1 × speed.
And overwrite characteristics from 1x to 12x speed
Valued. Reference clock period of data at each linear velocity
Is the data reference clock period 231n at 1 × speed
sec was inversely proportional to each linear velocity. Again
Unless otherwise stated, students performed at double speed. DDU100
Output signal from 0 has cut-off at 5-20kHz
After passing through the high-pass filter,
Jitter was measured with a narizer (manufactured by Yokogawa Electric Corporation). modulation
Degree m₁₁(= I₁₁/ I_top) Is an eye on the oscilloscope
Read by turn observation. Also, R_topSeparately, C
D standard disc CD5B (sold by Philips)
Calibrated with After recording the EFM random data,
3T mark jitter and 3T space jitter of recorded data
Measure and use the higher jitter as 3T jitter
Adopted. Unless otherwise specified, erase power Pe and recording
The ratio Pe / Pw of the power Pw is constant at 0.5, and Pw is
From 9mW to 20mW or 25mW in 1mW increments
Changed. Unless otherwise specified, the bias power P
b is the same as the reproducing light power Pr, and is constant at 0.8 mW.
Was. In the measurement of the 3T / 11T overwrite erase ratio, 3
Repetition consisting of T mark and 3T space (between marks)
After recording the return pattern (3T pattern) once,
Repeat consisting of a mark and an 11T space (between marks)
And overwrite the pattern (11T pattern)
Measures the decrease (in dB) of the carrier level of the T mark
Then, an erasing ratio (erasability) was obtained. Carry
The level measurement was performed by Advantest's Spectra
Analyzer (TR4171) or HP 85
Using 67A, the reproduction signal of tester 1 or tester 2
The signal output was used as input. Overwrite at each linear speed
We performed, but all playbacks were performed at CD linear speed (1.2 m / s).
Was. Spectrum Analyzer Resolution
n band width is 30kHz, Video
The band width is set to 100 Hz, and the input impedance is set to 100 Hz.
The dance was 50Ω. In addition, overwrite characteristics
Evaluation was overwritten 10 times (unless otherwise specified).
After the first recording in the recording state, over 9 times on the same track
(Light). Note that after the accelerated test
The evaluation of the recording signal was overwritten 10 times before the acceleration test.
The recorded signal was evaluated by performing only reproduction after the acceleration test. (Example 1) In the above basic example, the following
Thus, a disk was manufactured and recorded. On board
And (ZnS)₈₀(SiO_Two )₂₀The lower protective layer consisting of
97 nm, In ₈ Ge_Five Sb₆₆Te_{twenty one}Recording layer consisting of
19 nm, (ZnS)₈₀(SiO_Two )₂₀Upper part consisting of
Protective layer 40 nm, Al_99.5Ta_0.5 Reflective layer consisting of 2
50nm, UV curable resin layer about 4μm formed in this order
Then, a rewritable compact disc was manufactured. This Al
_99.5Ta_0.5 Volume resistivity ρ of reflective layer_vIs 100nΩ
m, sheet resistivity ρ_sWas 0.4Ω / □. Initialize
Is an elliptical spot with a major axis of about 70 μm and a minor axis of about 1.3 μm.
Laser diode with wavelength of about 810nm
The scanning was performed with light at a linear velocity of about 3 to 4 m / s. Irradiation power
Is 600 to 700 mW. This disk has NA
1, 2, 4, 6, 8 using a tester 1 of 0.55
And overwrites the EFM modulation signal at 10x speed.
And its properties were evaluated. Erasing power Pe and recording power
Pw ratio Pe / Pw is constant at 0.5 and Pw is 9 mW.
From 1 to 20 mW in 1 mW increments
The overwrite characteristics were evaluated by power. All 10
The value after overwriting was evaluated once. Recording pulse division method
The law is as follows. Let the time length of one recording mark be nT
(T is the reference clock cycle. N is an integer from 3 to 11)
Number), between the recording marks, there is an erase pattern that can crystallize the amorphous.
Irradiates the recording light of the word Pe to the mark of the time length nT.
Is the time length (n-j) T, α₁ T, β₁ T, α_Two T, β_Two T, ..., α_mT,
β_mT, Here, in the order of m = n-1, Σ_i(Α_i+ Β_i) = N-
j (j is a real number satisfying 0.0 ≦ j ≦ 2.0)
And Α_iRecording within the time T (1 ≦ i ≦ m)
Of the recording power Pw of Pw> Pe to melt the layer
Irradiate recording light, β_iWithin the time T (1 ≦ i ≦ m)
Recording light with bias power Pb satisfying 0 <Pb ≦ 0.5 Pe
To perform overwriting by applying a linear velocity of 1.2
When m / s is the reference speed (1x speed), (1) 4x speed
At₁ = 0.75-1.25, α_i= 0.2
5 to 0.75 (2 ≦ i ≦ m), α_i+ Β_i-1 = 1 (2 ≦
i ≦ m). (2) At linear speeds lower than 4 × speed, α
₁ = 0.05-1.0, α_i= 0.05-0.5 (2 ≦
i ≦ m), α_i+ Β_i-1 = 1 (2 ≦ i ≦ m),
(3) For linear speeds higher than 4 × speed, α₁ = 0.5-
2, α_i= 0.5-1 (2 ≦ i ≦ m), α_i+ Β_i-1 =
1 (2 ≦ i ≦ m). Specific α at each speed₁ , Α_i, Β_mThe table
-1. In particular, at 4 to 10 times speed, the current RW standard
(Orange Book Part 3 Version 2.0) Ruth
The division method was strictly followed. Evaluation results of overwrite characteristics
The results are shown in FIG. (A) 3T mark jitter,
(B) 3T space jitter, (c) modulation degree m₁₁, (D)
R_top, (E) 3T mark length, (f) 3T space length,
Represents the Pw dependency. As shown in Table 1, the optimum recording power
Is around 15-16mW, and the overwrite characteristics
It is evaluated by the value at this power. FIG. 10 (c),
From (d), the modulation m₁₁Is 6
0% to 80% (0.6 to 0.8), R_topIs 15-25
% Values are obtained. The horizontal lines in FIGS. 10E and 10F are doubled.
3T mark length during fast playback = 3T space length = 231 × 3
× 1/2 = 346.5 (nsec). Mark length,
A deviation of about ± 10% is usually acceptable for the space length.
Therefore, it may be within ± 30 to 40 nsec,
From the figure, there is almost no deviation of mark length and space length.
It can be seen that it is within the allowable range. Similarly, Pw = 15 to
At 16 mW, the mark length and space between 4T and 11T
The desired length is within the range of about ± 10%.
The cut length and space length were obtained. FIGS. 10A and 10B
The horizontal line in the graph of 3T indicates the 3T jitter standard upper limit value at the time of 2 × speed reproduction =
= 35 × 1/2 = 17.5 (nsec). Either
Good jitter of 17.5 nsec or less even at a linear velocity of
-Values have been obtained. In summary, at any linear velocity
Good recording characteristics are obtained, and 4 to 10 times speed
Is based on the recording pulse division method of the CD-RW standard
Good recording characteristics are obtained. Next, at 2 to 10 times speed
Fig. 11 shows the evaluation results of the overwrite durability in
You. Repetition at Pw / Pe = 15mW / 7.5mW respectively
(A) 3T mark when returning overwriting is performed
Overwrite of jitter, (b) 3T space jitter
Indicates the number dependency. CD-RW at any linear velocity
The overwrite durability of 1000 times required for
Sufficiently satisfied. In addition, Table 1 shows that
Pulse division method, recording power, erasing power and 3T
The / 11T overwrite erase ratio is summarized. 3T / 11
The T overwrite erase ratio is the 3T mark and 3T space.
