JP2001216650A - Recording method, disk manufacturing apparatus and recording medium - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To facilitate reading of control information. SOLUTION: In a cutting apparatus for manufacturing a master disc for duplicating an optical disc on which a pregroove on which a signal is recorded is formed, light emitted from a He-Cd laser 11 is spectrum-spread by an encoding unit 50. The intensity is modulated by the optical modulator 12 in accordance with the input data, and the light is condensed on a photoresist formed on the surface of the glass master 101 to form a latent image for the pre-groove. To record control information that has been spectrum-spread by wobbling.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording method for recording a signal on a disk-shaped recording medium, a disk manufacturing apparatus for manufacturing a disk master for duplicating a disk-shaped recording medium,
And a disk-shaped recording medium on which signals are recorded.

[0002]

2. Description of the Related Art Conventionally, a so-called CD-R is an optical disk which can be written only once and can be reproduced by a CD player corresponding to a so-called CD after writing.
(Recordable) is provided.

A so-called CD-R 201 has a polycarbonate-based transmission layer 201a, as shown in cross section in FIG.
It comprises a spin-coated organic dye recording layer 201b, a gold-deposited reflective film 201c, and a protective film 201d of an ultraviolet (UV) curable resin.

As shown in FIG. 10, an unrecorded so-called C
The D-R 201 has no pits, only a pre-groove (pregroove) 202 of a guide groove formed in advance. At the time of recording or reproduction, tracking servo is applied using this pre-groove 202.

[0005] The pregroove 202 is slightly meandering (wobb).
le: wobble) and this wobbling
Are FM-modulated. By demodulating this wobbling, time information indicating an absolute address on the optical disk can be obtained. This time information is stored in ATIP (absolute time in pre
groove), a so-called CD subcode (subcod
e) It corresponds to the Q channel. This is used for spindle servo control and recording location management.

[0006] Recording on the so-called CD-R 201 utilizes the pre-groove 202 while controlling the tracking and the spindle by servo, and irradiating a laser output according to data "1" or "0". This is done by controlling the strength.

The unrecorded so-called CD-R 201 has a substantially uniform high reflectance of about 65% to 70% over the entire surface. The portion irradiated with the strong laser output changes the optical properties of the recording layer 201b in the pre-groove 202 due to the heat and becomes a portion equivalent to a so-called CD pit having a low reflectance. On the other hand, the portion of the recording layer 201b where the laser irradiation was weak remains unchanged as a land having a high reflectance. Therefore, a row of pits and lands is formed according to data similar to that of a conventional so-called CD.

[0008] This is because physical pits such as CDs are not formed, but optically equivalent changes, that is, changes in the shape, refractive index, and absorption of the substrate occur.

The so-called CD-R2 recorded as described above
01 to a conventional so-called CD player or so-called CD-R
When the data is reproduced by an OM drive or the like, the pre-groove 202, whose optical properties are not so different from those before recording, has almost no effect on reading, and the formed pit row becomes dominant. Can be played.

While a so-called CD is stamped through a large-scale mastering process in a controlled factory, a so-called CD-R 201 is a low-cost so-called CD.
-R is directly written by an R recording device, so-called C
It is possible to create a disc of the same quality as D.

The layout of the so-called CD-R 201 is as follows:
As shown in FIG. 11, a power calibration area (power calibration area) is provided inside a lead-in area of a conventional so-called CD.
ea; PCA), program memory area;
PMA) has a special area.

That is, a so-called CD shown in FIG.
In the figure, a clamping area a, a lead-in area b, a program area c, and a lead-out area d are formed in order from the inner circumference to the outer circumference of the disk. On the contrary,
In the so-called CD-R 201 shown in FIG.
P is further added to the inner peripheral side of the so-called CD lead-in area b.
It has CM and PMA areas. The center line f of the disk is shown in the figure.

[0013] These areas are used only by so-called CD-R drives. General so-called CD-RO
The M drive cannot access this area.

