JP2002260241A - Light information record medium, stamper and stamper making method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light information record medium that can be used with the conventional drive, has expanded recording capacity without deviating from the standards fixed on the disk and permits stable writing and reading. SOLUTION: The track pitch and linear velocity are similar to the conventional examples in the PCA region, PMA region and read-in region. In contrast at least either the track pitch or linear velocity is smaller than that for the PCA region and PMA region in the program region and readout region. These do not change suddenly but do gradually at the transition regions of the track pitch and linear velocity. Therefore, as the tracking control does not suffer abrupt and large disturbances and the writing or reading speed does not change abruptly, stable writing and reading are performed.

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 medium typified 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 media such as optical discs and magneto-optical discs 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 provided on the surface of a disk-shaped recording medium or changes in 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 terms relating to the optical information recording medium of such a system are described in JIS X6261.
"130mm write-once optical disc cartridge", JISX6
271 "130 mm rewritable optical disk cartridge", and in this specification, the terms described therein are used in the meaning described therein unless otherwise specified.

[0004] In these optical information recording media, meandering grooves and lands are alternately provided spirally, and information is usually written on the grooves. The grooves and lands are used for position control for causing the optical pickup of the recording or reproducing apparatus to travel along the zone where information is written, that is, for position detection for performing tracking. That is, the intensity of the reflected light varies depending on the position of the groove or the land where the light is irradiated. Therefore, the recording or reproducing apparatus receives the signal, controls the position of the optical pickup, and writes 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 area is an area for trial recording by a recording drive, and is used for PM recording.
Area A is an area for recording the memory usage status of the 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 optical pickup provided in the recording apparatus or the reproducing apparatus is shifted and goes out of the program area.

In such an optical information recording medium,
Increasing the recording density of information by reducing the track pitch as much as possible or decreasing the linear velocity (m / s) used for recording and reproducing information can record more information on the same optical information recording medium. It is possible because it is possible. 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 an optical pickup is determined by the wavelength of light used and the numerical aperture (NA) of an optical system.
Therefore, in this technology, a wavelength shorter than the wavelength and the numerical aperture (λ = 780 nm, NA = 0.45) that are usually used,
By using a high NA (λ = 635-685nm, NA = 0.6) and increasing the resolution, the track pitch is reduced and the recording linear density (corresponding to the linear velocity) is increased. As a result, the recording capacity is increased. Is increasing.

However, when a short wavelength, high NA optical pickup is used and recording is performed by a recording apparatus having a small spot size, λ = 780 n, which is normally used, is used.
There is a problem that reading cannot be performed by a reproducing apparatus having an optical pickup with m and 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 disk. In the invention described in JP-A-10-222874, the disc pitch can be identified even when a conventional reproducing apparatus is used by keeping the track pitch and the recording linear density of the lead-in area unchanged. However, there is no change in that information written in the program area cannot be read.

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.

[0013]

As described above,
By using a short wavelength, high NA optical pickup and recording with a recording device with a small light spot size,
Increasing the recording capacity causes a problem that a conventional recording / reproducing apparatus cannot be used. Therefore, other possible methods are within the permissible limits of conventional recording and playback devices,
This is a method in which the track pitch is made as narrow as possible and the linear velocity is made as slow as possible.

However, when such a method is employed, when the track pitch or linear velocity is reduced beyond a certain limit and an optical information recording medium whose recording capacity is increased is inserted into a reproducing apparatus or a recording apparatus, However, there arises a problem that the optical information recording medium is hardly recognized by a reproducing or recording / reproducing apparatus.

Usually, the recording / reproducing apparatus moves the optical pickup to a position near the start position of the lead-in area of the optical information recording medium, pulls in the focus, and recognizes the track of the optical information recording medium. However, if the track pitch of the lead-in area, the PCA area near the lead-in area, and the PMA area is narrow, the focusing of the optical pickup does not work well, and the optical information recording medium cannot be recognized by the device.

The above is described in JP-A-10-222.
The same can be said for the invention described in Japanese Patent No. 874. For example, when the optical information recording medium is mounted on the recording / reproducing apparatus, if the optical pickup is not located in the lead-in area first and is located in the PCA area or the PMA area, if the track pitch or linear velocity is small, For the reasons described above, the optical information recording medium cannot be recognized.