11T mark and 11T
Overwritten a single period signal consisting of T space
This is the erase ratio of the 3T signal at the time. The linear velocity is 1.times.
The speed was expressed as 2 m / s. [0205] [Table 1] As shown in Table 1, at 1 × to 6 × speed,
A T / 11T overwrite erase ratio of 29 to 30 dB was obtained.
Even at a high linear velocity of 8 ×, Pw = 16
Sufficient erasure of 28 dB when mW and Pe = 8 mW
The ratio has been obtained. 27dB at 10x speed
High erasing ratio is obtained. Also, the above disk
At the innermost circumference of the recording area (22 mm radius) at 4 × speed,
CA at 10x speed at the outermost periphery of the area (radius 58mm)
Rotate in V mode and shift the radial position about every 5mm
The reference clock corresponding to each radial position is
The recording was done with a lock. This disc is heated to 80 ° C / 85% R
500 hours after entering the accelerated test of H (relative humidity)
Degradation of the recorded signal is hardly observed even after a lapse of time
Was. The jitter is 17.5 ns or less at 2 × speed reproduction,
Modulation degree m₁₁Also hardly decreased, 90% of the initial value
The above was maintained. (Embodiment 2) In the above basic example, the following
The disc was manufactured as described above, and recording was performed. Recording layer I
n₈ Ge_Five (Sb_xTe_1-x)₈₇And x as 74.
Except for the three compositions 4, 7, and 76.3
A disk was produced in the same manner as in Example 1. NA = 0.55
The overwrite characteristics were evaluated using Tester 1 of the above.
At 2, 4, 6, and 8 times speed, Pe / Pw = 0.5
Pw is changed by 1 mW in the range of 9 to 20 mW as constant
Then, the jitter between 3T marks was measured. Recording pulse division
The method is the same as in the first embodiment, m = n-1, α₁ = 1, α_i= 0.5 (2 ≦ i ≦ m), β_m= 0.5, α_i+ Β_i-1 = 1.0 (2 ≦ i ≦ m)
did. That is, in accordance with the CD-RW standard shown in FIG.
Pulse division method. Note that in any case where x is 8
The 3T / 11T overwrite erase ratio at double speed is P
It was 30 dB or more at w = 15 to 18 mW. Obera
FIG. 12 shows the evaluation results of the site characteristics. Each (a) x
= 76.3, (b) x = 75.4, (c) x = 74.4
In the case of, the linear velocity and recording
This indicates the word dependency. The measurement was actually performed on the grid points shown in FIG.
The jitter value at the measurement point is shown as a contour map (ma
(Using EXCEL97 software manufactured by Icrosoft).
Contour lines are obtained by the data interpolation function of the software used.
Some constrictions and distortions are seen, but grasp the whole picture
There is no hindrance. (A) to (c) of FIG.
The lower the jitter, the higher the linear velocity
In each case, the jitter is 17 ns.
c (34 nsec in 1x speed) or less 4 to 8 times
Speed (4.8 to 9.6 m / s) can be covered. Devi
The operation is also within the standard range. In FIG. 12B,
CD-compatible quality signal recording from 2x to 8x speed
It was possible. The disc shown in FIG.
Drive (CRW4416 made by Yamaha CRX12 made by Sony)
0E and Ricoh 7040AD)
In both cases, good recording is possible and the recorded signal
Block error rate is single digit, at least 4 times faster
Compatibility was confirmed. 80 ° C / 85% RH
(Relative humidity) acceleration test, 500 hours
Almost no deterioration of the recorded signal even after the lapse
Was. The degree of modulation maintained 90% or more of the initial value. (Embodiment 3) In the above basic example, the following
The disc was manufactured as described above, and recording was performed. G for recording layer
e_Five Sb₇₃Te_{twenty two}(Sb / Te ≒ 3.32)
Produced a disk in the same manner as in Example 1. At 8x speed
The 3T / 11T overwrite erase ratio is Pw / Pe =
It was 31 dB at 17 mW / 8.5 mW. Implementation
The overwrite characteristics were evaluated in the same manner as in Example 2. FIG.
FIG. 12 shows a contour map of jitter similar to that shown in FIG. Sb /
Since the Te ratio is higher than Examples 1 and 2, the low jitter region is high.
Although it is biased toward the linear velocity side, the CD-RW
Good overwrite characteristics with pulse division method conforming to the case
The nature was able to be realized. (Comparative Example 1) The recording layer was made of Ge_Five Sb₆₈Te₂₇
Implemented except for (Sb / Te ≒ 2.52 <2.57)
A disk was produced in the same manner as in Example 1. As in the first embodiment,
When evaluation was performed with Star 1, the erasure ratio was not good even at 4 × speed.
It ’s a bit of a foot, and it ’s impossible to overwrite at 8x speed.
there were. 3T / 11T overwriting at 8x speed
The ratio was less than 20 dB. Note that the pulse division method
Even if it is changed, the 1 × speed reproduction jitter is not less than 35 ns.
I didn't. (Comparative Example 2) The recording layer was made of Ge_Five Sb₇₇Te₁₈
Example except that (Sb / Te ≒ 4.28> 4.0)
A disk was prepared in the same manner as in Example 1. Test in the same manner as in Example 1.
When the evaluation was carried out with the
The 1T overwrite erase ratio is Pw / Pe = 17 mW /
It was 32 dB at 8.5 mW. However, CD at 4x speed
-Evaluated by pulse division method based on RW, amorphous
Mark recrystallization is remarkable, and 2 × speed reproduction jitter is 17.5.
nsec or less (1x speed reproduction jitter 35 nsec or less)
No such characteristics were obtained. Also, depending on the crystal grain
Due to the high noise, when recording at 8x speed, playback at 2x speed
Jitter of 17.5 nsec or less cannot be obtained. (Comparative Example 3) The recording layer was made of Ge₁₂Sb₆₇Te_{twenty one}
(Sb / Te ≒ 3.2) Same as Example 1 except that
A disk was made. When the same evaluation as in Example 2 was performed
Roller, 3T / 11T overwrite erasure at 8x speed
The ratio is 30 dB at Pw / Pe = 17 mW / 8.5 mW.
Was. However, the overall jitter is high, and at 8x speed it is 2x speed
Reproduction jitter 17.5 nsec or less (1 × speed reproduction jitter 3
(5 nsec or less) could not be obtained. (Examples 4 and 5, Comparative Examples 4 and 5)
InGeSbTe-based or as a recording layer for CD-RW
Same as Example 1 except that a conventionally known InAgSbTe system was used.
A disk was prepared as described above. Specific composition of each recording layer
-2. [0215] [Table 2] The recording layers of Comparative Examples 4 and 5 were CD-R
W Standard (Orange Book Part 3, Version 2.0
Standard CD) that has 1 to 4 times speed compatibility based on
The recording layer satisfies the RW standard.
The same pulse division method as in (2) is applied). InGeSb
The linear velocity dependency is Sb / T for both Te and InAgSbTe.
