JPH09251643A - Optical master disk producing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical master disk producing method capable of producing an optical disk on which information of large capacity are stored by writing the information on tracks with a simple operation without using complex facilities with high accuracy and efficiently. SOLUTION: Information to be applied from a format generator 15 are recorded in a groove part and a land part while movingly controlling a glass master disk 7 within the range of the twice width of a track width in the radial direction on spiral tracks having a prescribed pitch which are formed on the glass master disk 7 by the format generator 15 while by allowing an optical modulator 17 to be controlled according to recording information and in which the groove part and the land part are continuously repeated. Then, the information of large capacity are recorded on the spiral tracks of the glass master disk 7 with high accuracy by shortening an exposure time while controlling the moving of the glass master disk 7, the moving of a laser spot and the emitting of the laser spot corresponding to the information with high accuracy based on the oscillation frequency of a common oscillator in a simple process.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of producing an optical disc master from a glass master coated with a recording material.

[0002]

2. Description of the Related Art An optical disk has a large recording density and a large capacity, is excellent in random access, and is recorded and reproduced in a non-contact state. Therefore, it is not affected by dust and surface stains. Occupies the mainstream position.

The current storage capacity of an optical disk is 650M.
Although it is about B, the capacity is further increased, and in addition to the increase in the number of tracks, the land and groove which records the information recorded in either the land or the groove of the conventional track in both the land and the groove. Groove recording (L / G recording) is also performed, and an optical disc having a storage capacity of 4.7 GB has been proposed. As described above, when the storage capacity of the optical disc is increased, the exposure time for recording information is increased and the efficiency of producing the optical disc master is reduced.

To solve this problem, Japanese Patent Laid-Open No.
In Japanese Patent Publication No. 29993, a laser beam emitted from a recording laser is split by a beam splitting unit, and a plurality of masters are irradiated as beams modulated according to signals corresponding to the masters, thereby simultaneously recording a plurality of masters. A recording device is disclosed.

However, in the master recording apparatus according to the disclosure, the structure becomes complicated, there is a problem in manufacturing cost, and the synchronization control of each part of the apparatus becomes complicated, and it is difficult to improve the recording accuracy of the master.

[0006]

As described above, in order to produce an optical disk master with high accuracy, it is necessary to use a complicated device and repeat operations in complicated steps.
The production efficiency of the optical disc master is sacrificed.

The present invention has been made in view of the present situation of producing such an optical disk master as described above, and an object thereof is to transfer information to a track by a simple operation without using complicated equipment. It is an object of the present invention to provide a method for creating a high-disk master that enables accurate and efficient writing to create a high-disk master that stores a large amount of information.

[0008]

In order to achieve the above-mentioned object, the invention according to claim 1 comprises a groove portion and a land portion, a track on which information is recorded is formed in a spiral shape, and the information is A method for producing an optical disc master in which an optical disc master recorded on the groove portion and the land portion is made from a glass master disc coated with a recording material, and the track is aligned with an incident position of a laser beam from a laser light source. As described above, a driving step of moving the glass master disk in the radial direction and rotating the glass master disk, and a deflection step of performing a deflection operation of holding the incident position of the laser light on the center line of the target track, By the driving step and the deflecting step, the incident position is set on the center line of the target track, and the glass master disk rotates. In a state where the laser light source is ON-OFF controlled corresponding to the information, and in the driving step, the optical disc master is moved in the radial direction within a range of twice the width of the track, And a control step of causing the recording of the information in the modulation step.

Similarly, in order to achieve the above object, the invention according to claim 2 is characterized in that, in the invention according to claim 1, the information of the track is formed in a CAV format. .

Similarly, in order to achieve the above object, the invention according to claim 3 is the invention according to claim 1, characterized in that the information of the track is formed in a CLV format. .

[0011] Similarly, in order to achieve the above-mentioned object, the invention according to claim 4 comprises a groove portion and a land portion, and a track on which information is recorded is formed in a spiral shape, and the information is recorded in the groove portion and the land portion. A method for producing an optical disc master in which an optical disc master recorded on the land portion is made from a glass master coated with a recording material,
The driving step of moving the glass master disk in the radial direction and rotating the glass master disk so that the track is aligned with the incident position of the laser light from the laser light source, and the laser light incident position, In the state where the incident position is set on the center line of the target track by the deflection step of performing the deflection operation of holding on the center line of the track, the driving step and the deflection step, and the glass master is rotated, In the modulation step of ON / OFF controlling the laser light source in accordance with the information, and in the driving step, the information of the information in the modulation step is changed while moving the optical disc master in the radial direction within the range of the track width. And a control step for performing recording.

