JP2002150753A - Optical information recording medium and stamper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical information recording medium capable of displaying its capacity at maximum while using conventional recording and reproducing devices and capable of increasing the recording capacity without violating the standards on the medium itself. SOLUTION: In the case of 78 min-59 sec-73 frames, ATIP is not changed even when one frame is advanced, and when two frames are advanced, the frame information becomes 78 min-59 sec-74 frames. In further advance of two frames, the frame information is reset, carry is generated and second information also is carried to 79 min.00 sec.00 frame. Thus frame information is advanced by one frame in each advance of two real frames. Consequently information can be written/read out twice as many.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disc,
The present invention relates to an optical information recording device represented by R, CD-RW, DVD-R, DVD-RW, etc., a stamper for manufacturing them, and a method for manufacturing this stamper.

[0002]

2. Description of the Related Art Optical information recording devices such as optical disks and magneto-optical disks have been widely used as data recording media and audio information recording media in recent years.
CD-R, CD-RW, DVD-R, DVD-RW, and the like have been used. In these optical information recording devices, information such as fine pit marks or the like attached to the surface of a disk-shaped recording medium or changes in the properties of a film provided on the surface of a disk-shaped recording medium due to magnetism are used as information. Information is recorded by using optical means.

Some of the meanings of the terms relating to the optical information recording apparatus of this type are described in JIS X6261.
"130mm write-once optical disc cartridge", JIS62
71, "130 mm rewritable optical disk cartridge", and the terms described therein are used in the present specification unless otherwise specified.

In these optical information recording devices, meandering grooves and lands are alternately provided in a spiral shape, and information is usually written on the grooves. The grooves and lands are used for position control for causing the photodetector to travel along the zone in which information is written, that is, for position detection for performing tracking.
That is, the intensity of the reflected light differs depending on the position of the groove or the land where the light is irradiated, and the position control device receives the signal, controls the position of the photodetector, and writes the information. Control is performed so that light is accurately applied to the current position.

[0005] Of these optical information recording devices, C
In the DR, CD-RW, and the like, a standard called Orange Book is defined, and according to the standard, the inner circumference of a disc-shaped optical information recording medium (hereinafter, may be simply referred to as a “disk”). From the PCA (Powe
r calibration area), PMA (Program memoryar)
ea) area, a lead-in area, a program area, and a lead-out area are to be provided. The PCA is an area for performing test recording by a recording drive, and the PMA is an area for recording a memory usage state of an optical information recording medium.

[0006] The lead-in area is an area for recording control information to be given to a recording device, a recording / reproducing device or the like when recording information on the optical information recording medium or reading information from the optical information recording medium. . The program area is used by a user to write and read information, and is an area that can be used by the user. The lead-out area is provided outside the program area, and is used to restore the tracking when the tracking of the photodetector is shifted and runs off the program area.

Meanwhile, a meandering pre-groove is formed on a CD-R or a CD-RW. The pre-groove is wobbled in a meandering manner based on a signal obtained by synthesizing a reference signal having a predetermined frequency and pre-format information. The recording device demodulates the amount of light reflected from the pregroove, and performs recording / reproduction based on the obtained preformat information. This pre-groove is a PCA provided in each area of CD-R and CD-RW.
Area, PMA area, lead-in area, program area,
It is formed continuously in the lead-out area.

It is standardized that the PCA area has a length of about 22 seconds and 40 frames, and the PMA area has a length of about 13 seconds and 25 frames. While ensuring this length, set the CD so that the lead-in area start radius is within the standard.
-R and CD-RW are formed.

The start radius of the lead-in area and the program area start radius are determined at predetermined positions, and the lead-in area start time is determined by a manufacturer identification code (M-code).
However, since it is a code (T-code) indicating the recording method (write strategy), the manufacturer cannot practically arbitrarily change the code. The program area start time is also determined by the standard. The size of the lead-out area is also specified by the standard to be 1 minute 30 seconds or more in terms of recording time.

In such an optical information recording medium,
It is possible to increase the recording density of information by reducing the track pitch as much as possible and decreasing the linear velocity (m / s) used for recording and reproducing information. Recording is preferable. Also, if the program area can be made as large as possible, it is possible to record a large amount of information on the same optical information recording medium.

As a technique corresponding to the former, Japanese Patent Application Laid-Open No. Hei 10-222874 discloses a technique of reducing a track pitch in a program area and increasing a recording linear density (corresponding to a linear velocity). ing.
Generally, the resolution of a photodetector is determined by the wavelength of light used and the numerical aperture (NA) of the optical system. Therefore, in this technique, the wavelength and the numerical aperture (λ = 78) which are generally used are used.
Wavelength shorter than 0 nm, NA = 0.45, and high NA (λ = 635-68)
(5 nm, NA = 0.6) and increasing the resolution to decrease the track pitch and increase the recording linear density (corresponding to the linear velocity), thereby increasing the recording capacity.

[0012]

However, a disk having a simply reduced track pitch or linear velocity has a short wavelength,
When recording is performed using a recording apparatus using a high NA and a small spot size, λ = 780 nm, which is usually used,
There is a problem that reading cannot be performed by a reproducing apparatus having a photodetector with NA = 0.45. That is, there is no compatibility with those conventionally used, and a dedicated playback device must be used. In addition, since the information in the lead-in area cannot be read, it is impossible to even identify the type of the disc.

In addition, this method has another problem that comes from the Orange Book standard. That is, when simply reducing the track pitch, it is difficult to keep both the lead-in start radius and the program start radius within the standard.

