JPH0676366A - Disk for evaluation and exposure system for master disk for evaluation - Google Patents

Abstract

PURPOSE:To easily judge an ATIP synchronizing pattern and a connecting position of incremental writings by visual sensor and to easily produce a disk for evaluation. CONSTITUTION:A groove B with wide width is provided in a prescribed interval in the middle of grooves in order to easily and accurately judge the synchronizing pattern and the incremental writing by an observation using an optical microscope, etc. Otherwise, a discontinuous gap G with a broken groove is provided in a prescribed interval in the middle of grooves.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an evaluation disk for evaluating an ATIP synchronization rule and a master exposure system for producing the evaluation disk.

[0002]

2. Description of the Related Art Conventionally, when developing a CD writer, it is necessary to confirm whether or not the following (1) ATIP synchronization rule and (2) general combining rule are satisfied. The well-known Orange Book, which advocated the content of this rule, defines the following. (1) ATIP synchronization rule A permissible error between ATIP synchronization and subcode synchronization is ± 2EFM frames over the entire surface of the write-once disc. However, the ATIP sync position is immediately after the sync pattern, and the subcode sync position is the start position of the sync pattern. (2) General combining rule In incremental writing, that is, in writing divided into several times, the combining position is the writing start position and the end position,
It is set to 26 EFM frames after the start of subcode synchronization, and its allowable error is ± 1 EFM frame.

In order to satisfy this rule, the position of the ATIP sync pattern and the position of the subcode sync pattern may be detected. Therefore, the positions of the ATIP synchronization pattern and the subcode synchronization pattern are confirmed by signal processing such as ATIP demodulation and EFM decoding.

[0004]

Thus, when developing a CD writer, the positions of the ATIP sync pattern and the subcode sync pattern are confirmed by signal processing. In this case, there is a drawback that the detection of the ATIP synchronization pattern and the subcode synchronization pattern is delayed and cannot be confirmed accurately. Further, although ATIP demodulation can be obtained from a tracking error signal obtained by reproducing recorded information on a write-once disc, the tracking error signal waveform after writing pits may be deformed, which makes decoding difficult. That is, the ATIP demodulation after writing the pits has a drawback of lacking accuracy. In addition, there is a drawback that the physical positions of the ATIP sync pattern and the subcode sync pattern cannot be visually determined easily.

The present invention is intended to solve such a conventional problem, and makes it possible to easily visually judge the ATIP synchronization pattern and the write connection position of the increment and to easily manufacture the evaluation disk. The purpose of the present invention is to provide a disc and an evaluation disc master exposure system.

[0006]

In order to achieve the above object, the evaluation disk according to claim 1 has an AT in the middle of the groove.
This is a configuration in which a synchronization pattern visual determination unit for physically and visually determining the position of the IP synchronization pattern is provided.

The evaluation disk according to a second aspect of the present invention has a configuration in which an increment writing visual determination unit for visually determining the joining position of increment writing is provided in the middle of the groove.

In the evaluation disk according to the third aspect of the present invention, a groove having a large width is provided in a predetermined section in the middle of the groove as the synchronizing pattern visual judging section and the increment writing visual judging section.

In the disk for evaluation of claim 4, the sync pattern visual judgment portion and the incremental writing visual judgment portion are provided with discontinuous gaps in which grooves are interrupted at predetermined intervals in the middle of the groove.

According to the evaluation disk of claim 5, the evaluation disk of claim 3 is used.
The groove having a large width in is provided in the ATIP synchronization rule allowable error range.

According to a sixth aspect of the present invention, there is provided an evaluation disc master exposure system for producing an evaluation disc having a groove having a large width in a predetermined section in the middle of the groove, wherein an amount of light provided in the ATIP encoder and the disc master exposure device. AT that detects a synchronization pattern with the adjustment A / O driver
The IP sync pattern detection unit, the timing pulse generation unit that generates a pulse after the detection of the sync pattern, and the voltage switching unit that outputs a high voltage to the light amount adjustment A / O driver during the pulse width are provided. A thick groove is formed to indicate the position of or the combined position of increment writing.