[0012] Similarly, in order to achieve the above object, the invention of claim 5 is characterized in that, in the invention of claim 4, the information of the track is formed in a CAV format. .

Similarly, to achieve the above object, the invention according to claim 6 is characterized in that, in the invention according to claim 4, the information of the track is formed in a CLV format. .

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION

[First Embodiment] A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a block diagram showing the configuration of a master recording apparatus used for carrying out the present embodiment, FIG. 2 is a block diagram showing the configuration of the deflector controller of FIG. 1, and FIG. 3 is created in the present embodiment. It is an explanatory view of an optical disc master.

In this embodiment, a glass master 7 coated with a photosensitive photoresist and recording information is mounted on a turntable 8 and fixed to the turntable 8 by vacuum suction. A pulse generator 2 is controlled by the MPU 1 that controls the overall operation, and a basic clock FPG and a track obtained by subjecting the output signal of the common crystal oscillator to signal processing such as frequency division, respectively, from the pulse generator 2. Pulse TP,
Command pulses TPG and SPG are output.

Here, the command pulse SPG is a pulse for laterally feeding the glass master disk 7, the command pulse TPG is a pulse for rotating the glass master disk 7, and 4000 pulses are output per rotation, and the track pulse TP is a track. One pulse is output for every 4000 pulses of the command pulse TPG, and the basic clock FPG is a clock for operating the format generator 15 in synchronization with the command pulses TPG and SPG.

By the way, in this embodiment, a spiral track in which grooves and lands are alternately continuous is formed in the photosensitive photoresist of the glass master 7. Then, the command pulse SP from the pulse generator 2
When G is output, the lateral feed motor controller 3 is activated by this command pulse SPG, and the lateral feed motor controller 3 outputs a control signal F1.
1, the lateral feed motor 5 rotates to drive the lateral feed stage 6 and the glass master 7 is moved in the radial direction.

When the command pulse TPG is output from the pulse generator, the control signal F is output from the spindle motor controller 11 by the command pulse TPG.
2 is output, the spindle motor 10 is rotated by the control signal F2, and the glass master 7 is PLL with the shaft center as the center.
Rotate by control.

On the other hand, laser light is emitted from the laser oscillator 18, and this laser light is reflected by the mirror 20 and input to the optical modulator 17. And the pulse generator 2
When the basic clock FPG and the track pulse TP are output from the format generator 15, the format generator 15 outputs the control signal F3 corresponding to the recording information. The control signal F3 drives the modulator driver 16 and the modulator driver. 16, the optical modulator 17 performs ON-OFF operation of the laser light output in accordance with the recorded information.

When the pulse generator 2 outputs the track pulse TP and the command pulse TPG, the deflector controller 12 outputs a control signal F4. The control signal F4 causes the deflector driver 13 to output the optical deflector. 14 to drive the glass master 7 through the objective lens 15.
The deflection control of the laser beam is performed so that the spot of the laser light incident on is irradiated to the center position of the track of the photosensitive photoresist.

In the present embodiment, the deflector controller 12 is constructed as shown in FIG. 2, and the command pulse TPG which generates 4000 pulses for one rotation of the turntable 8 is divided by the frequency divider 21. Track pulse T
A count signal that is counted by the counter 22 that is reset by P and obtained according to the count value is converted into an analog signal by the DA converter 23, amplified by the amplifier 24, and input to the adder / subtractor 26 via the switch circuit 25. Then, the control signal is calculated by subtraction from the reference signal Vref that sets the neutral position signal.

The deflector driver 13 controls the optical deflector 14 so that the laser spot takes a neutral position when the control signal F4 is 2.5V, and when the control signal F4 is larger than 2.5V, the laser spot is outside. On the side, the control signal is 2.5V
When it becomes smaller, it moves to the inner circumference side.

Therefore, in the present embodiment, when the deflector controller 12 is reset by the track pulse TP and the recording of information for a new track is started, the control signal becomes 2. When the glass master 7 is rotated. The laser spot gradually decreases from 5 V, and the laser spot is controlled to be located at the center position of the spiral track. When the glass master 7 makes one rotation, the laser spot moves 0.8 μm when the track pitch is 1.6 μm. .

In this way, in the present embodiment, the deflector driver 1 is controlled by the deflector controller 12.
The optical deflector 14 is driven by 3 and the laser spot is always positioned so as to follow the center position of the spiral track.

In this case, in the present embodiment, the reference signal V
The neutral point can be changed by changing ref in synchronization with the preformat signal generated for each sector.