That is, the disc after recording is reproduced without any problem by the current CD player or CD-ROM drive, and the disc before or after recording is reproduced by the current CD-R.
In order to record with a / RW writer without any problem, since the lead-in start time information represents the manufacturer information and the write strategy information, the lead-in start time information cannot be changed practically, and the time from the start of the lead-in to the start of the program. Cannot be changed because it is defined by the standard. Therefore, if the track pitch is set to a value of 1.5 μm or less in order to increase the recording information density, the lead-in start radius position or the program start radius position will be out of specification.

When trying to record a non-standard disc, the lead-in information may not be reproduced or may not be recorded due to a reading error, a recording error may occur, or data may not be recorded normally. Even if a non-standard disc can be luckily recorded, data may not be read properly or the data may not be read at all when reproducing the non-standard recorded disc.

In the invention described in Japanese Patent Application Laid-Open No. Hei 10-222874, by keeping the track pitch and recording linear density of the lead-in area unchanged, even if a conventional reproducing apparatus is used, the type of disc can be reduced. Make it possible to identify. However, even if the disc type can be identified by this method, information written in a program area by a recording device having a short-wavelength, optical NA pickup cannot be read by a conventional recording device. Is no different.

In the invention described in JP-A-10-222874, as shown in the embodiment,
In the PCA area, the PMA area, the program area, and the lead-out area, the track pitch and the recording linear density are the same, and these are changed only in the lead-in area. This is because the PCA area is an area for trial recording with a recording drive, and the PMA is an area for recording the memory usage status of the optical information recording medium, and therefore, recording and reproduction are performed under the same conditions as the program area. It is based on the notion that it must be done and is inevitable for the invention.

As described above, increasing the recording capacity by performing recording with a recording apparatus using a short wavelength, a high NA, and a small spot size cannot be used by a conventional recording / reproducing apparatus. This causes a problem. Therefore, other possible methods, which are not known, are methods in which the track pitch is reduced as much as possible and the linear velocity is reduced as much as possible within the allowable limit of the conventional recording and reproducing apparatus.

However, even when such other methods are employed, there is a problem that the standard of the disk is not satisfied. That is, according to the Orange Book standard, there is a problem that the maximum length of the program area is limited to 79:59:74. That is, usually, the start of the program area is 00 minutes 00 seconds 00
According to the Orange Book standard, the start time of the lead-out area (corresponding to the last frame of the program area: last possible start time of the lead-out area) is 79:59:74 at maximum. Limited.

This is based on ATIP (Absolute Time in Pre
-groove) has a two-digit time display portion, and the tens place is because information can be written in the lead-in area as a lead-out start time at a maximum of only seven. Therefore, the program area is limited to the maximum of 00:00:00 frame to 79:59:74 frame, that is, 79:59:75 frame, and the capacity of the program area is further increased.
It cannot be lengthened.

Even if data is recorded in a lead-out area that is not normally used for writing,
Since the record recorded in the TIP has exceeded the lead-out area start time, it is impossible to know where the recordable end position of the disc is, and the data cannot be reliably recorded to the end or the data of the disc itself. If the drive attempts to record outside the disk area, the drive or the disk, or both, may be destroyed.

The present invention has been made in view of such circumstances, and uses a conventional recording apparatus and reproducing apparatus to maximize its capabilities, and furthermore, a standard imposed on an optical information recording medium. An object of the present invention is to provide an optical information recording medium having an increased recording capacity, a stamper for manufacturing the same, and a method for manufacturing the stamper without violating the requirements.

[0023]

According to a first aspect of the present invention, there is provided a disk-shaped optical information recording medium for recording and reproducing information by a light beam tracked along a meandering groove or land. In the one having a PCA area, a PMA area, a lead-in area, a program area, and a lead-out area in order from the inner circumference to the outer circumference, time code information recorded in advance is used for each of a plurality of real frames. An optical information recording medium characterized by being increased by one frame (Claim 1)
It is.

According to the standard, the data structure of one frame of ATIP is as shown in FIG. 1, and the minute, second, and frame are each represented by 7 bits (1 bit out of 8 bits is fixed data). . Then, as shown in FIG.
Each time the frame advances, the frame data is incremented by 1, and 7
It increases by 1 second in 5 frames and increases by 1 minute in 60 seconds.
ATIP corresponding to the program area is 00 min 00 sec 00
Starts with a frame and ends with a maximum of 79:59:74. Therefore, the storage capacity is (80 × 60 × 75) frames.

In this means, the correspondence between ATIP data and real frames is changed. That is, in the prior art, the ATIP data is increased by one frame each time one real frame is advanced.
The data of P is increased by one frame. Therefore, in relation to the data recorded in ATIP, (8
(0 × 60 × 75) × N frames of data can be recorded. Therefore, the recording capacity can be increased even when there are restrictions due to ATIP.

The number of N may be two or more, but it is currently preferably two in relation to a possible physical recording density. That is, there is actually a lower limit of the track pitch depending on the wavelength of the conventionally used optical pickup and the NA of the objective lens. Further, there is a lower limit on the linear velocity control of a conventionally used writer or player, because the minimum recording mark may be too short or the CLV control may not be applied.

Specifically, the track pitch is 1.1 μm
The lower limit is about 0.9 m / sec. Converted from these, the current recordable capacity is 150 minutes, 1.33 GB
Degree is the limit. It is preferably 120 minutes or less and 1.05 GB or less, and more preferably 99 minutes or less and 866 MB is good in terms of reliability of data writing / reproducing. Considering these, at present, there is no advantage even if N is 3 or more, and it is preferable to set N to 2.

The "prerecorded time code information" is time code information recorded at the time of manufacturing an optical information recording medium, and is usually recorded by wobbling a groove. I do. In particular, the meandering cycle is changed according to the time record information.
This information is used only at the time of writing the information. At the same time as the writing of the information, the address of the frame is used as a part of the information recorded in the frame of the program area as “the time code information recorded in advance. , And the reading is controlled based on the information written in the frame. Therefore, even if a plurality of frames having the same ATIP are generated by incrementing the “pre-recorded time code information” for each of a plurality of frames, the reading control is not disabled.