The PCA is an area used for determining a laser output required for recording. In the case of a so-called CD-R, since pits are formed by the heat of a laser, the quality of a completed disk is greatly affected by the laser output during recording. For this reason, an optimum laser output must be precisely obtained prior to regular recording. Therefore,
The so-called CD-R drive writes dummy data while changing the laser output in the area of the PCA, and then reproduces that portion to check the state of the pits, thereby obtaining a laser output that provides an optimum recording state.

The PMA records the provisional TOC (tabl
e of contents) An area where information is recorded. This area is used in a so-called CD-R drive having a write-once function. The so-called CD TOC contains the table of contents information of the disc. In order to record the TOC, all recorded contents of the disc must be determined before recording. However, the so-called CD-
In the case of R, the TOC cannot be written because the entire contents of the disc are not determined at the stage of adding a record. Therefore, at the stage where the recording is being added, the information of the disk being recorded is recorded in the PMA, and when it is determined that no more recording is to be added, the information of the disk recorded in the PMA is copied to the TOC.

[0016]

By the way, CD-R2
In a recording disk such as 01, control information such as a recording address and a clock signal for controlling the rotation of the disk is embedded when the disk is created by wobbling of the pregroove. As shown in FIG.
In the pre-groove 202, wobbling is slightly formed, and an address at the time of recording called ATIP is used as position information of the blank disk.

Although the wobbling is delicate so as not to affect the recorded signal, reading becomes extremely difficult due to crosstalk from the recorded signal, the signal being recorded, or the recording signal of an adjacent track. Also,
Since the crosstalk becomes larger as the track pitch of the disc becomes smaller, it becomes more difficult to read the signal due to wobbling, which prevents an increase in the capacity of the recordable disc.

The present invention has been proposed in view of the above-mentioned circumstances, and provides a recording method for providing easy-to-read wobbling, and a disk for manufacturing a master disk for duplicating a disk having easy-to-read wobbling. An object of the present invention is to provide a manufacturing apparatus and a recording medium on which wobbling that is easy to read is formed.

[0019]

In order to solve the above-mentioned problems, a recording method according to the present invention is applied to a disk master for manufacturing a disk-shaped recording medium on which recording tracks for recording signals are formed. The recording method for forming a recording track includes a recording step of recording control information by wobbling along the recording track, and the recording step records the control information by spread spectrum.

A disk manufacturing apparatus according to the present invention is a disk manufacturing apparatus for manufacturing a disk master for duplicating a disk-shaped recording medium having a guide groove on which a signal is recorded. Is formed, and the guide groove forming means records control information that has been spectrum-spread by wobbling along the guide groove.

The recording medium according to the present invention is a disk-shaped recording medium on which a signal is recorded along a recording track, on which control information that has been spectrum-spread by wobbling along the recording track is recorded.

[0022]

Embodiments of the present invention will be described below with reference to the drawings.

First, a description will be given of a cutting apparatus for cutting an optical disc master.

In the cutting apparatus, the cutting of the master disc is performed by focusing a laser beam on a glass master coated with a photoresist and recording a signal in the form of a latent image. The cutting device records the control signal as a pre-groove at the same time as recording the signal.

The glass master on which the signal is recorded is developed with an alkaline solution to remove the exposed portion and form a relief on the resist surface.

The cutting device, as shown in FIG.
He-Cd laser 11, optical modulator 12 for modulating light emitted from He-Cd laser 11, and recording optical system 13 for performing processing for recording light from optical modulator 12 on glass master disk 101. And

In order to perform high-precision cutting,
It is preferable that the laser wavelength used is as short as possible. However, in terms of resist sensitivity and usable laser output, He is used.
A -Cd laser 11 is used.

The laser light emitted from the He—Cd laser 11 is
The intensity is modulated by the optical modulator 12 and expanded by the recording optical system 13 so that the laser light fills the entrance pupil of the condenser lens 15.

The optical modulator 12 includes an electro-optic (EO) modulator using an electro-optic effect and an acousto-optic (AO) modulator using an acousto-optic effect.