In view of such circumstances, a conventional recording apparatus,
An optical information recording medium that maximizes its performance while using a reproducing apparatus and has an increased recording capacity can be recognized by a conventional recording apparatus and a reproducing apparatus, and a compatible optical information recording medium is obtained. Need that.

In view of such circumstances, the present inventors consider that PC
Invention of an optical information recording apparatus in which the track pitches of the program area and the lead-out area are narrower than the track pitches of the A area, the PMA area, and the lead-in area;
The invention of an optical information recording apparatus in which the linear velocities of the program area and the lead-out area are made slower than the linear velocities of the PMA area and the lead-in area has been made, and a patent application has been filed as another application.

According to experiments conducted by the present inventors, PCA
By increasing the track pitch and linear velocity of the area, PMA area, and lead-in area as compared to the program area corresponding to high-density recording, the optical information recording medium can be recognized by a conventional recording or reproducing apparatus. It has been found that a disc having a large recording capacity can be obtained. According to experimental results at that time, it has been found that there is no problem in tracking and reading / writing of information even when the track pitch or linear velocity changes suddenly in an area where the track pitch or linear velocity changes, that is, in a transition area.

However, depending on the specifications and performance of the device to be developed in the future, if the track pitch or the linear velocity suddenly changes in the transition region, the tracking control system, the recording device,
There is a possibility that the playback device cannot follow and a problem occurs.
When a master disc of an optical disc is manufactured, a laser cutting machine or the like is used. However, control is unstable due to a response delay of the mechanical system, and the track pitch and the linear velocity may be out of the standard.

The present invention has been made in view of such circumstances, and an optical information recording medium is recognized even when used in a conventional recording apparatus and reproducing apparatus, and an optical recording medium having an increased recording capacity. It is an object to provide an information recording medium, a stamper for manufacturing the same, and a method for manufacturing the stamper.

Another object of the present invention is to provide a means necessary for performing stable and reliable optical writing on an optical information recording medium even if the recording capacity of a program area is increased. And

[0023]

In order to solve the above-mentioned problems, a first means of the present invention is a disk-shaped light for recording and reproducing information by a light beam tracked along a meandering groove or land. In an information recording medium 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, the track pitch of the PCA area, the PMA area, and the lead-in area Thus, the optical information recording medium is characterized in that the track pitch in the program area is narrowed and the track pitch is gradually changed in the transition area of the track pitch.

In this means, the track pitch of the program area and the lead-out area is made smaller than the track pitch of the PCA area, the PMA area and the lead-in area,
In order to increase the recording capacity and make it easy to recognize the optical information recording medium, the track pitches of the PCA area, the PMA area, and the lead-in area are widened. 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.

Particularly, in the PCA area, the PMA area, and the lead-in area, since the optical pickup is about to focus first, it is difficult to recognize the optical information recording medium unless the focusing is easy. Therefore, the track pitch in these areas is widened.

The PCA area is an area for trial recording, and the PMA area is an area for recording the memory usage status of the optical information recording medium. In this means, since the track pitch in these areas is not narrow, tracking can be performed reliably, reading and writing can be performed with a sufficient margin, and calibration can be performed reliably.

Preferably, in the optical information recording medium,
Since the lead-in start area and the program start area are determined by the standard, it is preferable to determine the track pitch so as to conform to the standard. The lead-in area start time is
Since it is a manufacturer identification code (M-code) and a code (T-code) indicating a recording method (write strategy), the manufacturer cannot practically arbitrarily change the code. Further, the program area start time from the lead-in area start time is determined by the standard. Therefore, if the track pitch of the lead-in area is also changed, there is a possibility that the disc will become a nonstandard disc. From this viewpoint, it is preferable that the track pitch in this region is not unnecessarily narrowed.

According to our experiments, the PCA region,
It is preferable that the track pitch of the program area and the lead-in area is at least 1.3 μm or more. In this case, by setting the lead-in area start position at least within the standard, it can be used in most recording / reproducing devices.

In this means, since the track pitch is gradually changed in the area where the track pitch changes, that is, in the transition area, no large disturbance suddenly enters the tracking control system in the transition area.
Tracking is performed accurately. The area where the track pitch is changed may be changed, for example, over the lead-in area and the program area, or may be changed at the beginning of the program area. Note that "gradually" means a rate of change that allows tracking to follow sufficiently stably, and this is the same in other claims (means for solving the problem) that change the track pitch.