[0029] A second means for solving the above-mentioned problem is as follows.
A light having a meandering groove or land, a time record being defined according to the meandering cycle of the meandering groove or land, and a light beam for upward recording / reproducing by a light beam tracked along the meandering groove or land. An optical information recording medium according to claim 2, wherein said time record is increased by one frame for every plural frames.

This means is equivalent to the first means, and has the same operational effects as the first means.

A third means for solving the above-mentioned problem is:
In the first means or the second means, which has a PCA area, a PMA area, a lead-in area, a program area, and a lead-out area in order from the inner circumference to the outer circumference, a PCA area, a PMA area The track pitch in the program area is narrower than the track pitch in the lead-in area (claim 3).

In this means, the track pitches of the PCA area, the PMA area, and the lead-in area are set to the levels used in the conventional recording apparatus and reproducing apparatus, and the track pitch of the program area is Make it narrower than the track pitch. Of course, the track pitch in this case must be a pitch at which a tracking error does not occur more than an allowable value even when applied to a conventional recording apparatus and reproducing apparatus.

When the track pitch is reduced over the entire surface of the disk, the above-described problem occurs. However, in this means, the track pitch of the PCA area, the PMA area, and the lead-in area is reduced by the conventional recording apparatus and reproducing apparatus. The above-mentioned problem does not occur because the used amount is used.

According to this means, it is possible to maximize the capacity of the conventional recording apparatus and reproducing apparatus while using it, and to increase the recording capacity without violating the standard imposed on the disc. Optical information recording medium. Further, since the first means is adopted,
Even if the recording capacity is increased, the time record does not stop corresponding thereto.

In the present means, the PCA area, the PMA area, and the lead-in area located in the inner peripheral portion have a relatively large track pitch as compared with the program area. Easy to enter the meandering groove pattern on the surface (easy to inject). Therefore, transfer is performed reliably. This occurs because the resin is injected from the inner periphery. In addition, since the releasability of the inner peripheral portion is particularly good also at the time of peeling, a cloud is hardly generated, the inner diameter hole shape can be processed finely, and a substrate with less eccentricity can be manufactured.

A fourth means for solving the above problem is as follows.
In the first means or the second means, which has a PCA area, a PMA area, a lead-in area, a program area, and a lead-out area in order from the inner circumference to the outer circumference, a PCA area, a PMA area The track pitch of the program area and the lead-out area is narrower than the track pitch of the lead-in area (claim 4).

In this means, in addition to the program area, the track pitch of the lead-out area is also set to the PCA area,
The track pitch in the PMA area and the lead-in area is narrower. By reducing the track pitch of the lead-out area, the program area can be expanded accordingly, and the storage capacity can be further increased.

A fifth means for solving the above problem is as follows.
The third means or the fourth means, wherein the linear velocity of the PCA area is the same as the linear velocity of the program area (Claim 5).

The PCA area is an area for trial recording.
Since the PMA area is an area for recording the memory usage status of the optical information recording medium, in these areas, tracking can be reliably performed, reading and writing can be performed with a sufficient margin, and calibration can be performed. It is desirable that this can be performed reliably. In this means,
Since the linear velocities of the PCA area and the program area are the same, the circumferential size of marks recorded on both areas can be the same, and writing and reading can be performed under the same conditions, so that calibration can be performed more accurately. Can be done.

A sixth means for solving the above-mentioned problem is:
Any one of the first means to the third means, wherein a PCA area, a PMA area,
In one having a lead-in area, a program area, and a lead-out area, the linear velocity of the program area is made slower than the linear velocity of the PCA area, the PMA area, and the lead-in area. It is.

In this means, the linear velocities of the PCA area, the PMA area, and the lead-in area are set to the levels used in the conventional recording apparatus and reproducing apparatus, and the linear velocities of the program area and the lead-out area are set to these values. I try to make it slower.

When the linear velocity is reduced over the entire surface of the disk, the above-described problem occurs.
Since the linear velocities of the CA area, the PMA area, and the lead-in area are set to the levels used in the conventional recording apparatus and reproducing apparatus, for the same reason as described in the second means,
The problem described above does not occur.

According to this means, it is possible to maximize the capacity of the conventional recording apparatus and reproducing apparatus while using the same, and to increase the recording capacity without violating the standard imposed on the disc. Optical information recording medium.

A seventh means for solving the above-mentioned problem is as follows.
Any one of the first means to the third means, wherein a PCA area, a PMA area,
In a device having a lead-in area, a program area, and a lead-out area, the linear velocity in the program area and the lead-out area is lower than the linear velocity in the PCA area, the PMA area, and the lead-in area ( Claim 7).

In this means, in addition to the program area, the linear velocity in the lead-out area is lower than the linear velocity in the PCA area, PMA area, and lead-in area. By slowing down the track pitch of the lead-out area, the program area can be expanded correspondingly, so that the storage capacity can be further increased.

Eighth means for solving the above-mentioned problem is:
A disc-shaped optical information recording medium for recording / reproducing information by a light beam tracked along a meandering groove or land, wherein the diameter of the optical information recording medium is 1
An optical information recording medium having a length of 20 mm and a program recording time of 90 to 120 minutes.

The optical system of the recording apparatus and the reproducing apparatus currently used has a wavelength of 780 nm and NA = 0.45. According to experiments by the inventors, it has been found that when this apparatus is used, the minimum track that can be read and written stably is used. The pitch is about 1.1 μm and the slowest linear velocity is about 0.9 μm. However, in this means, the track pitch is set to about 1.17 μ with a certain margin.
m and the linear velocity are set to about 1.0 μm. From now on, the diameter is 1
When the standard of the optical information recording medium of 20 mm is considered, the maximum value of the recording time is 120 minutes. Therefore, in this means, the maximum value of the program recording time is set to 120 minutes.
Further, since the conventional maximum value of the program storage time does not exceed 90 minutes even when various methods are used, in this means, the minimum value of the program recording time is limited to 90 minutes. Such an optical information recording medium can be realized by the first to seventh means.