The cutting device includes a first half mirror 14, a condensing lens 15 for condensing the light transmitted through the first half mirror 14 and entering the glass master 101, and a condensing lens 15 in the optical axis direction. And a voice coil 16 to be driven.

The first half mirror 14 is provided for the recording optical system 1.
3 and the laser light incident from the beam splitter 22, and the laser light incident from the condenser lens 15 is separated into the recording optical system 13 and the beam splitter 22.

The condenser lens 15 includes the first half mirror 1
The light emitted from 4 is focused on the glass master 101. As the condenser lens 15, a lens close to the limit NA = 1 obtained in a dry system is used.

A latent image is formed on the photoresist formed on the surface of the glass master 101 by the irradiated laser beam condensed by the condenser lens 15. As described later, a portion between the exposed portions of the photoresist where the latent image is formed becomes a pre-groove.

In this embodiment, control information is recorded on the glass master 101 by wobbling formed in a pre-groove.

This wobbling is a so-called CD-R,
Alternatively, in a recordable optical disk such as a so-called MD, the pre-group for recording data is formed by slightly meandering.

The address in the disk and the information for controlling the rotation of the disk are recorded by the wobbling of the pre-groove, and the data is recorded by determining the position from the information.

For example, in a so-called CD-R, a pre-group is FM-modulated at ± 1 kHz with a carrier of 22.05 kHz at the time of rotation at a standard speed, and the pre-groove is wobbled to form a so-called ATIP (absolu).
te time in pregroove) data is recorded.

The ATIP data provides motor control information based on a carrier frequency and time-code information based on carrier frequency modulation. The time code information increases almost monotonically across the disc.

That is, the ATIP data is recorded as wobble in the track radial direction by FM modulation using a carrier frequency of 22.05 kHz. The digital modulation method is a biphase mark, and a biphase violation is synchronized. Data bit rate is 3
It is 150 bits / sec, the frame length is 42 bits, and the frame frequency is 75 Hz.

The ATIP data is composed of a frame having a format as shown in FIG. That is, ATI
The P frame is composed of 4 bits of sync, 8 bits of minutes, 8 bits of seconds, 8 bits of frames, and 14 bits of CRC (cyclic redun).
dancy check) consists of 42 bits with a remainder.

The ATIP data is encoded by the encoder 6 shown in FIG.
Encoded with 0. The encoder 60 has a 44.
A signal source 61 for generating a 1 kHz clock;
1 / 44.1 kHz clock divided by 2 to 22.05
a first frequency divider 62 using a carrier of 1 kHz and a signal source 6
1 44.1kHz clock divided by 7 to 6300H
and a second frequency divider 63 that uses the z bi-phase clock.

The encoder 60 has a second frequency divider 63
Input based on the bi-phase clock from the
A bi-phase modulator 64 for bi-phase modulating the IP data, and a bi-phase signal from the bi-phase modulator 64 based on the carrier from the first frequency divider 62
(Frequency modulation) and an FM modulator 65 that outputs the modulated data to a recording system on a disk.

Information recorded on a CD-R by wobbling can be read as a push-pull signal.

When the FM modulation of the read signal is demodulated,
The clock becomes a 6.3 kHz biphase signal, and when demodulated, a 42-bit group of signals becomes 1/1
Obtained every 75 seconds.

The disk is controlled to a CLV (constant line velocity) using a clock of 6.3 kHz, and a signal every 1/75 second is an address in the disk. Data recording is performed.

The amount of wobbling of the pre-group is very small, at most about 2% with respect to the track pitch, in order to reduce the influence on the recorded signal.

Since the wobbling signal is obtained by push-pull, the crosstalk of the recording signal of the track itself is canceled at the time of push-pull calculation. Although the frequency of the recording signal and the frequency of the wobbling signal are far apart, crosstalk is still a serious problem in practice.

If the track pitch is reduced while keeping the laser spot diameter the same in order to increase the disk capacity,
Further, crosstalk increases. The difficulty in reading information due to the wobbling of the pre-groove is an obstacle to increasing the density of the disk.