According to a seventh aspect of the present invention, there is provided an evaluation disk master exposure system for producing an evaluation disk having a discontinuous gap in which a groove is discontinued in a predetermined section in the middle of the groove. Between the laser light on / off A / O driver in the device,
An ATIP sync pattern detection unit for detecting a sync pattern, and A / A for laser light on / off after the sync pattern is detected.
A timing pulse generating unit for generating a pulse for setting the O driver to OFF is provided, and a discontinuous gap having a discontinuous groove is formed in the middle of the groove indicating the position of the ATIP synchronization pattern or the combined position of the increment write. .

[0013]

With such a structure, the evaluation disk of the present invention according to any one of claims 1 to 5 can be used as a synchronization pattern visual judgment unit and an increment writing visual judgment unit as a groove having a wide width in a predetermined section in the middle of the groove. A discontinuous gap in which the groove is interrupted is provided in a predetermined section in the middle of the groove, whereby the ATIP synchronization pattern and the combined position of increment writing can be visually and easily determined.

Further, the evaluation disk master exposure system according to the sixth and seventh aspects detects a synchronization pattern and generates a pulse of a predetermined length, and a high voltage is applied to the light quantity adjusting A / O driver during this pulse width. Since the data is output, it is possible to easily manufacture an evaluation disk having a groove having a large width in a predetermined section. Also, during the pulse width, the A / O for turning the laser light on / off
Since the driver is set off, it is possible to easily manufacture an evaluation disk having a discontinuous gap in which a groove is discontinued in a predetermined section in the groove.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the evaluation disk and the evaluation disk master exposure system of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing the arrangement of an evaluation disk master exposure system according to the first embodiment. The first embodiment corresponds to claim 6. In FIG. 1, this example has an ATIP encoder 2 and an optical disc master exposure device 20. The ATIP encoder 2 is provided with a well-known ATIP synchronization pattern generator 4, a bi-phase modulator 6, and an FM modulator 8. The optical disk master exposure device 20 includes a well-known analog A / O driver 21, a sweep oscillator 22, and a digital A / O driver.
O driver 23, analog A / O 24 for adjusting light quantity,
Wobble analog A / O 25 and laser light on (O
N) / off (OFF) digital A / O 26. Further, the FM modulator 8 in the ATIP encoder 2
And the wobble amplitude voltage adjustment unit 10 connected between the optical disc master exposure device 20 and the sweep oscillator 22 in the optical disc master exposure device 20.
have. In addition, the FM modulator 8 in the ATIP encoder 2 and the analog A /
The ATIP synchronization pattern detection unit 1 is connected to the O driver 21.
2, the timing pulse generation unit 14, and the voltage switching unit 16 are connected to each other.

The operation of the configuration of the first embodiment will be described. Here, the ATIP synchronization pattern detection unit 1
2, timing pulse generation unit 14, voltage switching unit 16
Thus, a process of forming a groove having a large width in a specific section in the middle of the groove indicating the position of the ATIP synchronization pattern or the combined position of the incremental writing is performed on the disk (not shown). First, the ATIP synchronization pattern detector 1
In 2, the wobble signal from the FM modulator 8 in the ATIP encoder 2 is demodulated, and when a sync pattern is detected, a sync pattern detection signal is output. The timing pulse generator 14 generates a pulse of a predetermined length after a predetermined time when the sync pattern detection signal is input. Voltage switching unit 1
In 6, the voltage value at which a groove having a normal width is formed is output when the pulse is at the low (L) level. And
At the time of high (H) level, a high voltage for forming a wide groove is output. This voltage value is set to a value that provides a wide groove in a predetermined section in the middle of the groove within the allowable error range of the ATIP synchronization rule or the combination rule of increment writing.