In the present embodiment, when the glass master disk 7 is driven by CAV to record information, the glass master disk 7 is rotated at a constant angular velocity and laterally fed at a constant speed in accordance with the CAV driving to be performed. Command pulse TPG, SPG for
Is output. For example, when the rotation speed is 300 rpm and the track pitch is 1.6 μm, the command pulse TPG is 20 K.
A pulse having a constant frequency of 1 KHz is output as the Hz and the command pulse SPG.

When the deflector controller 12 controls the position of the laser spot on the center line of the track, the format generator 15 outputs a control signal corresponding to the recording information. By the driven optical modulator 17, the glass master 7
Then, the laser light is incident as a laser spot corresponding to the recorded information via the objective lens 15. The recorded information corresponding to the laser spot is exposed on the groove portion and the land portion of the track of the photoresistor, respectively.
For example, the preformatted bit information for allocating an address to the entire surface of the glass master 7 is exposed on the groove portion to form a latent image.

In the present embodiment, when writing this information, the transverse feed motor 5 is driven by the command pulse SPG, and the transverse feed stage 6 controls the movement of the glass master 7 within a range twice the width of the track. In this state, the above-mentioned information recording is performed by the optical modulator 17 while shortening the exposure time.

Further, in this embodiment, the glass master disk 7 is CL
When V driving is performed to record information, command pulses TPG and SPG are output so that the linear velocity of the glass master 7 becomes constant at the incident point of the laser spot on the glass master 7. For example, the laser spot has a linear velocity of 1.2 mm / sec from the point of the radius of 20 mm of the glass master 7 to the outer periphery.
When the CLV drive is performed at a track pitch of 1.6 μm, the rotation of the glass master 7 is 573 rpm (TPG; 38.2K).
Hz), the lateral feed of the glass master 7 is 15.3 μm / sec.
The command pulse TSG, S from the format generator 15 is set so as to start at (SPG; 1.91 KHz).
PG is output.

Then, the format generator 15 issues a command pulse TP for each revolution of the glass master disk 7.
G and SPG are reviewed, command pulses TPG and SPG are output at the first time so that the linear velocity is constant at the position of the radius of 20.016 mm, and the second time the laser spot has a radius of 20.0032 mm. The command pulses TPG and SPG are output so that the linear velocity becomes constant at the position, and control is performed so that the frequency is gradually lowered.

Under such control, as in the case of the CAV driving, the deflector controller 12 controls the position of the laser spot on the center line of the track, and when the format generator 15 outputs a control signal, The modulator driver 16 is driven, and the optical modulator 17 causes the laser light to enter the glass master 7 through the objective lens 15 as a laser spot corresponding to the recorded information. The information corresponding to the laser spot is exposed to the groove portion and the land portion of the track of the photoresist, respectively. For example, the preformatted bit information for allocating the address to the entire surface of the glass master 7 is exposed to the groove portion and is hidden. An image is formed.

At the time of writing this information, the lateral feed motor 5 is driven by the command pulse SPG, and the glass master 7 is controlled by the lateral feed stage 6 to move within a range twice the width of the track. , By the optical modulator 17,
Recording of information is performed by shortening the exposure time.

In this way, according to the present embodiment,
As shown in FIG. 3, by the operation of the optical modulator 17 controlled by the format generator 15 in accordance with the recording information, the pitch d in which the groove portion 30 and the land portion 31 are continuously repeated on the glass master disk 7. Is 0.8
The information given from the format generator 15 is L / G-recorded on the μm spiral track 32 under the movement control in the range of twice the track width of the glass master disk 7 in the radial direction.

Therefore, according to the present embodiment, the movement of the glass master disk 7, the movement of the laser spot, and the emission of the laser spot corresponding to the information can be performed with high accuracy by a simple process based on the oscillation frequency of the common oscillator. While controlling to
It becomes possible to accurately record a large amount of information in the groove portion and the land portion of the spiral track of the glass master 7 while shortening the exposure time.

[Second Embodiment] A second embodiment of the present invention will be described. In the present embodiment, when the glass master 7 is CAV-driven or CLV-driven to write the recording information on the spiral track of the glass master 7, the lateral feed motor 5 is driven by the command pulse SPG, Information is recorded by the optical modulator 17 while the glass master 7 is controlled to move within the width of the track by the feed stage 6.

The other parts of the method of producing the optical disk master according to the present embodiment are the same as those in the first embodiment already described, and therefore a duplicate description will not be given.

As described above, according to the present embodiment, a simple process is performed based on the oscillation frequency of the common oscillator.
While accurately controlling the movement of the glass master 7, the movement of the laser spot, and the emission of the laser spot corresponding to the information, a large amount of information can be accurately recorded in the groove and land of the spiral track of the glass master 7. It becomes possible to record well.