Also in the present embodiment, ATIP information encoded by such an encoder 60 can be used. The encoder 60 is provided in, for example, the encoding unit 50 of a cutting device.

In the present embodiment, a signal encoded using the spread spectrum technique is recorded by wobbling. Spread spectrum is a transmission scheme in which a signal occupies a wider bandwidth than the minimum amount required to send information. The bandwidth is extended by data-independent encoding, and the receiver uses reception synchronized with the encoding to recover the data after reducing the bandwidth.

[0051] Spread spectrum was developed in the 1950's as a military technology for communicating in the presence of radio interference. Spread spectrum reduces interference to the signal,
It has the characteristic that the energy density of a signal can be reduced and the distance and time delay between a transmitter and a receiver can be measured.

That is, according to the spread spectrum, the bandwidth of a signal is extended to a wide band by encoding, so that noise, interference, interference, and the like during transmission are reduced by being spread to a low level in the wide band during demodulation.

According to the spread spectrum, since the signal is extended to a wide band, the energy density per frequency can be reduced, and the distance and the time delay can be measured using the synchronous communication between the transmitter and the receiver. it can.

Recently, spread spectrum is also applied to a CDMA (code division multiple access) type mobile phone in which a common band is shared by many users by using division based on coding. ing.

In this embodiment, low-frequency information recorded by pre-group wobbling is converted into a wide-band signal by spread spectrum, and, unlike conventional wobbling, spread to a position close to the frequency of the recording signal. Wobble the pregroup over a wide band.

In the present embodiment, a signal expanded over a wide band by the spread spectrum technique is recorded by wobbling. Although the crosstalk to the recording signal and the crosstalk from the recording signal are large because the bands overlap, the crosstalk from the recording signal can be effectively eliminated when reading the wobbling signal due to the nature of the above-described spread spectrum technique. Therefore, the amount of wobble can be made smaller than before, and crosstalk to a recording signal can be made smaller.

For example, considering application to a so-called CD-R, a 6.3 kHz bi-phase modulated signal is converted to 1
The pregroove can be wobbled and recorded in a 6.3 MHz band by spreading with a gain of 000 times.

At present, in a so-called CD-R drive, control of a constant line velocity (CLV) is controlled by 6.
This is performed based on a clock of a 3 kHz biphase signal.

Therefore, when such signal processing is performed, both an address signal for writing and a signal for controlling the rotation of the disk CLV are recorded by spread spectrum.

It has been found that reading is somewhat easier if the information obtained by wobbling is not modulated and the address information is embedded but is used only at a single frequency for the clock for CLV.

In this case, a method is conceivable in which only the information for rotation control is recorded in a pre-group wobbled at a single frequency, and only the address information is recorded by wobbling by spread spectrum.

For demodulation of a spread spectrum signal, a pseudo random signal for demodulation needs to be synchronized with the spread signal. To facilitate this synchronization, a method of providing a clock bit for synchronization may be considered.

As shown in FIG. 4A, the synchronization clock bits include lands (lanes) between grooves (grooves) 71.
d) Land pre-pi (land pre-pi) formed at 72
t) 75 is available. Land pre-pit 7
5 is used in a so-called DVD-R.

In the figure, a pit 73 is formed along a groove 71 by a focused spot 74 where a laser beam is focused.
The signal is recorded by forming.

As shown in FIG. 4B, the clock bits for synchronization include fine clock marks (fi
ne clock mark) 76 can be used. The fine clock mark 76 is used in a so-called DVD + RW.

By using the land pre-pits 75 and the fine clock marks 76, clock bits can be reliably detected even at a narrow track pitch.

In FIG. 1, the voice coil 16 moves the condenser lens 15 in the optical axis direction.

The cutting device has a first He-Ne laser 21, a beam splitter 22, and a first light detector 23 for detecting light from the beam splitter 22.

The laser light emitted from the first He—Ne laser 21 is applied to the beam splitter 22 and the first half mirror 14.
Then, the light is obliquely incident on the glass master 101 via the condenser lens 15. The beam splitter 22 includes the condensing lens 14
And the first H obtained via the first half mirror 14
The return light of the e-Ne laser 21 from the glass master 101 is separated to the first light detection unit 23.