FIG. 2 is a block diagram showing the arrangement of an evaluation disk master exposure system according to the second embodiment. The second embodiment corresponds to claim 7. In FIG. 2, this example has an ATIP encoder 2 and an optical disc master exposure device 20. ATIP encoder 2
Is provided with a well-known ATIP synchronization pattern generator 4, a bi-phase modulator 6, and an FM modulator 8. The optical disk master exposure device 20 includes a well-known analog A / O driver 21, a sweep oscillator 22, and a digital A / O driver.
O driver 23, analog A / O 24 for adjusting light quantity,
Wobble analog A / O25 and laser light ON / OF
It has a digital A / O 26 for F. Also, ATI
A wobble amplitude voltage adjuster 10 is provided between the FM modulator 8 in the P encoder 2 and the sweep oscillator 22 in the optical disk master exposure device 20. Furthermore, AT
Between the FM modulator 8 in the IP encoder 2 and the digital A / O driver 23 in the optical disc master exposure device 20,
The TIP synchronization pattern detection unit 12 and the timing pulse generation unit 14 are provided so as to be connected to each other.

The operation of the configuration of the second embodiment will be described. Wobble amplitude voltage adjustment unit 10, ATIP
Synchronization pattern detection unit 12, timing pulse generation unit 14
AT to the evaluation disc master (not shown)
A gap, that is, an unexposed portion is provided in the middle of the groove indicating the position of the IP synchronization pattern or the combined position of the incremental writing. First, the ATIP sync pattern detector 12 demodulates the wobble signal from the ATIP encoder 2 and outputs a sync pattern detection signal when a sync pattern is detected. Timing pulse generator 14
Then, when the synchronization pattern detection signal is input, a pulse having a predetermined length is generated after a predetermined time. The digital A / O driver 23 receives this pulse and turns on / off the laser light.
ON / OFF the digital A / O 26 for use. For example, when the pulse from the timing pulse generator 14 is at a high (H) level, if the digital A / O 26 for laser light ON / OFF is turned off (OFF) through the digital A / O driver 23, the groove is interrupted and a gap is formed. It

Next, description will be given of an evaluation disk corresponding to claims 1, 3 and 5 created by the evaluation disk master exposure system of the first embodiment. FIG. 5 is a diagram showing a surface state of an evaluation disk provided with a groove having a wide width. In FIG. 5, this example has a groove P having a normal width and a groove B having a large width. The thick groove B has the ATIP synchronization position as the start position. Thus, (1) ATIP in the Orange Book previously shown
It corresponds to the synchronization rule. A normal writing operation is performed on this evaluation disk, and when observed with an optical microscope or the like, the sync pattern start position of the sub-code shows a groove B with a thick width.
If it is within ± 2EFM frames from the start position of, the ATIP synchronization rule of Orange Book is satisfied. Furthermore, the setting of the time length of the pulse width from the timing pulse generating unit 14 in FIG. 1 is changed so that the range of the ATIP synchronization ± 2EFM frames (total 4EFM frames) is set to the groove B having a large width as shown in FIG. In this case, it is sufficient to determine whether or not there is a groove B having a large width immediately after the pattern having a normal width, and the confirmation work by observation with an optical microscope or the like can be performed more quickly.

Next, a description will be given of an evaluation disk corresponding to claims 2 and 4, which is produced by the evaluation disk master exposure system of the second embodiment. FIG. 4 is a view showing a surface state of an evaluation disk having a groove provided with a gap.
In FIG. 4, a groove G is provided in the groove R. This gap has a start position at a combined position of increment writing, that is, a position 26 EFM frames after the subcode synchronization position. This corresponds to (2) general combining rule in the Orange Book described above. Incremental writing, that is, writing operation divided into several times, is performed on this evaluation disk, and observed with an optical microscope. The starting point (or ending point) of each writing portion is ± 2 EFM from the starting position of the gap G.
If the frame is within the range (that is, the ATIP synchronization rule is satisfied) and the overlap between the adjacent write portions is within ± 1EFM frame, it means that the general combining rule is satisfied. Become.