A ninth means for solving the above-mentioned problem is:
A stamper having a convex portion corresponding to the concave portion formed on the optical information recording medium of any of the first to eighth means and a concave portion corresponding to the convex portion (Claim 9).

According to this means, the first to seventh means are used.
The optical information storage medium, which is a means, can be mass-produced at low cost by injection molding or the like.

[0050]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description of the embodiments and examples, the wavelength 78 that is currently most frequently used is described.
0 nm, a recording device using a light emitting and receiving device having a numerical aperture of about 0.45, a reproduction device may be described as an example, but the present invention is not used only for such a recording device, the reproduction device, wavelength It can also be used for recording devices and reproducing devices having different numerical apertures and thus different resolutions, and can also be used when a standard conforming to the specifications of such recording devices and reproducing devices is established. .

FIG. 1 is a diagram showing the configuration of ATIP, which is time code information recorded in a meandering groove in advance. The first four bits are used as a sync signal for synchronization, and the following eight bits are used as BCD signals (two digits each) indicating minutes, seconds, and frames. However, the maximum value of the second is 59 and the maximum value of the frame is 74.
Then, the minute value is 0 to 7 in the program area.
9 is to be taken. The last 14 bits are C
Used as an RC check bit. This ATI
The P information is usually recorded as a groove wobble signal at the time of manufacturing an optical information recording medium (more precisely, at the time of manufacturing a stamper).

FIG. 2 shows a change in the conventional ATIP information every time one frame advances. That is, 1
Each time the frame progresses, the frame information is incremented by one. If it is 78:59:73 at the beginning, if it advances one frame, it becomes 78:59:74, and if it goes further one frame, the frame information is reset to cause a carry, and at the same time, the second information also carries. Thus, 79 minutes 00 seconds 00 frames are obtained.

FIG. 3 shows a change in ATIP information every time one frame advances in an example of the embodiment of the present invention. In this embodiment, the frame information is incremented by one every two frames.

At the beginning, when the frame is 78:59:73, the ATIP does not change even if the frame is advanced by one frame, the frame becomes 78:59:74 when the frame is advanced by two frames, and the frame information is reset when the frame is advanced by two frames. As a result, the second information also carries a digit, resulting in a 79:00:00 frame.

In this way, every time two real frames advance, the frame information advances by one frame. Naturally, the time (position) between the actual frame and the ATIP frame
Information does not correspond one-to-one as in the related art.

However, at the time of writing information, time (position) information of each frame (hereinafter, sometimes simply referred to as “position information”) is written at the head of each frame together with the information to be written, and at a predetermined time. The area where information is written (frame range) is recorded by writing the start and end values of the written position information of each frame in the lead-in area.

In reading information, A
The time (position) information of the frame recorded in the TIP is not used, and the start and end values of the position information of each frame written in the lead-in area and the position information of each frame written first in each frame , A predetermined frame is recognized and information in the frame is read. Therefore, even if the real frame and the time (position) information of the ATIP frame do not correspond one-to-one as in the related art, no problem occurs.

In this way, it is possible to record twice as much time code data in the same program area as the conventional one. In addition, since the ATIP defined by the Orange Book standard is used as it is, ATIP decoding can be performed with a conventional CD-R or CD-RW writer, so that there is no problem in terms of compatibility. Naturally, it is also possible to increment one frame every time the same frame is repeated three or four frames.

FIG. 4 is a diagram showing an arrangement of recording areas of a CD-R and a CD-RW according to an embodiment of the present invention and a distribution of a track pitch or a linear velocity in each area. In FIG. 4, (a) shows the arrangement of the recording areas, where a non-recording area without a groove from the center, a PCA area, a PMA area, a lead-in area, a program area, a lead-out area, and a non-recording without a groove The order is the area. Each of these areas is manufactured so as to satisfy the Orange Book standards described in the section of the prior art.

In a conventional recording apparatus and reproducing apparatus having a photodetector having a wavelength of 780 nm and NA = 0.45, the standard of the track pitch is 1.5 μm to 1.7 μm. Therefore, in the present embodiment, the track pitches of the PCA area, the PMA area, and the lead-in area are set to values in this range. Conventionally, when the peak-to-peak value (push-pull signal) of a signal obtained when the photodetector crosses a track is equal to or larger than a predetermined ratio of the magnitude of a signal obtained from a mirror portion having no groove. Tracking is stably performed by the recording device and the reproducing device.

In a conventional recording apparatus and reproducing apparatus having a photodetector having a wavelength of 780 nm and NA = 0.45, the standard of linear velocity is 1.2 m / s. Therefore, in this means, the linear velocities of the PCA area, the PMA area, and the lead-in area are set to values in this range.

(B)-(e) are diagrams showing the distribution of track pitch or linear velocity corresponding to each area. (B) corresponds to a conventional CD-R, and has a PCA area, PMA
In the area, the lead-in area, the program area, and the lead-out area, both the track pitch and the linear velocity are constant.

(C) corresponds to the CD-R according to the first embodiment of the present invention, and the track pitch and linear velocity are almost the same in the PCA area, the PMA area, and the lead-in area as in the conventional example. (Track pitch is 1.5 ~ 1.7μm, linear velocity is
1.2m / s). On the other hand, in the program area and the lead-out area, the track pitch,
At least one of the linear velocities is smaller than those in the PCA area and the PMA area (the track pitch is 1.1 μm or more and less than 1.5 μm, and the linear velocity is 0.90 m / s to less than 1.2 m / s).