The first light detecting section 23 includes a glass master 101
In the focal direction is detected by a change in the position of the return light from the glass master 101.

The cutting device performs the glass master 10 based on the amount of light detected by the first photodiode 23.
It has a defect detection unit 24 for detecting one defect and a focus servo 25 for driving and controlling the condenser lens 16 in the optical axis direction based on the position of the return light.

The defect detecting section 24 detects a defect existing on the glass master 101 based on the amount of light returning from the glass master 101 detected by the first light detecting section 23.

The focus servo 25 keeps the distance between the condenser lens 15 and the glass master 101 constant based on the change in the focal direction of the glass master 101 detected by the first light detection unit 23. The voice coil 16 is controlled.

The cutting device includes a spindle motor 31 for rotating and driving the glass master 101, a rotary servo 32 for controlling the rotation of the spindle motor 31, a feed table 33 for supporting the glass master 101 movably in the radial direction, And a feed motor 34 for moving the table 33.

The spindle motor 31 is used for the glass master 10
1 is driven to rotate at a predetermined speed. For example, a DC brushless motor can be used.

The rotation servo 32 controls the spindle motor 31 so that the rotation of the glass master 101 becomes, for example, CAV.

The glass master 101 supported by the feed base 33 is moved in the radial direction by a feed motor 34 in accordance with a signal recording position on the glass master 101. The position of the glass master 101 is fixed and the glass master 10 is fixed.
The cutting device can be configured such that the recording optical system 13, the condenser lens 15, and the like are moved in accordance with the signal recording position on the device 1.

The cutting device comprises a second He-Ne laser 35, a second half mirror 36, and a second He-Ne laser 35 reflected by the second half mirror 36.
A second photodiode 37 for detecting the light amount of the laser beam from the camera, and a pitch error detection unit 39 for detecting a pitch error based on the light amount detected by the second photodiode 37.

The fluctuation of the feed base 33 in the radial direction of the glass master 101 is detected by the second photodetector 37 in the second He−
The laser light of the Ne laser 35 and the feeder 3 of this laser light
3 is detected by the interference of the returning light. These lights are combined by the second half mirror 36.

The pitch error detector 39 detects a pitch error at a signal recording position on the glass master 101 based on the change in the position of the feed base 33 detected by the second light detector 37.

The cutting device includes an optical modulator servo 41 for controlling the modulation of the laser beam in the optical modulator 12, a shutter control unit 42 for controlling the shutter, an input unit 43 for inputting a user operation, and the cutting unit 43. A system control unit 44 for controlling the entire apparatus.

The optical modulator servo 41 controls the signal level so that the optical modulator 12 performs predetermined modulation. For example, with respect to the EO modulator, the operating point changes due to a change in temperature, so that a temperature servo is applied.

The shutter control section 42 controls a shutter (not shown) for performing a shutter operation on the laser beam.

The input unit 43 uses, for example, a keyboard, and the user inputs data to this device.

The system control unit 44 includes, for example, a CPU, an R
It is composed of a microcontroller having an OM, a RAM and the like, and controls each part of the device.

The cutting apparatus has an encoding unit 50 for encoding input data by spread spectrum.

The encoding section 50 modulates and modulates the baseband signal to be transmitted by multiplying it by a wideband pseudo-random signal when performing phase or frequency modulation using a spread spectrum technique. A signal modulated by spread spectrum is demodulated by multiplying the same pseudo-random signal during demodulation.

As shown in FIG. 5, encoding section 50 includes a channel encoding section 51 for channel encoding input data,
A pseudo-random pattern generating unit 53 for generating a pseudo-random pattern, and a modulation unit for spreading the spectrum of the channel data encoded by the channel encoding unit 51 based on the pseudo-random pattern generated by the pseudo-random pattern generating unit 53 52.