In this 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.

In the present means, it is preferable from the viewpoint of disc production that the track pitch of the program area and that of the lead-out area be the same, but it is not always necessary to make the track pitch of the lead-out area equal to that of the program area. It may be larger or smaller than the track pitch.

A second means for solving the above-mentioned problem is a disk-shaped optical information recording medium for recording / reproducing information by a light beam tracked along a meandering groove or land. .. Having a PCA area, a PMA area, a lead-in area, a program area, and a lead-out area in this order from the inner circumference to the outer circumference, the track pitch of the PCA area, the PMA area, and the lead-in area is determined by the track pitch of the program area. Optical information recording characterized in that the pitch is narrowed, and in the transition area of the track pitch, the track pitch gradually changes inside the lead-in area, and the change of the track pitch ends in the lead-in area. It is a medium (claim 2).

In this means, since the change in the track pitch between the lead-in area and the program area ends in the lead-in area, there is no change in the track pitch in the program area, and stable writing and reading can be performed. It becomes possible. A third means for solving the above-mentioned problem is the first means or the second means, wherein the track pitch of the lead-out area is narrower than the track pitch of the program area, and in the transition area of the track pitch. Is characterized in that the track pitch is gradually changing (claim 3).

Since the lead-out area is not an area for recording information, there is no problem even if a tracking error occurs to some extent. Therefore, in the present means, the track pitch of the lead-out area is further narrower than the track pitch at which reading and writing can be performed stably. As described above, the recording time of the lead-out area is determined to be, for example, 1 minute and 30 seconds or more. By narrowing the track pitch, the area of the lead-out area occupying the disk can be reduced. Can be used as a program area, so that the recording capacity can be increased.

In this means, since the track pitch is gradually changed in the area where the track pitch changes, that is, in the transition area, a large disturbance does not suddenly enter the tracking control system in the transition area.
Tracking is performed accurately. The area where the track pitch is changed may be changed, for example, at the end of the program area, may be changed across the program area and the lead-out area, or may be changed at the head of the lead-out area.

A fourth means for solving the above problem is as follows.
An optical information recording medium according to any one of the first to third means, wherein the linear velocity of the PCA area is the same as the linear velocity of the program area (claim 4).

The PCA area is subjected to test recording,
Since it is an area for performing calibration when writing in the program area, it is preferable that writing can be performed under the same conditions as possible in the program area. In this means, since the linear velocities of the PCA area and the program area are the same, the size of marks recorded on both can be made the same, and writing and reading can be performed under the same conditions, so that calibration can be performed accurately. Can be done.

A fifth means for solving the above problem is as follows.
The first to fourth means, wherein the width of the groove or land of the program area where the information is recorded or recorded is larger than the width of the land or groove where the information is not recorded. Is also narrow (claim 5).

As the track pitch becomes smaller, the crosstalk tends to increase (deteriorate). However,
Even if the track pitch becomes smaller, crosstalk can be reduced by reducing (narrowing) the recorded or recorded width of the groove or land in the program area. This is because the ratio of the area irradiated to the grooves or lands recorded on the adjacent track in the area irradiated by the light spot irradiated from the optical pickup can be reduced.

Accordingly, the influence of pits formed on adjacent tracks is reduced, and crosstalk is reduced. Further, in the case where the recording layer is formed of a dye, such as a CD-R, the degree of signal modulation obtained from pits tends to increase by reducing the width of the recorded or recorded side. It is preferred.

A sixth means for solving the above-mentioned problem is:
In any one of the first to fifth means, the track pitch of the program area is 1.2 μm or more and 1.3 or more.
It is less than μm (claim 6).

In a conventional recording apparatus and reproducing apparatus having an optical pickup with 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 this means, the track pitches of the PCA area, the PMA area, and the lead-in area are set to values in this range.
Also, the peak-to-peak value of the signal obtained when the optical pickup crosses the track (push-pull signal)
Is greater than or equal to a predetermined ratio with respect to the magnitude of the signal obtained from the mirror-free mirror surface, tracking can be performed stably by a conventional recording apparatus and reproducing apparatus.