It is almost uniquely determined by the e ratio. And Comparative Examples 4 and 5
In the recording layer, the amount of Sb is relatively increased, and Sb / Te = 2.
The values of 95 are Example 4 and Example 5. The media of Examples 4 and 5 are 4 to 8 times speed.
In the second embodiment, a good
Bar light properties were possible. Example 4 and Example 5
3T / 11T overwriting at 8x speed of medium
Both ratios were 28 dB. Both are Pe / Pw =
0.5. These discs were kept at 80 ° C / 85
% RH environment before and after 100 hours acceleration test
The characteristics are summarized in Tables 3 and 4. Table 3 shows 4x speed recording
After that, Table-4 shows that after 8x speed recording (in each case,
To the acceleration test and recorded after 100 hours
This is a re-evaluation of the signal characteristics. [0218] [Table 3] [0219] [Table 4] As can be seen from Tables 3 and 4, the examples
Disk No. 4 is an existing 1 to 4 × speed compatible medium (Comparative Example 4,
Sb / Te to make Comparative Example 5) compatible with higher linear velocities
Even if the ratio is high, it is excellent not only in initial characteristics but also in stability over time.
Media can be provided. On the other hand, the Sb / Te ratio
In the disk of the fifth embodiment with a higher
However, after 100 hours accelerated test, the modulation degree decreases and jitter increases.
It was remarkable. The amorphous mark disappears and the signal amplitude decreases
In view of the stability over time of the amorphous mark,
The disc is better. Note that the medium of Example 4 was
The acceleration test was continued for up to 500 hours, but was recorded at the beginning.
The signal which has been hardly degraded has a modulation degree m₁₁Also early
More than 90% of the value was maintained. From this, it can be seen that the Sb of the 1 to 4 × speed compatible medium is
Simply increasing the / Te ratio does not result in a medium for high linear velocity.
I understand that there is no. The present inventors set these recording layer materials to 8
First by applying to double-speed compatible CD-RW and conducting comparative studies
Thus, the specific effect of the GeSbTe-based recording layer becomes apparent.
It was. (Embodiment 6) In the above basic example, the following
The disc was manufactured as described above, and recording was performed. On the board
(ZnS)₈₀(SiO_Two )₂₀The lower protective layer consisting of 10
5 nm, In ₈ Ge_Five Sb₆₆Te_{twenty one}Recording layer consisting of 1
9 nm, (ZnS)₈₀(SiO_Two )₂₀Consisting of upper protection
The layers were provided in this order with a thickness of 45 nm.
l_99.5Ta_0.5 (10 nm) / Ag (200 nm)
A disc was created in the same manner as in Example 1, except that
Made. At this time, after forming the film up to the AlTa reflective layer,
Leave open for several hours and allow the surface to oxidize naturally,
After providing the oxide layer, the Ag layer was sputtered. Oxidation of interface
The layer is for preventing interdiffusion between Al and Ag. Last
A UV curable resin layer of about 4 μm was provided on the two-layer reflective film.
The sheet resistivity of the entire two-layer structure is 0.23Ω / □.
Was. Evaluation was performed in the same manner as in Example 2 using the tester 1.
The results obtained are shown in FIG. As good as Example 2
-Overlite characteristics were obtained. At 8x speed, Pw / Pe =
3T / 11T overwrite erase ratio at 16mW / 8mW
Was 31 dB. Also, R_top= 17%, m₁₁=
0.71. At 4 × speed, Pw / Pe = 15 mW /
R at 7.5mW_top= 17%, m₁₁= 0.65
Was. (Embodiment 7) In the above basic example, the following
The disc was manufactured as described above, and recording was performed. Similar substrate
On top, (ZnS)₈₀(SiO_Two )₂₀Lower protective layer consisting of
To 100 nm, In_FiveGe_Five Sb₆₇Te_{twenty three}Record consisting of
21 nm layer, (ZnS)₈₀(SiO_Two )₂₀Consisting of
Part protection layer 40 nm, Al_99.5Ta_0.5 Reflective layer consisting of
Is set to 250 nm and the ultraviolet curable resin layer is set to about 4 μm.
They were provided in order. This Al_99.5Ta_0.5 Volume resistivity of reflective layer
ρ_vIs 100 nΩ · m, area resistivity ρ_sIs 0.4Ω / □
Met. Using a tester 1 with NA = 0.55,
At 2, 4, 6, 8, and 10 times speed, the EFM modulation signal
Tried bar light. Example of recording pulse strategy
M = n-1 as in 2, T changes in inverse proportion to linear velocity
And the recording density is constant, α₁T and α_iT (2 ≦ i
≦ m), α_i+ Β_i-1(2 ≦ i ≦ m) depends on the linear velocity
Constant, and β_mOnly T is possible according to the line speed
A strange method was used. That is, α₁T = 23.1
n, α_iT = 13.9 ns (2 ≦ i ≦ m). Oh
Bar light characteristics are 3T after 10 times overwriting.
The data, mark length, and modulation were measured and evaluated. For each linear speed
Table 5 summarizes the recording pulse strategies used. Linear velocity
Is 1x speed 1.2m / s, and how many times it is
Expressed. T = 231 ns at 1 × speed 1.2 m / s
ec. [0225] [Table 5] In any case, in the above Pw,
Reflectivity R_top17%, modulation degree m₁₁65-70%, Ashin
Metrics within ± 10% were obtained. Also, at 10x speed
And α_iWhen (i = 2 to m) is 0.5, 3
T jitter is 25 nsec, α_i(I = 2-m)
Almost the same overwrite characteristics as in the case of 0.6 were obtained.
Was. From Table 5, the recording pulse width itself is fixed,
Change the clock cycle according to the linear speed, and
Off pulse section β_mThe pal that increases as the linear velocity decreases
By using the partitioning method, a relatively simple recording
It can be seen that the loose generation circuit can handle a wide linear velocity range
You. (Embodiment 8) In the above basic example, the following
The disc was manufactured as described above, and recording was performed. On the substrate,
(ZnS)₈₀(SiO_Two )₂₀97 of lower protective layer consisting of
nm, In ₈Ge_Five Sb₆₆Te_{twenty one}Recording layer consisting of 19
nm, (ZnS)₈₅(SiO_Two )_FifteenUpper protective layer consisting of
To 40 nm, Al_99.5Ta_0.5 250 reflective layers
nm, the UV curable resin layer is about 4 μm and provided in this order.
Was. This Al_99.5Ta_0.5 Volume resistivity ρ of reflective layer_vIs 1
00nΩ · m, area resistivity ρ_sIs 0.4Ω / □
Was. Tester 1 with NA = 0.55 and tester with NA = 0.5
Star 2 was used to evaluate the overwrite characteristics. 2,
Pw = 9-20 mW at 4, 6, 8 and 10 times speed
Up to 1 mW, and Pe / Pw = 0.5,
The jitter between 3T marks was measured by changing Pw. Izu
At these linear velocities, the 3T / 11T overwrite erase ratio is Pw
= 15-20 mW and more than 25 dB. Pulse strike
The strategy is fixed to the strategy in Fig. 1, and the data
Only the reference clock cycle of 3 is changed in inverse proportion to the linear velocity.
T jitter was measured. The results are plotted in a contour map similar to FIG.
FIG. FIG. 17A shows the case where NA = 0.5.