As a modulation method in the modulation section 52, for example, phase-shift keying (PSK)
And frequency-shift keying (FSKF)
Can be used. In the present embodiment, PSK is preferable because the phase coherence between the transmission signal and the reception signal can be maintained for a relatively long period as compared with the reciprocal of the transmission signal.

The channel data spread in spectrum by modulation section 52 is output from encoding section 50 to channel 91. The channel data receives interference when transmitting the channel 71. In the present embodiment, the channel data is recorded as wobbling due to the pre-groove of the disk, and is subject to interference due to crosstalk between recording tracks.

The bandwidth of the channel data is much larger than the rate of the input data, and is less susceptible to interference. Also, since the channel data is spread over a wide bandwidth, it can be transmitted with low power. That is, the wobbling amplitude can be reduced.

FIG. 5 also shows the configuration of a decoding unit 80 that decodes the spectrum-spread channel data encoded by the cutting device and sent to the channel 91. The decoding unit 80 is provided in, for example, a reproducing device that reproduces a disk obtained by duplicating the glass master disk 101 created by the cutting machine.

The decoding unit 80 includes a pseudo-random pattern generation unit 83 for generating a pseudo-random pattern, and a spread spectrum channel transmitted from the channel 91 based on the pseudo-random pattern generated by the pseudo-random pattern generation unit 83. A demodulation unit 81 for demodulating data;
And a channel decoding unit 82 for decoding channel data demodulated from the spread spectrum.

In order for the demodulation unit 81 to demodulate the channel data sent from the encoding unit 50, the pseudo random pattern generated by the pseudo random pattern generation unit 83 is synchronized with the pseudo random pattern included in the channel pattern. It is necessary to do. As described above, prior to demodulation of channel data, synchronization is established by wobbling with a single frequency or the timing of a clock bit such as a land pre-pit or a fine clock mark, and then demodulation is started. Can be.

Next, a process of preparing a glass master using the above-described cutting apparatus will be described with reference to FIG.

In the first step S11, the glass substrate 101a used for the master optical disc 101 is cleaned. As shown in FIG. 7A, the glass substrate 101a has a disk shape whose surface is sufficiently polished.

In step S12, as shown in FIG. 7B, a photoresist is applied to the surface of the glass substrate 101a by using a spin coater called a spinner to form a photoresist layer 101b. The glass substrate 101a having the photo-resist layer 101b formed on the surface in this manner is used as the glass master 101.

In step S13, as shown in FIG. 7C, the glass master 101
Laser cutting is performed to record a signal by exposing the photoresist layer 101b to laser light. The laser light is focused on the photoresist layer 101b by the focusing lens 15.

In step S14, step S1
In step 3, the exposed glass master 101 is developed.
The photoresist layer 101b of the glass master 101 includes
As shown in FIG. 7D, pits and grooves are formed by development.

In step S15, as shown in FIG. 7E, a conductive film 121 is formed on the developed photoresist layer 101b. For the conductive film 121, for example, silver or nickel is used.

In step S6, nickel electroforming is performed using the glass master 101 having the conductive film 121 formed on the photoresist layer 101b as a cathode and a nickel chip as an anode. Thereby, on the glass master 101,
As shown in FIG. 7F, thick nickel plating is applied to form a nickel layer 122. Glass master 101
When the nickel layer 122 is peeled off from the substrate, a father serving as a nickel stamper 125 is obtained.

Next, the duplication of a disk based on the optical disk master 101 will be described with reference to FIG.

The disc is prepared by using the nickel stamper 125 obtained from the master optical disc 101 in step S
21 and 2P (photo poly) in step S22.
mer) It is reproduced by the construction method.

In the injection molding in step S21, nickel
By injecting the heat-melted resin into a mold with the stamper 125 attached, the transmission layer 1
11a.

In the 2P method in step S22, the nickel stamper 125 attached to the mold and the base plate 1
This is a method of forming a transmission layer 111a of the optical disc 111 by filling a resin 124 which cures by ultraviolet irradiation between the layers 23 and curing the resin 124 by ultraviolet irradiation.