Since the track pitch and the linear velocity in the PCA area, the PMA area, and the lead-in area are the same as those in the related art, the lead-in start radius, the program start radius, and the time from the lead-in start to the program start are within the standard. Can be stored. On the other hand, in the program area, at least one of the track pitch and the linear velocity is smaller than in the conventional example, so that the recording capacity of the program area can be increased.

Further, in this embodiment, at least one of the track pitch and the linear velocity is smaller in the lead-out area than in the conventional example. Since the area occupied by the out area can be reduced and that part can be used as a program area, the recording capacity of the program area can be increased. Of course, the present invention also includes the case where the track pitch and the linear velocity of the lead-out area are the same as those of the PCA area, the PMA area, and the lead-in area.

According to the results of the experiments by the present inventors, the wavelength 78
In order to obtain a sufficient push-pull signal and a reproduction signal with sufficient characteristics even with a conventional recording device or reproducing device using an optical system having a numerical aperture of about 0 nm and a numerical aperture of about 0.45, the track pitch must be set to 1.1 μm or more. It was found that the speed had to be set to 0.90 m / s or more. Therefore, in the embodiment shown here and in the following embodiments, the narrowed track pitch and the reduced linear velocity are also in this range. Therefore, an optical information recording medium capable of recording and reproducing can be obtained simply by using a conventionally used recording device and reproducing device.

(D) corresponds to the CD-R according to the second embodiment of the present invention, and is different from (c) in that at least one of the track pitch and the linear velocity in the lead-out area is different. , In the program area. As a result, the area occupied by the lead-out area can be further reduced as long as the recording time standard of the lead-out area is satisfied, and that part can be used as a program area, thereby increasing the recording capacity of the program area. Can be done.

(E) corresponds to the CD-R shown for reference, in which at least one of the track pitch and the linear velocity is smaller in the lead-out area than in the other areas. . In this example,
The area occupied by the lead-out area can be reduced as long as the recording time standard of the lead-out area is satisfied, and that part can be used as a program area, so that the recording capacity of the program area can be increased. .

When a master of such a disc is manufactured, processing corresponding to grooves and prepits is performed by a laser cutting machine or the like, and the processing is performed by moving a table for fixing the master to these processing machines. There are a table moving type and a pickup moving type that performs processing by moving a processing tool such as a laser. When changing the track pitch, the pickup moving method has a faster response and better tracking accuracy, but the table moving method is superior in terms of the processing accuracy of the entire disc, so use both as appropriate. Is preferred.

When the linear velocity of the optical information recording medium or the master of such a disk is reduced, the length of the formed pits or one cycle of the meandering amplitude of the wobbled pre-groove in the direction of rotation of the medium. It is also possible to reduce the length of time spent on Therefore, when forming a master disk of a disk having a wobble-shaped pre-groove, the linear velocity can be reduced by shortening the length of the meandering amplitude consumed in one cycle.

Hereinafter, a method of manufacturing a stamper according to an embodiment of the present invention will be described with reference to FIG. FIG.
1 is a substrate, 1a is a master, 2 is a photoresist layer, 3 is a Ni layer, 3a is a first mold, 4 is a resin liquid, 4a
Is the second mold, 5 is the base (glass disk), 6 is the Ni layer,
6a is a third mold.

As a substrate material, a soda-lime glass is processed into a donut-shaped disk to obtain a substrate 1. Thereafter, the substrate surface is precisely polished to a surface roughness of Ra = 1 nm or less. After the cleaning, a primer and a photoresist 2 are spin-coated on the substrate surface in this order. When prebaked, a photoresist layer 2 having a thickness of about 200 nm is formed on each substrate 1 (1).

Next, using a laser cutting device,
The photoresist 2 on the substrate 1 is exposed. The pattern of the exposure is a pattern corresponding to the grooves and prepits of the optical information recording medium according to the present invention.

The exposed resist 2 on the substrate 1 is developed with an inorganic alkali developer. The resist surface is spin-cleaned and then post-baked. Thereby, a resist pattern is formed (2).

Next, the master 1a is set in a sputtering apparatus, and a Ni layer 3 (conductive layer) is deposited on the surface.
Turn on. This completes the conductivity treatment. Then, by conducting electricity, Ni electroforming is performed to obtain a Ni plating layer 3 having a predetermined thickness (3). Then, when the Ni plating layer 3 is peeled off from the master 1a, a first mold 3a is obtained (4).

A protective coating (for example, trade name: KLINCOAT S (manufactured by Fine Chemical Japan)) is applied to the uneven surface of the first mold 3a by spin coating. After application, the coating is allowed to air dry. Thereby, the uneven surface is covered with the protective coat. After polishing the back surface of the first mold 3a, the inner diameter and the outer diameter are punched out and dropped. Thus, a donut-shaped first molding die 3a is completed.

The master 1a after the first mold 3a has been peeled off is not damaged. Therefore, after cleaning the master 1a,
Again, this step can be performed to obtain a plurality of first molding dies 3a. By bonding a stainless steel substrate to the back surface of the first molding die 3a with an epoxy adhesive, the planarity of the first molding die 3a is improved.

Next, an ultraviolet curable resin liquid is prepared. The number of colors (APHA) of the resin liquid is 30 to 5 in consideration of heat and light absorption characteristics, mold release properties, light resistance, durability, and hardness.
0 and a refractive index of about 1.4 to 1.8 at 25 ° C. are preferable. The specific gravity of the resin liquid is about 0.8 to 1.3 at 25 ° C,
A viscosity of about 10 to 4800 CPS at 25 ° C. is preferable from the viewpoint of transferability.