(B) shows the case where NA = 0.55. Any place
In both cases, the jitter is 17.5 ns from 4 times speed to 10 times speed.
Are obtained. Also, when NA is large
In this case, a wider linear velocity margin is obtained. (Embodiment 9) In the above basic example, the following
The disc was manufactured as described above, and recording was performed. Similar substrate
On top, (ZnS)₈₀(SiO)₂₀The lower protective layer consisting of
100 nm, Ga_FiveGe_FiveSb₆₈Te_{twenty two}Recording layer consisting of
20 nm, (ZnS)₈₀(SiO)₂₀Upper part consisting of
Protective layer 40 nm, Al_99.5Ta_0.5Reflective layer consisting of 2
50 nm, the ultraviolet curable resin layer is about 4 μm, and in this order
To make a rewritable compact disc. This A
l_99.5Ta_0.5The volume resistivity ρv of the reflection layer is 100 nΩ ·
m and the sheet resistivity ρs were 0.4Ω / □. NA =
Using a tester 1 of 0.55,
As a result of measurement, at 8 × speed and 10 × speed, 3T /
11T overwrite erase ratio of 25 dB or more is obtained.
Was. Furthermore, the linear velocity of jitter and the recording
FIG. 18 shows the result of measuring the power dependence. Using
The recording path strategy is m = n-1, α₁= 1, α _i=
0.5, β_m= 0.5, α_i+ Β_i-1= 1 (2 ≦ i ≦ m
Constant with respect to i), and constant at Pe / Pw = 0.5.
You. [0229] From the 4x speed (4.8 m / s) to the 10x speed (1
At 2 m / s), good jitter was obtained. Jitter
At the recording power at which the modulation is 0.6 to 0.8, R
_topAbout 17%, within ± 10% of asymmetry
Was. The recorded medium is subjected to an acceleration test cycle of 80 ° C./85% RH.
After playing for 500 hours,
Signal modulation depth, R_top, Jitter and asymmetry are almost
Almost unchanged. Especially the modulation depth is the value before the acceleration test
Of 90% or more. (Embodiment 10) In the above basic example, the following
A disk was manufactured and recorded as described above. Similar group
(ZnS) on the plate₈₀(SiO_Two)₂₀Lower protective layer consisting of
95 nm, In_ThreeGe_FiveSb₇₁Te_{twenty one}Recording layer consisting of
Is 16 nm, (ZnS)₈₀(SiO_Two)₂₀Upper part consisting of
The protective layer is made of 38 nm, an Al alloy (Mg 1.01 at.%,
Si 0.85 at%, Mn 0.33 at%, Ti 0.0
02at%, other inevitable impurities up to 0.1at
% Included. As a weight ratio, Mg 0.91% by weight, Si
0.88% by weight, Mn 0.67% by weight, Ti 0.014
% By weight), a UV curable resin
A rewritable compact with layers of about 4 μm provided in this order
A disk was made. Volume resistivity of this Al alloy reflective layer
ρv is 90 nΩ · m, and sheet resistivity ρs is 0.36 Ω / □
Met. Over using tester 1 with NA = 0.55
-When the write erase ratio was measured,
Overwrite erase ratio of 3T / 11T at 2x speed
25 dB or more was obtained. Further, the same jig as in Example 8
The results of measuring the linear velocity and recording power dependence of the
As shown in FIG. The recording pulse strategy used is m = n
-1, α₁= 1, α_i= 0.5, β_m= 0.5, α_i+
β_i-1= 1 (constant for i where 2 ≦ i ≦ m), Pe /
It is constant at Pw = 0.5. 6 times speed (4.8m / s)
Good jitter at 12x speed (14.4 m / s)
was gotten. Modulation depth at recording power that minimizes jitter
0.6-0.8, R_{to p}About 17%, asymmetry ± 1
Within 0% was obtained. (Embodiment 11) In the above basic example, the following
A disk was manufactured and recorded as described above. Similar group
(ZnS) on the plate₈₀(SiO_Two)₂₀Lower protective layer consisting of
97 nm, In_ThreeGe_FiveSb₇₂Te₂₀Recording layer consisting of
15 nm, (ZnS)₈₀(SiO_Two)₂₀Upper part consisting of
38 nm protective layer, Al_99.5Ta_0.5Reflective layer consisting of
250 nm, UV curable resin layer about 4 μm,
To make a rewritable compact disc. this
Al_99.5Ta_0.5The volume resistivity ρv of the reflective layer is 100 nΩ
M, the sheet resistivity ρs was 0.4Ω / □. Long axis approx.
100 μm (radial direction), short axis about 1.3 μm (circumferential direction)
Laser beam with a wavelength of about 830 nm focused on the recording layer
To perform initial crystallization. The focused light beam is
The disk so that it is scanned at 2.5 m / s
Rotate and rotate about 50 μm half a disc
700-900mW power while moving in radial direction
Was continuously irradiated. Irradiated twice in the same place
Will be. By the initial crystallization operation, the unrecorded state
The emissivity is the reflection of the erased state during overwrite recording described later.
It was almost the same as the rate. The following evaluation of this example is
Evaluation using a tester 2 having an optical system of NA = 0.5
Was done. The clock cycle is 231 times as fast as the CD linear velocity.
It was set to nanoseconds and changed in inverse proportion to the linear velocity. The playback conditions are
Assuming a constant value of 1.2 m / s, direct comparison of jitter etc. is possible.
It was to so. First, 3T patterns are applied 9 times to the unrecorded area.
After the overwrite recording, turn on the 11T pattern 10 times.
And the erase ratio was measured. Pe / Pw = 0.
Overwrite erase by changing Pw, keeping it constant at 5
The Pw dependence of the ratio was evaluated. The results are shown in FIG. Playback
Was performed at 1 × speed. As shown in FIG.
Secured overwrite erase ratio of 25dB or more up to double speed
This allows use up to 12x speed, but 10x speed
Power, especially at 10x speed
The margin has widened. FIG. 20 shows that Pw is 14-18 mW,
If Pe / Pw = 0.5, overwrite erase ratio 25
Since it was found that dB or more was obtained, Pw =
Provisional recording and erasing of 15 mW, Pe / Pw = 0.5
Consider the recording pulse strategy as the power below.
Went like so. Optimal recording pulse division at each linear velocity
Let m = n-1, α₁= 1, α_i+ Β_i-1= 1 (2 ≦
i ≦ m) and α_i(Constant with 2 ≦ i ≦ m), β_mTo
Variable as 3T mark or between marks (space)
The worse value of jitter (3T jitter) is almost the minimum.
And the degree of modulation is 0.6 or more, and the asymmetry is ± 10% or less.
I found a division method that would fit inside. 4 times in Fig. 21
Of 3T jitter at high speed and 10 times speed_iAnd β_mDependence
FIG. The measurement points are also on the grid points.
Automatically interpolated by Microsoft Excel
It is carried out. In addition, the measurement uses the EFM random pattern.
Performed after 10 times overwriting, taking into account erasing performance
This is the result. Reproduction was performed at 1 × speed. 10 times faster
Where α_i= Around 0.5, β_m= 0.3-0.6
The minimum value of the jitter is obtained. Also at 4x speed
Is α_i= 0.3-0.35, β_m= 0.5-0.6
The minimum value of the jitter is obtained. Next, Pe / Pw was set to 0.5.