By the way, as a result of recording / reproducing by a conventional recording apparatus or reproducing apparatus, according to the knowledge of the present inventors, when the track pitch is 1.1 μm or more, a sufficiently large push-pull signal is generated. can get. The track pitch is more preferably 1.15 μm or more.

Further, in the present means, the track pitch is set to 1.2 μm or more, which is a larger track pitch, so that the productivity of the optical information recording medium according to the present invention is the same as that of the conventional one.

Normally, CD-R, DVD-R, CD-RW
In the case of DVDs and DVD-RWs, the shapes corresponding to the lands and grooves are formed of a plastic resin, a dye layer or a phase change layer is formed thereon, and a necessary reflection film is formed thereon. . When molding this plastic substrate,
It is formed by an injection molding method using a mold having an inverted shape of the shape formed on the plastic substrate. The time required for the shape of the mold to be transferred to the plastic resin is 6 seconds for a normal track pitch.

The inventors of the present invention have determined the minimum track pitch that can be transferred within this time. As a result, if the track pitch is 1.2 μm or more, it is possible to meet the standard molding time of 6 seconds. I understood. Therefore, the productivity is the same as that of a conventional CD or CD-R / RW, and it is possible to produce an optical information recording medium having an increased recording capacity while maintaining high productivity.

If the upper limit of the track pitch in the program area is less than 1.5 μm, high density can be achieved. However, in order to obtain complete compatibility in the present means, the upper limit of the track pitch is set to less than 1.3 μm so that tracking can be performed even with a tracking method based on a small three-beam method. That is, in the case where the tracking by the three-beam method is applied, if the value is larger than this value, the sub-spot for detecting the tracking error is greatly affected by the bit formed in the adjacent track. This value was set so that the center of the track was not read.
At present, most are one-beam systems, and if only one-beam system is targeted, there is no need to be bound by this upper limit.

A seventh means for solving the above-mentioned problem is as follows.
The optical information recording medium of the sixth means, wherein the amount of eccentricity of each groove or land of the optical information recording medium is 30 μm or less (Claim 7).

In this means, the inventors have found by experiment the amount of eccentricity that facilitates tracking even when the track pitch is narrow, and as a result, the inventor has found that the amount is preferably 30 μm or less.

Eighth means for solving the above-mentioned problem is:
Any one of the first means to the seventh means, wherein the linear velocity of the program area is 1.0 m / s or more (claim 8).

As a result of finding the minimum linear velocity at which the minimum mark can be resolved in a conventional recording apparatus and reproducing apparatus having a wavelength of 780 nm and NA = 0.45, according to the knowledge of the present inventors, the linear velocity is
It was found that the resolution could be improved if it was 0.90 m / s or more. Further, in the present means, the minimum linear velocity necessary for obtaining a sufficient value of the degree of modulation of the 3T mark or the degree of modulation of the 11T mark in a conceivable reproducing apparatus or recording / reproducing apparatus has been obtained. As a result, it has been found that when the linear velocity is 1.0 m / s or more, a stable signal can be reproduced from the optical information recording medium at the time of reading and writing.

Next, in order to solve the above-mentioned problem, a ninth means of the present invention is a disk-shaped optical information recording medium for recording / reproducing information by a light beam tracked along a meandering groove or land. The track pitches of the PCA area, the PMA area, the lead-in area, and the program area in the order of 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. Thus, the track pitch in the lead-out area is narrowed, and in the transition area of the track pitch, the track pitch gradually changes (claim 9).

In this means, only the track pitch in the lead-out area is narrowed. The reason and effect of narrowing the track pitch in the lead-out area and the reason and effect of gradually changing the track pitch in the transition area of the track pitch are the same as those of the third means.

A tenth means for solving the above-mentioned problem is a disk-shaped optical information recording medium for recording / reproducing information by a light beam tracked along a meandering groove or land. From toward the outer circumference,
In the order having a PCA area, a PMA area, a lead-in area, a program area, and a lead-out area in order,
From the linear velocity in the CA area, PMA area, and lead-in area,
An optical information recording medium according to claim 10, wherein the linear velocity in the program area is reduced, and the linear velocity gradually changes in the transition area of the linear velocity.