Separately, a blue glass disk serving as the glass disk 5 is prepared. Then, the glass disk 5 is washed, a silane coupling agent as a primer is applied to the surface, and then baked. And the first molding die 3a with the uneven surface facing upward
Put resin liquid on the top. Then, the glass disk 5 was pressed from above, and the resin liquid 4 was sandwiched between the glass disk 5 and the first molding die 3a. At this time, care was taken to prevent bubbles from entering the resin liquid 4. Further, the glass disk 5 is pressed to uniformly spread the viscous resin liquid 4 over the entire surface of the first molding die 3a.

The resin liquid 4 is irradiated with ultraviolet rays from a mercury lamp through the glass disk 5. As a result, the resin liquid is hardened to form the second mold 4a made of a hard resin layer (5). Next, the second mold 4a is peeled off from the first mold 3a. The second mold 4a has an integral structure with the glass disk 5 (6).

The first mold 3a left after peeling is
Since it is not damaged, it can be used repeatedly. Therefore,
A large number of second molds 4a can be formed from one first mold 3a. The manufacture of the second mold 4a is easy, and 15 to 6
One sheet can be manufactured in 0 minutes.

Next, based on the second molding die 4a, a third molding die made of metal (a "metal stamper" according to claim 13) is formed. The manufacturing method is the same as that of the first molding die 3a. That is, the second molding die 4a is set in a sputtering apparatus, and a Ni layer 6 (conductive layer) is deposited on the surface, thereby completing the conductive treatment. Electroplating is performed to obtain a Ni plating layer 6 having a predetermined thickness (7), and the Ni plating layer 6 is peeled from the second mold 4a to obtain a third mold 6a (8).

A protective coating (for example, trade name: KLINCOAT S (manufactured by Fine Chemical Japan)) is applied to the uneven surface of the third mold 6a by spin coating. After application, the coating is allowed to air dry. Thereby, the uneven surface is covered with the protective coat. After polishing the back surface of the third mold 6a, the inside diameter and the outside diameter are punched out and dropped. Thus, a donut-shaped third mold 6a is completed. This third mold is used as a stamper for actually manufacturing a disk.

The present inventor manufactured an optical information recording medium using such a manufacturing method while varying the track pitch and the linear velocity of the program area as described in the following examples. I found something.

That is, for an optical information recording medium having a diameter of 120 mm, if the track pitch and the linear velocity are set so that the recording time is from 90 minutes to 120 minutes, the push-pull signal and the reproduced signal of the formed pit have a wavelength of 780 nm.
A conventional recording apparatus and reproducing apparatus having a pickup with a numerical aperture of 0.45 can be obtained with a margin.

Recording and reproduction are possible with an optical information recording medium having a longer recording time, but when compared with an optical information recording medium having a recording time longer than this range,
A stable and good signal can be obtained.

When the recording time reaches 90 minutes or more,
15 to 20 songs can be reliably recorded on an 80 mm disk. Then, as digital information, 79
It becomes possible to record 0 MB or more.

The present invention can be applied to the case where the position of the minimum recording unit is indicated by a time record such as ATIP as described above, and the recording area of the optical information recording medium is other than the above-mentioned area. The present invention can be applied to an optical information recording medium that has been increased as a new area.

[0089]

Next, examples of the present invention will be described below. In the following embodiments, the PCA area and the PMA area are not particularly disclosed, but the optical disc and the stamper of the present embodiment are respectively formed to conform to the standard. Since the optical disk can be used as an optical disk even if it exists between the start of the groove and the start of the PCA area, the PCA area start area and the like are not specified here. (Example 1) An optical disk according to the present invention was manufactured. The size of the optical disk is 120 mm. First, a stamper according to the present invention was manufactured. One important point was the laser cutting process. In this step of recording a groove on a photoresist master, CD-R and CD-RW
ATIP conforming to the format was recorded by groove wobbling (meandering groove).

However, the time code of the ATIP in the program area is incremented by one frame in two frames. PCA, P from ATIP start
ATIP in MA, Lead-in area, Lead-out area
Is incremented by one frame in one frame as usual. The above steps are the same for the following Examples 2 to 5, and only the following conditions are different. Therefore, the description of the above steps is omitted in the description of Examples 2 to 5. I do.

Groove start and ATIP start radius 21m
m, groove end and ATIP end positions 59 mm, lead-in area start time 97:27:00, program area start time 00: 00: 00: 00, lead-out area start time (last possible start time of lead-out area 45:30:02, the track pitch from the groove start position to the lead-in start position is 1.52 μm, the linear velocity (at 1 × speed) is 1.2 m / s, and the track pitch in the lead-in area is 1.52 μm and the linear velocity (1 (At double speed)
1.2m / s, track pitch in program area is 1.34μm, linear velocity (at 1x speed) is 1.2m / s, track pitch in lead-out area is 1.34μm, linear velocity (at 1x speed) is 1.2m / s. did. The program area is 45 minutes, 30 seconds, and 02 frames, but the frame information increases by one second in two seconds (two frames increase by one frame).
It can handle up to four frames in length.

After developing the photoresist master exposed under these conditions, a nickel conductive film is sputtered, nickel electroforming is performed, the nickel plating is peeled from the master, the photoresist is removed, cleaning is performed, a surface protective film is applied, the back surface is polished, Application of the backside protective film, punching of the inner and outer diameters, peeling of the both-sided protective film, and surface cleaning were sequentially performed to produce a stamper. The stamper is set in an injection molding apparatus (SD40 alpha manufactured by Sumitomo Heavy Industries, Ltd.), injection molded, a large number of polycarbonate disk substrates are duplicated, and a long-time CD according to the present invention is manufactured on a CD-R production line (manufactured by Singularus). -R was produced.