[0038]

According to the first aspect of the invention, in the driving step, the glass master is rotated while being moved in the radial direction so as to match the track position with the incident position of the laser light from the laser light source, and is deflected. In the step, the incident position of the laser beam is held and controlled on the center line of the target track, and in the control step, the optical disc master is moved in the radial direction within a range twice the width of the track with respect to the driving step. Since the laser beam is ON-OFF controlled corresponding to the recording information in the modulation step, an optical disc master in which a large amount of information is recorded with high accuracy in the groove portion and the land portion of the spiral track, It is possible to efficiently and easily create the exposure film by a simple process.

According to the invention described in claim 2, in addition to the effect obtained by the invention described in claim 1, since the glass disk is moved in the radial direction at a constant velocity and rotated at a constant angular velocity, the synchronous control is performed. Is easily performed, and an optical disc master can be produced advantageously in terms of access time and seek time.

According to the invention of claim 3, in addition to the effect obtained by the invention of claim 1, since the linear velocity of the glass disk at the incident position of the laser light is controlled to be constant, recording of information is performed. It is possible to increase the density.

According to the invention described in claim 4, in the driving step, the glass master is rotated while being moved in the radial direction so that the track position coincides with the incident position of the laser light from the laser light source, and in the deflection step. , The incident position of the laser beam is controlled to be held on the center line of the target track, and in the control step, the optical disc master is moved in the radial direction within the track width range while the modulation step is performed with respect to the drive step. Since the laser light is controlled to be turned on and off according to the recorded information, a large amount of information is recorded on the groove portion and the land portion of the spiral track with high accuracy, and the optical disc master can be efficiently processed by a simple process. Can be created in.

According to the invention described in claim 5, in addition to the effect obtained by the invention described in claim 4, since the glass disk is moved in the radial direction at a constant velocity and rotated at a constant angular velocity, the synchronous control is performed. Is easily performed, and an optical disc master can be produced advantageously in terms of access time and seek time.

According to the invention described in claim 6, in addition to the effect obtained in the invention described in claim 4, since the linear velocity of the glass disk at the incident position of the laser light is controlled to be constant, the recording of information is performed. It is possible to increase the density.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a master recording device used for carrying out a first embodiment of the present invention.

2 is a block diagram showing the configuration of the deflector controller shown in FIG. 1. FIG.

FIG. 3 is an explanatory diagram of an optical disc master created in the present embodiment.

[Explanation of symbols]

 1 Microprocessor 2 Pulse Generator 3 Traverse Motor Controller 5 Traverse Motor 6 Traverse Stage 7 Glass Master 12 Deflector Controller 13 Deflector Driver 14 Optical Deflector 15 Format Generator 16 Modulator Driver 17 Optical Modulator 18 Laser Oscillator

Claims (6)

[Claims] 1. A track having a groove portion and a land portion, on which information is recorded, is formed in a spiral shape, and a recording material is coated on an optical disc master in which the information is recorded on the groove portion and the land portion. A method for producing an optical disc master that is made from a glass master disc, wherein the glass master disc is moved in the radial direction and the glass master disc is rotated so that the track is aligned with the incident position of the laser light from the laser light source. Driving step, a deflection step of performing a deflection operation for holding the incident position of the laser light on the center line of the target track, and the incident position on the center line of the target track by the driving step and the deflection step. Is set and the glass master is rotated, the laser light source is turned on and off according to the information. A modulation step, and a control step, in the driving step, for recording the information in the modulation step while moving the optical disc master in a range of twice the width of the track in the radial direction. A method for producing an optical disc master characterized by. 2. The method for producing an optical disc master according to claim 1, wherein the track information is formed in a CAV format. 3. The method for producing an optical disc master according to claim 1, wherein the track information is formed in a CLV format. 4. A track composed of a groove portion and a land portion, on which information is recorded, is formed in a spiral shape, and a recording material is coated on an optical disc master in which the information is recorded on the groove portion and the land portion. A method for producing an optical disc master that is made from a glass master disc, wherein the glass master disc is moved in the radial direction and the glass master disc is rotated so that the track is aligned with the incident position of the laser light from the laser light source. Driving step, a deflection step of performing a deflection operation for holding the incident position of the laser light on the center line of the target track, and the incident position on the center line of the target track by the driving step and the deflection step. Is set and the glass master is rotated, the laser light source is turned on and off according to the information. A modulation step for controlling the optical disc master and a control step for recording the information in the modulation step while moving the optical disc master in a radial direction within a range of the track width in the driving step. How to make an optical disc master. 5. The method for producing an optical disc master according to claim 4, wherein the track information is formed in a CAV format. 6. The method for producing an optical disc master according to claim 4, wherein the track information is formed in a CLV format.