[0021]

As is apparent from the above description, in the evaluation disc and the evaluation disc master exposure system of the present invention, in claim 1, the position of the ATIP synchronization pattern is visually judged during the groove. Since a synchronization pattern visual judgment unit is provided for checking whether or not the ATIP synchronization rule in Orange Book is satisfied when pit writing is performed, it is possible to easily and easily by observing with an optical microscope. It has the effect of being accurate. According to the present invention, since the increment writing visual judgment unit for visually judging the joining position of the increment writing is provided in the groove, the general joining rule in the Orange Book when performing the increment writing is satisfied. This has the effect that the work of checking whether or not it can be easily and accurately performed by observing with an optical microscope. In the third aspect, since the groove having a large width is provided in the predetermined section, the ATI
The ATIP synchronization pattern position can be easily determined without damaging the P information. In claim 4,
Since a discontinuous gap in which the groove is interrupted is provided in a predetermined section in the middle of the groove, there is an effect that the ATIP synchronization pattern position can be clearly determined. Claim 5
Then, since a groove having a large width is provided in the ATIP synchronization rule permissible error range in a predetermined section in the middle of the groove,
This has the effect of making it possible to instantly determine whether or not this rule is satisfied. According to the sixth aspect of the present invention, the synchronization pattern is detected, a pulse of a predetermined length is generated, and a high voltage is output to the light amount adjusting A / O driver during this pulse width. The effect is that an evaluation disk provided with a groove having a width can be easily manufactured. In claim 7, the laser light is turned on / on during the pulse width.
Since the off A / O driver is set to off, there is an effect that it is possible to easily manufacture an evaluation disk having a discontinuous gap in which a groove is discontinued in a predetermined section in the middle of the groove.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an evaluation disk master exposure system according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of an evaluation disk master disc exposure system according to a second embodiment.

FIG. 3 is a diagram showing a surface state of an evaluation disk in which a groove having a large width is provided in the groove in the example.

FIG. 4 is a diagram showing a surface state of an evaluation disk having a gap in the groove in the example.

FIG. 5 is a diagram showing a surface state of an evaluation disk in which a groove having a large width is provided in the middle of the groove in the example.

[Explanation of symbols]

 2 ATIP encoder 4 ATIP sync pattern generator 6 Bi-phase modulator 8 FM modulator 10 Wobble amplitude voltage adjuster 12 ATIP sync pattern detector 14 Timing pulse generator 16 Voltage switcher 20 Optical disc master exposure machine 21 Analog A / O driver 22 Sweep Oscillator 23 Digital A / O Driver 24 Light Amount Adjustment Analog A / O 25 Wobble Analog A / O 26 Laser Light ON / OFF Digital A / O

Claims (7)

[Claims] 1. An evaluation disk, comprising a sync pattern visual judgment section for visually judging the position of an ATIP sync pattern in the middle of a groove. 2. An evaluation disk, comprising an increment writing visual determination unit for visually determining the joining position of increment writing in the middle of the groove. 3. An evaluation disk, wherein a groove having a large width is provided in a predetermined section in the middle of the groove as the synchronizing pattern visual judging section of claim 1 and the incremental writing visual judging section of claim 2. . 4. The synchronization pattern visual judgment unit according to claim 1 and the increment writing visual judgment unit according to claim 2 are characterized in that a discontinuous gap in which the groove is interrupted is provided in a predetermined section in the middle of the groove. Evaluation disk to be used. 5. A groove having a large width according to claim 3,
An evaluation disk characterized by being provided within an ATIP synchronization rule allowable error range. 6. An evaluation disk master exposure system for producing the evaluation disk according to claim 3, comprising an ATIP encoder and a light amount adjusting A / O driver provided in the disk master exposure apparatus. An ATIP sync pattern detecting section for detecting a sync pattern in the meantime, a timing pulse generating section for generating a pulse after the sync pattern is detected, and the light quantity adjusting A / O between the pulse widths.
A disc master exposure system for evaluation, wherein a driver is provided with a voltage switching unit for outputting a high voltage, and a thick groove is formed to indicate a position of an ATIP synchronization pattern or a combination position of increment writing. 7. An evaluation disk master exposure system for producing the evaluation disk according to claim 4, comprising:
An ATIP sync pattern detector for detecting a sync pattern between the TIP encoder and the laser light on / off A / O driver in the disc master exposure device, and the laser light on / off A after detecting the sync pattern. And a timing pulse generator for generating a pulse for setting the / O driver off, and forming a discontinuous gap in which the groove is discontinued in the middle of the groove indicating the position of the ATIP synchronization pattern or the combined position of the increment write. Characteristic disk master exposure system for evaluation.