The dye is a phthalocyanine dye (Super Green manufactured by Ciba), the solvent is DBE, the protective coat lacquer is a UV-curable coating material (manufactured by DSM), and the printing ink applied thereon is manufactured by Teikoku Ink. This long CD-
1 to 12x speed CD-R writer for R (Plexter)
Was recorded, and the evaluation of recording and reproduction was performed by a CD-R standard inspection device (CD-CATS manufactured by Audio Development). As a result, the lead-in starting radius is
The specification was 22.95mm without any problems, and the program start radius was 24.9mm without any problems.

Further, it was possible to record a long time data of 91 minutes (796 MB). I tested both disc-at-once mode and track-at-once mode, and both were fine. In particular, in the track-at-once mode, data can be additionally recorded, so that data can be recorded little by little on a disc, and the usability is very good.

The present CD-R has a longer time of 12 minutes than the conventional time limit of 79 minutes (91 minutes (796M)).
B) can record a large amount of recording data for a long time, but the jitter of this recording data is land jitter,
The pit jitter was as low as about 20 nsec, and both the pit deviation and the land deviation were spec-in. In addition, I3 and I11 both spec-in and reflectivity 71%,
A low BLER was obtained, the push-pull signal was satisfactory, and the tracking was good. This characteristic is from 1x speed to 12
It was maintained until double speed writing. In addition, Pulstec D
There was no problem with 16 × speed writing and 20 × speed writing by the DU1000, and it was confirmed that the performance was maintained.

(Example 2) An optical disk according to the present invention was manufactured. Groove start and ATIP start radius 21 mm, groove end and ATIP end position 59 mm, lead-in area start time 97:27:00, program area start time 00: 00: 00: 00, lead-out area start time 52:01:01, groove start The track pitch from the position to the lead-in start position is 1.52 μm and the linear velocity (1
1.2m / s at double speed), and the track pitch in the lead-in area is
1.52μm, linear velocity (at 1x speed) is 1.2m / s, track pitch of program area is 1.17μm, linear velocity (at 1x speed) is 1.2m
/ S, the track pitch in the lead-out area was 1.17 μm, and the linear velocity (at 1 × speed) was 1.2 m / s. Program area is 5
Although it is 2 minutes 01 seconds 01 frames, the frame information increases by 1 second in 2 seconds (increases by 1 frame in 2 frames).
Therefore, it can actually correspond to a length of 104 minutes 02 seconds 02 frames. Thereafter, a long-time CD-R according to the present invention was manufactured in the same steps as in Example 1.

The long-time CD-R is converted to a 1- to 12-fold speed CD-R.
Record data with an R writer (Plexter),
Recording and reproduction were evaluated by a CD-R standard inspection device (CD-CATS manufactured by Audio Development). This CD-R can record large-capacity recording data for a long time of 104 minutes (910 MB), which is 25 minutes longer than the conventional 79-minute limit time. The same results were obtained as in Example 1. This characteristic was maintained from 1 × to 12 × writing. Furthermore, there was no problem in 16 × speed writing and 20 × speed writing by the Pulse Tech DDU1000, and it was confirmed that the performance was maintained. It is necessary to superimpose and record a time code called a subcode Q on the written information. The absolute time from the beginning of the program area and its data individually, for example, the time (relative time) for each sector, track, and session are recorded as minutes, seconds, and frames. In the case of CD, the minutes are two digits, so 9
Since 9 minutes is the maximum, the time information of 99 minutes 59 seconds 74 frames or more is reset to 00 minutes 00 seconds 00 frames. However, as described above, ATIP signals are not used for data read control,
Since information on sectors, tracks and sessions written together with information in each frame is used, and even this information is not the same, relative time information can be used, and data recording There is no problem even if the reproduction is performed for 100 minutes or more. However, when recorded as a music CD, since the time display has only two digits, for example, in this case, 104 minutes-100 minutes = 04 minutes 02 seconds 02
Only the frame and the entire time will be displayed. However, in practice, 104 minutes of music are played.

In this embodiment, no matter what kind of material is used, the peak-to-peak value of the signal obtained when crossing the track with a photodetector having a wavelength of 780 nm and a numerical aperture of 0.45, and the signal obtained from the mirror portion The ratio of the magnitudes of the obtained signals was 0.5, and a sufficiently large push-pull signal was obtained. Therefore, an optical disk which can be used was obtained even if the performance of the recording / reproducing apparatus was slightly poor.

(Example 3) An optical disk according to the present invention was manufactured. Groove start and ATIP start radius 21 mm, groove end and ATIP end position 59 mm, lead-in area start time 97:27:00, program area start time 00: 00: 00: 00, lead-out area start time 49:59:74, groove start The track pitch from the position to the lead-in start position is 1.52 μm and the linear velocity (1
1.2m / s at double speed), and the track pitch in the lead-in area is
At 1.52μm, linear velocity (at 1x speed) is 1.2m / s, track pitch of program area is 1.29μm, and linear velocity (at 1x speed) is 1.15m
/ S, the track pitch of the lead-out area was 1.29 μm, and the linear velocity (at 1 × speed) was 1.15 m / s. Program area is 4
9 minutes 59 seconds 74 frames, but frame information increases by 1 second in 2 seconds (2 frames increase by 1 frame)
Therefore, it can actually correspond to a length of 99 minutes 59 seconds 74 frames. Thereafter, a long-time CD-R according to the present invention was manufactured in the same steps as in Example 1.

The long-time CD-R was converted to a 1- to 12-times speed CD-R.
Record data with an R writer (Plexter),
Recording and reproduction were evaluated by a CD-R standard inspection device (CD-CATS manufactured by Audio Development). This CD-R can record a long-time large-capacity recording data of 99 minutes (877 MB), which is 20 minutes longer than the conventional 79-minute limit time. Exactly the same performance as described in Example 1 was obtained. This characteristic was maintained from 1 × to 12 × writing. Furthermore, 1 by Pulstec DDU1000
There was no problem with 6 × speed writing and 20 × speed writing, and it was confirmed that the performance was maintained.