Instead of the above, when the recording pulse strategy is 4 × speed, α₁
= 1, α_i= 0.3, β_m= 0.5, α at 10x speed₁
= 1, α_i= 0.5, β_m= 0.3 and Pe /
Changes in 3T jitter when Pw and Pw are changed
Examined. FIG. 22 shows the results. Pe / Pw ratio is 4x speed,
It is preferable that both 10 × speed be smaller than 0.5.
Pw = 0.4-0.5 Wide Pw margin
It is understood that it is preferable. Note that this figure shows
However, if Pe / Pw is greater than 0.6, the overall
Characteristic, especially on the high Pw side, the characteristics are rapidly deteriorated. 4
Wide recording power margin at both double speed and 10x speed
Was selected so that Pe / Pw = 0.43. The recording power is 17 at any double speed.
mW was selected. Under these conditions, at 4, 8 and 10 times speed
Α_i, Β_mFIG. 23 shows the result of the dependency measurement again.
You. Reproduction was performed at 1 × speed. At 4 and 10 times speed
Optimal α_i, Β_mIs almost the same as in FIG.
Especially at 10 × speed, the jitter is reduced and α_iAgainst changes in
And a wider margin was obtained. At 8x speed, α_i=
0.4-0.5, β_m= 0.2 to 0.5, minimum jitter
Values have been obtained. Similar results were obtained at 6x speed.
Therefore, the medium in this embodiment is α₁When constant at = 1
At each double speed, α_i, Β_m± 0.5 with respect to 0.5.
25 for optimum recording pulse width at each double speed.
I found that I could get a strategy. Also, α₁Constant
As the linear velocity becomes lower, α_iPulse strike that reduces
It is preferable to use a strategy, β_mIs about 0.3
It is preferable to keep it constant or to increase the value as the linear velocity decreases.
I understand. Therefore, at 4 × speed α₁= 1, α_i= 0.2
5, β_m= 0.5, α at 8x speed₁= 1, α_i= 0.4
(2 ≦ i ≦ m), β_m= 0.3, α at 10x speed₁= 1,
α_i= 0.5, β_m= 0.3 and Pw at all linear velocities
= 17mW, Pe / Pw = 0.43 and EFM Lander
Evaluation of the overwrite characteristics of the
Even at double speed of deviation, 3T jitter is 35 ns or less, R_top= 1
6-18%, modulation degree m₁₁= About 0.7, asymmetry
Values of 0-10% were obtained. This signal quality is
Playback at low error rate with CD-RW compatible playback system
It was at a possible level. Such a recording pulse strategy
Gee generates a recording pulse designed based on the current standard
It has been confirmed that it can be easily realized with a circuit.
Based on technology, CLV format, 4, 6, 8 and 10 times faster
Suitable for recording. On the other hand, at 10 times speed α₁= 1, that is, α
₁T = 23.1 ns, and this time length is constant at each double speed.
Α₁Is changed at 4 × speed, α₁=
Α at 0.4 and 8x speed₁= 0.8. in this way,
Α at 10x speed₁= 1, α at 8x speed₁= 0.8 at 4x speed
α₁= 0.4, α of 3T jitter_i(2 ≦ i ≦ m)
And β_mFIG. 24 shows the dependency. 1x playback
Performed at speed. Here, 4x speed, 8x speed, 10x speed
In particular, Pe / Pw = 0.43 and Pw = 17 mW.
In addition, about 10 times speed, on the same conditions as the case of FIG.
is there. That is, at 10 × speed, α_i= 0.45-0.
55, β_mFIG. 21 shows that the jitter is minimized at about = 0.3.
Is the same as Here, at 8 × speed, α_i= 0.35
0.45, β _m= 0.3-0.5, α at 4x speed_i=
0.2 or more (measurement is up to 0.3), β_m= About 0.3 or more
The minimum value of the jitter was obtained (measurement was up to 0.65). At 4 ×, 8 ×, and 10 × speeds, α₁
T = 23.1 nanoseconds, α_iT = 11.6 ns (2 ≦ i
≤ m) and β_m= 0.3 constant
Or β at 4x speed_m= 0.5, β at 8x speed_m= 0.35,
Β at 10x speed_m= 0.3 as the linear velocity becomes lower_mThe size
Good overwriting in the range of 4 to 10 times speed
Becomes possible. That is, the medium in this embodiment is a conventional medium.
CLV system based on recording pulse strategy and book
Recording pulse stratification in CAV system newly proposed in the invention
A wide range of applications that can be used for any of the technologies
You. In the following, based on the result of FIG.₁T = 23.
1 ns, α_iCAV method to keep constant at T = 11.6 ns
Attention is paid to the recording pulse strategy suitable for. further,
In order for the position at a radius of 23 mm to be exactly 4 times faster,
Rotate the disk in CAV mode at about 2000 rpm
Was. The outermost circumference of the recording area has a radius of about 58 mm and a radius of 58 mm
Is about 10 times speed. The linear velocity and the data
The clock cycle is changed as shown in Table-6, and in CAV mode
Was recorded. m = n-1, Pw = 1
7 mW, Pe / Pw = 0.43, α₁T = 23.1 nano
Seconds, α_iT = 11.6 nanoseconds (all 2 ≦ i ≦ m
is constant at all radii.
Was. β_mOnly the speed was changed according to the linear velocity. That is,
When the speed is 10 times at the outer circumference, it is set to 0.3 and the innermost circumference
When the speed becomes 4 times as high as 0.5, the intermediate radius (line
In (speed), this intermediate value was used by linearly interpolating. each
The recording pulse strategy used for the radius is
The value indicated by the ratio to the cycle T, that is, α₁, Α
_i, Β_mAre also shown in Table-6. In addition, recorded in the same table
3T playback at 1x speed playback of already used EFM random signal
Pace jitter, modulation, and asymmetry were shown. Reflection
Rate R_topWas constant at about 18% in each case.
The deviation of the mark length and mark length of each mark
It was good in less than ± 40 nanoseconds. Other push
Signal and wobble signal are determined by the groove shape of the board.
As a result, a value equivalent to that of the existing CD-RW was obtained. [0240] [Table 6]As can be seen from Table 6, a very simple description
Recording pulse strategy to cover a wide linear velocity range
Recording by the CAV method with the innermost circumference being about 4 times faster
You can see that it can be realized. This allows ads with different radii
Do not change the rotation speed when accessing the
Also, in the recording pulse strategy, the clock cycle
And β_mOnly adjusting the recording power, etc.
Recording can be performed as is, and access performance is greatly improved.
I can do better. Note that β_m= 4 to 6 even if constant at 0.3
The jitter at double speed only deteriorates by at most 2-3 nanoseconds.
, Β_mRecording can be performed by the CAV method even if the recording is constant. Book
The medium of the example is suitable for the above CAV at 4 × speed and 10 × speed.
After recording the EFM random pattern with the
Released for 500 hours in an environment of 0 ° C / 85% RH (relative humidity)
After the measurement, the recorded signal was measured again.