In step S23, step S1
A recording layer 111b is formed of a recording material on the surface of the transmission layer 111a of the optical disc 111 on which the pits and grooves have been transferred from the nickel stamper 125 by the injection molding of 1 or the 2P method of step S12.

In step S24, step S1
3 above the recording layer 111b formed on the recording layer 111b.
The reflection film 111c for reflecting the light transmitted through is formed of metal.

In step S25, step S1
The protective film 111d made of resin is formed on the reflective film 111c formed in Step 4.

According to such steps, the master optical disc 1
01, the optical disk 111 can be duplicated. On the copied optical disk 111, a control signal that has been spectrum-spread by wobbling in a pre-groove is recorded. As described above, address information and clock information are recorded as control signals.

Although the description of the present invention has been made on the assumption that an optical disk is recorded in a group represented by a so-called CD-R, similarly, tracks at the time of forming a disk, that is, grooves or lands are wobbled to write data. If it is a system that records the address etc. for
The present invention can be applied to a magnetic disk.

[0111]

As described above, according to the present invention, control information is recorded by using spread spectrum.

Therefore, according to the present invention, the signal due to the wobbling of the pre-groove can be demodulated even in an environment where the crosstalk of the recording signal is large, and the operation of a recording type disk drive such as a so-called CD-R can be further stabilized. .

Further, according to the present invention, it is possible to further reduce the track pitch of a recording type disc to increase the recording density.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a schematic configuration of a cutting device.

FIG. 2 is a diagram showing a structure of a so-called ATIP data frame.

FIG. 3 is a block diagram illustrating a structure of an encoder that encodes so-called ATIP data.

FIG. 4 is a diagram showing clock bits.

FIG. 5 is a diagram illustrating signal processing of spread spectrum.

FIG. 6 is a flowchart showing a process of manufacturing an optical disc master.

FIG. 7 is a diagram illustrating a manufacturing process of the optical disc master.

FIG. 8 is a diagram illustrating a copying process of an optical disc.

FIG. 9 is a diagram showing a structure of a so-called CD-R.

FIG. 10 is a diagram showing a so-called CD-R pregroove structure.

FIG. 11 is a diagram illustrating a so-called CD-R PCM and PMA.

[Explanation of symbols]

11 He-Cd laser, 12 optical modulator, 13 recording optical system, 15 condenser lens, 25 focus servo,
31 spindle motor, 32 rotary servo, 33 feed base, 34 feed motor, 35 He-Ne laser, 3
8 feed motor servo, 101 glass master

Claims (11)

[Claims] 1. A recording method for forming a recording track on a disc master for producing a disc-shaped recording medium on which a recording track on which a signal is recorded is formed, wherein control information is provided by wobbling along the recording track. A recording method, comprising a recording step of recording, wherein the recording step records control information by spectrum spreading. 2. The recording method according to claim 1, wherein the recording track is a guide groove. 3. The recording method according to claim 1, wherein the control information is address information and / or clock information. 4. The recording method according to claim 3, wherein the clock information is a reference signal for rotating a recording medium at a constant linear speed along a recording track. 5. The recording method according to claim 1, wherein said control information is address information, and said recording step records clock information by wobbling along a recording track. 6. The recording method according to claim 1, wherein in the recording step, a synchronization signal of the control information is recorded along a recording track. 7. The recording method according to claim 6, wherein the synchronization signal is recorded by wobbling or land / pre-pit. 8. A disk manufacturing apparatus for manufacturing a disk master for duplicating a disk-shaped recording medium having a guide groove for recording a signal, wherein guide groove forming means for forming a guide groove on a surface of the disk master. A disc manufacturing apparatus, wherein the guide groove forming means records control information spectrum-spread by wobbling along the guide groove. 9. The disk manufacturing apparatus according to claim 8, wherein the control information is address information and / or clock information. 10. A disk-shaped recording medium on which a signal is recorded along a recording track, wherein control information spread spectrum by wobbling is recorded along the recording track. 11. The control information includes address information and / or
11. The recording medium according to claim 10, wherein the recording medium is clock information.