Example 4 An optical disk according to the present invention was manufactured. Groove start and ATIP start radius 21 mm, groove end and ATIP end position 59 mm, lead-in area start time 97:27:00, program area start time 00: 00: 00: 00, lead-out area start time 60:10:01, groove start The track pitch from the position to the lead-in start position is 1.52 μm and the linear velocity (1
1.2m / s at double speed), and the track pitch in the lead-in area is
At 1.52μm, linear velocity (at 1x speed) is 1.2m / s, track pitch of program area is 1.2μm, and linear velocity (at 1x speed) is 1.02m
/ S, the track pitch in the lead-out area was 1.20 μm, and the linear velocity (at 1 × speed) was 1.02 m / s. The program area is 6
It is 0:10:01 frame, but the frame information increases by one second in two seconds (two frames increase by one frame)
Therefore, there is actually a length of 120 minutes 20 seconds 02 frames. Thereafter, a long-time CD-R according to the present invention was manufactured in the same steps as in Example 1.

The long-time CD-R was converted to a 1- to 12-times speed CD-R.
Record data with an R writer (Plexter),
Recording and reproduction were evaluated by a CD-R standard inspection device (CD-CATS manufactured by Audio Development). This CD-R can record large-capacity long-term recording data of 120 minutes (1.05 GB), which is 41 minutes longer than the conventional 79-minute limit time. Gave exactly the same performance as described in Example 1. This characteristic was maintained from 1 × to 12 × writing. Furthermore, there was no problem in 16 × speed writing and 20 × speed writing by the Pulse Tech DDU1000, and it was confirmed that the performance was maintained. It is necessary to superimpose and record a time code called a subcode Q on the written information. The absolute time from the beginning of the program area and its data individually, for example, the time (relative time) for each sector, track, and session are recorded as minutes, seconds, and frames. In the case of a CD, since the minute is indicated by two digits, the same problem as described in the second embodiment occurs, but there is no practical problem.

[0103]

As described above, according to the present invention, the conventional recording apparatus and reproducing apparatus can be used to their full potential while using the conventional recording apparatus and reproducing apparatus. Instead, an optical information recording medium having an increased recording capacity can be provided. Further, in the present invention, transfer is reliably performed during injection molding. further,
The inner diameter hole shape can be processed neatly, and a substrate with less eccentricity can be manufactured.

[Brief description of the drawings]

FIG. 1 shows ATI, which is time code information recorded in advance.
FIG. 3 is a diagram illustrating a configuration of P.

FIG. 2 shows changes in conventional ATIP information every time one frame advances.

FIG. 3 shows a change in ATIP information every time one frame advances in an example of an embodiment of the present invention.

FIG. 4 is a diagram showing an arrangement of recording areas of a CD-R and a CD-RW as an example of an embodiment of the present invention and a distribution of a track pitch or a linear velocity in each area.

FIG. 5 is a diagram showing a method of manufacturing a stamper as an example of an embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Substrate, 1a ... Master, 2 ... Photoresist layer, 3 ... N
i-layer, 3a: first molding die, 4: resin liquid, 4a: second molding die, 5: base (glass disk), 6: Ni layer, 6a: third
Mold

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G11B 7/24 561 G11B 7/24 561N 561Q 7/26 511 7/26 511

Claims (9)

[Claims] 1. A disc-shaped optical information recording medium for recording / reproducing information by a light beam tracked along a meandering groove or land, wherein a PCA area is arranged in order from an inner periphery to an outer periphery. Optical information having a PMA area, a lead-in area, a program area, and a lead-out area, characterized in that prerecorded time code information is increased by one frame for each of a plurality of real frames. recoding media. 2. A meandering groove or land, a time record is defined according to a meandering cycle of the meandering groove or land, and information is recorded by a light beam tracked along the meandering groove or land. An optical information recording medium for reproduction, wherein the time record is increased by one frame for every plural frames. 3. The optical information recording medium according to claim 1, wherein the PCA is sequentially arranged from an inner periphery to an outer periphery.
Area, PMA area, lead-in area, program area,
In those having a lead-out area, a PCA area,
An optical information recording medium, wherein a track pitch of a program area is narrower than a track pitch of a PMA area and a lead-in area. 4. The optical information recording medium according to claim 1, wherein the PCA is sequentially arranged from an inner circumference to an outer circumference.
Area, PMA area, lead-in area, program area,
In those having a lead-out area, a PCA area,
An optical information recording medium characterized in that the track pitches of the program area and the lead-out area are narrower than the track pitches of the PMA area and the lead-in area. 5. The optical information recording medium according to claim 3, wherein the linear velocity of the PCA area is the same as the linear velocity of the program area. 6. One of claims 1 to 3
The optical information recording medium according to the item, which has a PCA area, a PMA area, a lead-in area, a program area, and a lead-out area in order from the inner circumference to the outer circumference, wherein the PCA area, the PMA area, and the read An optical information recording medium, wherein the linear velocity of the program area is lower than the linear velocity of the in area. 7. One of claims 1 to 3
The optical information recording medium according to the item, which has a PCA area, a PMA area, a lead-in area, a program area, and a lead-out area in order from the inner circumference to the outer circumference, wherein the PCA area, the PMA area, and the read An optical information recording medium, wherein the linear velocity of the program area and the lead-out area is lower than the linear velocity of the in area. 8. A disc-shaped optical information recording medium for recording / reproducing information by a light beam tracked along a meandering groove or land, wherein the diameter of the optical information recording medium is 120 mm, Recording time 9
An optical information recording medium for 0 to 120 minutes. 9. One of claims 1 to 8
14. A stamper having a convex portion corresponding to the concave portion formed on the optical information recording medium described in the paragraph and a concave portion corresponding to the convex portion.