Data, deviation, R_topAnd the modulation depth almost change
I didn't. Modulation degree should be more than 90% of initial value
Had been maintained. Jitter is almost unchanged
Was. At 4 × speed and 10 × speed, the text
Using Star 2 at each linear velocity,
Recording pulse strategy, Pw = 18 mW, Pe /
Assuming that Pw = 0.5 and Pb = 0.8 mW,
After performing bar light, even after 1000 times, 1x speed
The 3T space jitter during playback is less than 35 nanoseconds,
Excellent repetitive overwrite durability was exhibited. With the same composition and layer configuration as above,
Prepare several disks with write characteristics, and
The study was carried out under different initialization conditions. Long axis about 100μm
(Radial direction), converges on short axis about 1.3μm (circumferential direction)
Laser light with a wavelength of about 830 nm was applied to the recording layer from the substrate side.
Irradiating and performing the initial crystallization
The scanning speed of the bundled light beam is 2, 2.5, 3, 7, 10 m /
Initialize each disk by changing s
Was. Radial beam about 50μm per disk rotation
Was moved. Initialization laser power is 500-150
At each scanning speed in the range of 0 mW,
Crystallization is performed, and the value in the formula (F1) is 10% or less.
I chose to be below. However, at a scanning speed of 10 m / s
In the initialized disk, the reflectance R2 of the initialized portion is large.
It is considered that the recording layer has become amorphous after being partially melted.
I got it. The radius of the other disks was 56.3 in Table-6.
EFM with tester 2 under 10 × speed recording conditions in mm
Initial recording of random pattern, overwriting once, 1
Overwriting was performed 0 times. 2-7m / s range
Even at the scanning speed of the deviation, the initial recording and 10 times overlap
The 3T space jitter after the site was 18 to 22
Scanning of initialization beam in nsec, 20-25 nsec
There was almost no speed dependence. However, after the first overwrite recording,
T space jitter is 45 nsec at 2.5 m / s, 2.5
33nsec at m / s, 28nsec at 7m / s, 7m
/ S was 23 nsec. After the first overwrite
The rise of the jitter of the crystal
It is thought to be due to the difference in size or crystal orientation.
And almost all are erased after 10 times overwriting
It is considered that the jitter is reduced because of the state. this
From the viewpoint, the initialization condition is generally in the range of 2.5 to 7 m / s.
It turned out to be desirable. (Embodiment 12) In the medium of the embodiment 11, α₁
T = 23.1 nanoseconds, α₁T = 11.6 ns (2 ≦ i
.Ltoreq.m-1) while maintaining the same as in Table-6.
(1.2 m / s, T = 231 ns), 2 × speed (2.4
m / s, T = 116 ns)
Tried. Pw = 17mW, Pe = 0.43 is any field
In this case, it was the same as Table-6. Furthermore, α₁= 1 fixed
α₁And β_mWas also optimized for each linear velocity. This
In the case of, the recording radius position is about 40mm and the disc rotation
By adjusting the number, 1 × speed and 2 × speed at the radius position
It was adjusted to become. As shown in Table 7, the same as Table 6 at 1x speed
3T space jitter when reproduced, β_m, Modulation depth,
The symmetry values were summarized. Β_mEach
Good overwriting is possible by adjusting the linear velocity.
Was. [0247] [Table 7] Further, the medium of Example 11 was increased by a factor of 12
Tester at high speed (14.4m / s, T = 19.3nsec)
Using No. 2, overwrite recording was performed. m = n-
1, α ₁= 0.5, β_m= 0.3, α_i+ Β_i-1= 1 (2 ≦
i ≦ m), Pw = 18 mW, Pe / Pw = 0.4
Overwrite 10 times using recording pulse strategy
After that, reproduction was performed at 1 × speed. 3T space space
29.3 nanoseconds, 11T space jitter 31.8 na
Nosec, modulation degree 0.61, asymmetry -0.093
Good overwriting was possible. (Comparative Example 6) In the above basic example, the following
The disc was manufactured as described above, and recording was performed. On the substrate,
(ZnS)₈₀(SiO_Two)₂₀97 of lower protective layer consisting of
nm, In_FiveGe_FiveSb₇₀Te₂₀20n recording layer
m, (ZnS)₈₀(SiO_Two)₂₀Upper protective layer consisting of
40 nm, Al_97.5Ta_2.5Reflective layer 250n
m, about 4 μm of an ultraviolet curable resin layer,
A rewritable compact disc was manufactured. Reflective body
The product resistivity is 270 nΩ · m, and the area resistivity is 1.1 Ω / □.
Met. Using a tester 1 in the same manner as in Example 2
-Overlite characteristics were evaluated. The results are shown in FIG.
You. From FIG. 33, in the above compact disc,
Is very narrow in the region where the jitter is 17 nsec or less,
Can not cover a wide area from 4x to 8x speed
You can see that. [0250] According to the present invention, at least four times speed is achieved.
8 times while maintaining compatibility with the conventional CD-RW standard
High-speed recording at a high speed can be performed. Finally, CD-RW
Can increase the recording speed and transfer rate of music,
Record large amounts of data such as images and external storage
The use of CD-RW can be greatly expanded
You. Also, according to the present invention, only the conventional CLV mode is used.
CD-RW that has been recorded can be recorded in CAV mode
Can greatly reduce the power consumption of the drive.
Access speed and seek speed of CD-RW media
It will be improved. In addition, random packet recording is more efficient
Media for external storage devices of computers
Performance greatly increases.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory diagram of an example of a pulse dividing method according to the present invention. FIG. 2 is a schematic diagram of a reproduced waveform (eye pattern) of an EFM modulation signal. FIG. FIG. 4 is an explanatory diagram of the relationship between the conversion process, the heat radiation effect of the reflective layer, and the linear velocity during recording. FIG. 4 is an explanatory diagram of a pulse division method. FIG. FIG. 7 is a conceptual diagram showing an example of a configuration of a recording apparatus for realizing a recording method according to the present invention. FIG. 7 is a diagram showing an example of a flow for generating a reference data clock and recording in the present invention. FIG. 9 is a diagram showing another example of a flow for generating and recording a data clock. FIG. 9 is a diagram showing another example of a flow for generating and recording a reference data clock in the present invention. FIG. 10 is an overwrite in the first embodiment. Graph showing characteristics [Figure 11] FIG. 12 is a graph showing overwrite durability in Example 1. FIG. 12 is a graph showing overwrite characteristics in Example 1. FIG. 13 is a graph showing overwrite characteristics in Example 3. FIG. 14 is an overwrite characteristic in Example 6. FIG. 15 is a flowchart showing an example for achieving the recording method of the present invention. FIG. 16 is a conceptual diagram showing an example of a recording / reproducing apparatus of the present invention. FIG. FIG. 18 is a graph showing overwrite characteristics in Example 9. FIG. 19 is a graph showing overwrite characteristics in Example 10. FIG. 20 is a graph showing Pw dependency of an overwrite erase ratio in Example 11. FIG. 21 is a graph showing overwrite characteristics in Example 11. FIG. 22 is another graph in Example 11; FIG. 23 is a graph showing characteristics. FIG. 23 is a graph showing still another overwrite characteristic in the eleventh embodiment. FIG. 24 is a graph showing still another overwrite characteristic in the eleventh embodiment. FIG. 25 is a data arrangement along an ATIP address. FIG. 26 is a schematic view showing a meandering state of a guide groove of a medium or a meandering state of a pit row n. FIG. 27 is a schematic view showing an example of data arrangement of a medium of the present invention. FIG. 28 is a CD-ROM. FIG. 29 is a schematic diagram showing the structure of a block in a format. FIG. 29 is a schematic diagram showing the structure of a packet in a CD-ROM. FIG. 30 is a schematic diagram showing a CD-RW drive and a host computer when a P-ROM is used. Figure 31 is a flowchart showing a procedure of recording-reproducing by CAV method using the P-ROM [32] in ₃ Ge ₅ Sb ₇₀ Te ₂₂ film transmission electron microscopy Graph showing the overwrite characteristics in the electron beam diffraction image [33] Comparative Example 6 with

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) G11B 7/125 G11B 7/125 C 20/10 301 20/10 301Z 20/14 311 20/14 311 351 351A (72) Inventor Masae Kubo 1000 Kamoshita-cho, Aoba-ku, Yokohama-shi, Kanagawa Prefecture Mitsubishi Chemical Co., Ltd., Yokohama Research Laboratory (72) (Reference) 5D044 BC06 CC06 DE38 DE45 DE57 EF05 FG19 FG25 GL38 GM02 GM11 GM32 5D090 AA01 BB04 CC02 CC05 CC12 CC14 DD05 EE02 FF07 FF08 FF33 GG03 GG09 GG10 GG28 HH01 HH03 JJ12 HA03 DA03 HA05 DA035 HA52 HA57 HA60

Claims (1)

Upon recording the Patent Claims 1. A phase-change rewritable disc-shaped optical recording medium to an EFM-modulated plurality of mark lengths information and inter-mark lengths in the CLV system having a recording layer,
Assuming that the time length of one recording mark is nT (T is a reference clock cycle, n is an integer from 3 to 11), the erasing power Pe capable of crystallizing an amorphous phase between recording marks. The recording light is irradiated, and the time length (n-
j) Let T be α ₁ T, β ₁ T, α ₂ T, β ₂ T,..., α _m T,
β _m T, where m = n−1 or m = n−2,
_i (α _i + β _i ) = n−j (j is a real number satisfying 0.0 ≦ j ≦ 2.0), and the recording layer is divided within the time α _i T (1 ≦ i ≦ m). A recording light having a recording power Pw satisfying Pw> Pe is applied for melting, and 0 <Pb ≦ within a time β _i T (1 ≦ i ≦ m).
Overwriting is performed by irradiating recording light with a bias power Pb of 0.5 Pe, and a linear velocity of 1.2 m / s to 1.4 m / s is set as a reference velocity (1x velocity).
When 231 ns is set as the reference clock cycle at that time, (1) At 4 × speed, α ₁ = 0.3 to 1.5, α _i
= 0.2 to 0.7 (2 ≦ i ≦ m), α _i + β _i-1 = 1 to
1.5 (3 ≦ i ≦ m) (2) At 1 or 2 × speed, α ₁ = 0.05 to 1.
0, α _i = 0.05 to 0.5 (2 ≦ i ≦ m), α _i + β
_i-1 = 1 to 1.5 and (3 ≦ i ≦ m), (3) 6,8,10 and in any of the speed of 12 × _{speed, α 1 = 0.3~2, α i} = 0 .3 to 1 (2 ≦ i
≦ m), α _i + β _i−1 = 1 to 1.5 (3 ≦ i ≦ m). A method for recording on a rewritable optical recording medium. 2. At any linear velocity used, m is fixed, α ₁ = about 1, α _i = 0.3 to 0.6 (where i is 2 to m
Α _i + β _i-1 (where i is an integer of 3 to m)
Is a constant value, and α _i (where i is 2 to
2. The method for recording on a rewritable optical recording medium according to claim 1 , wherein (an integer of m) is monotonously decreased. 3. At any linear velocity used, m is constant and α ₁ T, α _i T (where i is 3 to m).
Integer), and alpha _i + beta _i-1 (where i is a recording method for the rewritable optical recording medium according to claim 1, constant value an integer) of 3～M. 4. The method according to claim 2, wherein m is constant at any linear velocity used, and α _i + β _i-1 = about 1 for all i (where i is an integer of 2 to m ). 4. The method for recording on a rewritable optical recording medium according to 3 . (5 ) α _i / α ₁ = 0.3 to 0.7 (where i
The method for recording on a rewritable optical recording medium according to claim 4 , wherein is an integer of 2 to m. 6. At any linear velocity used, β _m =
And 0 to 1.5, and claim 1乃 to increase the beta _m The lower or linear velocity to be constant at any linear velocity
6. The method for recording on a rewritable optical recording medium according to any one of Nos. 5 to 5 . 7. At any linear velocity used, α _i
T (1 ≦ i ≦ m) and β _i T (1 ≦ i ≦ m−1) are set to 10
7. The recording method for a rewritable optical recording medium according to claim 1 , wherein the recording time is at least nanosecond. 8. A CAV method in which a rewritable disc-shaped optical recording medium having a predetermined recording area is rotated at a constant angular velocity.
In recording FM-modulated information with a plurality of mark lengths, the linear velocity is 1.2 m / s to 1.4 m / s at the reference speed (1x speed).
When the disk is rotated so that the linear velocity at the outermost periphery of the recording area is at least 10 times faster, and the time length of one recording mark is nT (T is a reference clock cycle, and T changes in accordance with the radial position so that the product VT with the linear velocity V is constant.n is an integer from 3 to 11). The recording mark of Pe is irradiated, and the time length (n-
j) Let T be α ₁ T, β ₁ T, α ₂ T, β ₂ T,..., α _m T,
β _m T, (where m = n−1 α ₁ = 0.75 to 1.25, α _i = 0.25 to 0.75 (2 ≦ i ≦ m), α _i + β _i−1 = 1 to 1) 1.5 (3 ≦ i ≦ m)), Σ _i (α _i + β _i ) = n−
j (j is a real number satisfying 0.0 ≦ j ≦ 2.0), and the recording power satisfying Pw> Pe to melt the recording layer within the time α _i T (1 ≦ i ≦ m) The recording light of Pw is irradiated, and within the time of β _i T (1 ≦ i ≦ m), 0 <Pb ≦
Overwriting is performed by irradiating recording light with a bias power Pb of 0.5 Pe, and α ₁ and α _i + β _i-1 (i
= 3 to m) is constant, and α _i (i = 3 to m) decreases toward the inner circumference. 9. E at CAV method the rewritable disc-shaped optical recording medium is rotated at a constant angular velocity with a predetermined recording area
In recording FM-modulated information with a plurality of mark lengths, the linear velocity is 1.2 m / s to 1.4 m / s at the reference speed (1x speed).
When the disk is rotated so that the linear velocity at the outermost periphery of the recording area is at least 10 times faster, and the time length of one recording mark is nT (T is a reference clock cycle, and In accordance with the radial position, T is set so that the product VT with the linear velocity V is constant.
Changes. n is an integer from 3 to 11), between the recording marks, a recording light of an erasing power Pe capable of crystallizing the amorphous is irradiated, and for the recording marks, the time length (n −
j) Let T be α ₁ T, β ₁ T, α ₂ T, β ₂ T,..., α _m T,
β _m T, (where m = n−1, α _i / α ₁ = 0.3 to 0.7
(Where i is an integer of 2 to m), α _i + β _i-1 = about 1 (3 ≦ i ≦ m)), and） _i (α _i + β _i ) = n−
j (j is a real number satisfying 0.0 ≦ j ≦ 2.0), and the recording power satisfying Pw> Pe to melt the recording layer within the time α _i T (1 ≦ i ≦ m) The recording light of Pw is irradiated, and within the time of β _i T (1 ≦ i ≦ m), 0 <Pb ≦
Overwriting is performed by irradiating recording light with a bias power Pb of 0.5 Pe, and α _i T (i = 2 to m) and α _i + β _i-1 (i = 3 to m) are obtained at any radial position. A method for recording on a rewritable optical recording medium that is constant. 10. In any radius of a recording area,
10. The recording method for a rewritable optical recording medium according to claim 8 , wherein β _m = 0 to 1.5, and β _m is monotonically increased toward an inner circumference. 11. The at least a recording method for rewritable optical recording medium according to any one of claims 8 to 10 using a rewritable compact disc space radius 23mm~58mm the recording area. 12. At any radial position, α _i T
12. The method for recording on a rewritable optical recording medium according to claim 8, wherein (1 ≦ i ≦ m) and β _i T (1 ≦ i ≦ m) are set to 10 nanoseconds or more. Also 13. A Any used linear velocity, P
b, 請 Pw, and the value of Pe / Pw is substantially constant
13. The recording method for a rewritable optical recording medium according to any one of claims 8 to 12 . 14. A rewritable disk-shaped optical recording medium has a wobble groove having a wobble signal, which is frequency-modulated at ± 1 kHz with ATIP information at a carrier frequency of about 22.05 kHz in 1 × speed on a substrate. The carrier frequency is detected while rotating the disk at a constant angular velocity, the detected frequency is multiplied by 196 to obtain a data reference clock corresponding to the disk radius, and the ATIP signal is detected and detected. 14. The recording method for a rewritable optical recording medium according to claim 8, wherein a data reference clock synchronized with a synchronization pattern of the ATIP signal and rotation of the disk is obtained. 15. The rewritable disc-shaped optical recording medium has, on a substrate, A carrier frequency 22.05kHz in terms of 1x
A wobble groove having a wobble signal frequency-modulated to about 22.05 kHz ± 1 kHz by TIP information;
A clock mark is provided along the groove at a repetition frequency of 2 to 8 times 2.05 kHz. The clock mark is detected while rotating the disk at a constant angular velocity, and the repetition frequency of the clock mark is set. 14. The method for recording on a rewritable optical recording medium according to claim 8, wherein a reference clock of data is obtained by multiplying by a predetermined value. 16. The rewritable disc-shaped optical recording medium is provided with a wobble groove having a wobble signal having a constant carrier frequency when the linear velocity is constant, on the substrate, and the wobble is phase-modulated or at a specific position. claims wobble is granted the address information and the synchronization information by the lack, while rotating the disk at a constant angular velocity by detecting the frequency, obtaining a reference clock data by a predetermined factor the detected frequency Item 14. The recording method for a rewritable optical recording medium according to any one of Items 8 to 13 . 17. The rewritable disc-shaped optical recording medium has a structure in which absolute time information based on the Q channel of a subcode is previously EF.
M is recorded in the entire recording area becomes in a modulated signal, while rotating the disk at a constant angular velocity by detecting the EFM modulation signal, to any one of claims 8 to 13 to obtain the reference clock and address information of the data The recording method of the rewritable optical recording medium described in the above. 18. rewritable optical recording medium in advance C
Claims block structure in D-ROM standard is to be recorded in the entire recording area as EFM-modulated signal, while rotating the disk at a constant angular velocity by detecting the EFM modulated signal to obtain a reference clock and address information of the data Item 14. The recording method for a rewritable optical recording medium according to any one of Items 8 to 13 . 19. has a groove and a recording layer of the meandering spatial frequency fixed spiral accordance with signal modulated by a constant carrier frequency f _L0 and the address information, in place of the helical groove Means for rotating a disk having address information for identifying a recording block, which is a unit of recording information, and synchronization information for identifying the start position of the block, at a constant angular velocity about a central portion thereof, and a focused light beam for recording and reproduction Means for radially moving an optical pickup for generating a laser beam to a predetermined address; focus servo means for focusing a focused light beam on the recording layer; and scanning the focused light beam along the spiral groove. a groove tracking servo means for, conveying the groove meander frequency f _A0, means for detecting and decoding the address information and the block synchronization signal, Means for generating a recording data string mark length modulation in synchronization with the reference clock T of data having a start position and the frequency f _d0 of the recording block, and means for modulating the recording laser power corresponding to the recording data sequence An optical disk recording apparatus having a reference signal generator for generating a reference clock T of data that changes in inverse proportion to the radius when a focused light beam is moved in a radial direction to a recording block at a predetermined address; The reference clock at the radius is 1 / N (N is an integer)
By comparing the phase of the reference signal f _R0 obtained by dividing the frequency with the carrier frequency f _{A0 of the} meandering groove detected at the address, the reference clock frequency f of the data at a predetermined radius is obtained.
_d0 and f _A0 even f at any radial position _d0 = N · f _A0
An optical disk recording / reproducing apparatus, comprising: means for finely adjusting the number of revolutions of a disk so as to maintain the following relationship, and for achieving synchronization between the start position of a recording block and a data string to be written in the block. 20. _Tref (frequency f _ref ) is a reference clock of data at a reference radius R _ref at the start or end of the recording area of the optical disk, and ΔR is the radius width from the innermost circumference to the outermost circumference of the recording area. And the reference clock T (frequency f _d0 ) at the address calculated from a predetermined address where the recording of the data is to be performed is maintained such that the relation f _d0 = f _ref + (R−R _ref ) / ΔR is maintained. _20. The optical disk recording / reproducing apparatus according to claim 19 , wherein _d0 is changed according to a radius. 21. The method of claim 19 the control range of the rotational speed of the disk is ± 0.01ω ₀ within the reference rotational speed omega ₀
Or the optical disk recording / reproducing apparatus according to 20 . 22. carrier frequency f _L0 of the groove meandering 22.05
and the address information is an ATIP signal frequency-modulated at ± 1 kHz using f _L0 as a carrier frequency.
₀ is 1900~2200rpm claims 19 to 2
2. The optical disk recording / reproducing apparatus according to any one of 1. 23. Recording and reproduction of data with respect to an information area are performed while recording and reproduction are maintained at the same rotational speed.
A recording / reproducing method for a rewritable optical recording medium according to claim 8 . 24. an application program area in which data of the inner circumference or the outer circumference side continuous predetermined application program in the area of stored program area, the user data associated with at least said application program the remaining area is recordable A user data recording area is set, and the application program and user data are recorded in fixed-length packet units having the same file management structure, and reproduction of the application and recording of user data related to the application are performed. What is claimed is: 1. A recording / reproducing apparatus for performing recording / reproducing on / from a rewritable optical recording medium which is performed at a constant rotational speed, wherein said disk is CAV-rotated while accessing said specific area of said rewritable optical recording medium. App Program execution means for reproducing data of an application program and executing the program contents; information input means capable of inputting required information in accordance with the application program executed by the program execution means; Recording and reproducing means for accessing the user data area while rotating the CAV and recording information input by the information input means as user data. apparatus. 25. In the process of executing the application program, a predetermined demonstration is reproduced, and means for prompting the user to input information according to the demonstration, and accessing the user data area, and transmitting the input information to the user 25. The recording / reproducing apparatus according to claim 24 , further comprising: recording means capable of recording as data.