An eleventh means for solving the above-mentioned problem is a disk-shaped optical information recording medium for recording / reproducing information by a light beam tracked along a meandering groove or land. From toward the outer circumference,
In the order having a PCA area, a PMA area, a lead-in area, a program area, and a lead-out area in order,
From the linear velocity in the CA area, PMA area, and lead-in area,
The linear velocity in the program area is reduced, and in the transition area of the linear velocity, the linear velocity gradually changes inside the lead-in area, and the change in the linear velocity ends in the lead-in area. Optical information recording medium (claim 11)
It is.

A twelfth means for solving the above-mentioned problem is the tenth means or the eleventh means, wherein the linear velocity of the lead-out area is made slower than the linear velocity of the program area. It is a feature (claim 12).

A thirteenth means for solving the above-mentioned problem is a disk-shaped optical information recording medium for recording / reproducing information by means of a light beam tracked along a meandering groove or land. From toward the outer circumference,
In the order having a PCA area, a PMA area, a lead-in area, a program area, and a lead-out area in order,
Optical information characterized in that the linear velocity in the lead-out area is made slower than the linear velocity in the CA area, the PMA area, the lead-in area, and the program area, and the linear velocity changes gradually in the transition area of the linear velocity. Recording medium (Claim 13)
It is.

In the tenth to thirteenth means, respectively, the first to third means and the ninth means
While the track pitch is changed by means of
The only difference is that the linear velocity is changed. Therefore,
Each has the same purpose as the first to third means and the ninth means, and has the same function and effect. In addition,
The term “gradually” refers to a rate of change such that recording and reproduction can sufficiently follow the same stably, and this is the same in other claims (means for solving the problem) that change the linear velocity.

In the tenth means, it is preferable in terms of disc production that the program area and the lead-out area have the same linear velocity. However, it is not always necessary to make the same. May be the same as the PCA area, the PMA area, and the lead-in area.

A fourteenth means for solving the above-mentioned problem is any one of the tenth means to the thirteenth means, wherein the track pitch of the PCA area, the PMA area, and the lead-in area is determined based on the track pitch of the program area. The track pitch is narrowed (claim 14).

In this means, any of the tenth means to the thirteenth means employs the method of the first means. Therefore, due to these synergistic effects,
Further, the recording capacity of the program area can be increased.

A fifteenth means for solving the above-mentioned problem is the fourteenth means, wherein the track pitch of the lead-out area is narrower than the track pitch of the program area ( Claim 15).

In the present means, the fourteenth means includes:
Further, the method of the third means is adopted. Therefore,
Due to these synergistic effects, the recording capacity of the program area can be further increased.

A sixteenth means for solving the above-mentioned problems is any one of the tenth means to the thirteenth means, wherein a track pitch of a PCA area, a PMA area, a lead-in area, and a program area is determined. The lead pitch of the lead-out area is narrowed (claim 16).

In this means, any of the tenth means to the thirteenth means is used, and the method of the ninth means is employed. Therefore, due to these synergistic effects,
Further, the recording capacity of the program area can be increased.

A seventeenth means for solving the above-mentioned problem is any one of the fourteenth means to the fifteenth means, wherein the track pitch of the program area is not less than 1.2 μm and less than 1.3 μm. Features (Claim 17)
It is.

In this means, any one of the fourteenth means to the fifteenth means, and further the sixth means is employed. Therefore, an optical information recording medium with high productivity and high recording capacity can be obtained while increasing the recording capacity of the program area by the synergistic effect. Therefore, the storage capacity per unit area is large, and the price can be kept low, so that a high-density recording medium acceptable to consumers can be obtained.

An eighteenth means for solving the above-mentioned problem is the seventeenth means, wherein each groove or land of the optical information recording medium has an eccentricity of 30 μm or less. Item 18).

In the present means, since the seventh means is applied to the seventeenth means, the synergistic effect thereof facilitates tracking even if the recording capacity becomes large. A nineteenth means for solving the above-mentioned problem is any one of the tenth means to the eighteenth means, wherein the linear velocity of the program area is 1.0 m / s or more. (Claim 19).

In this means, any one of the tenth means to the eighteenth means, and the eighth means is employed. Therefore, an optical information recording medium with high compatibility, in which the recording capacity of the program area is increased and the recording / reproducing of the program area is ensured while increasing the recording capacity of the program area by the synergistic effect.

A twentieth means for solving the above-mentioned problem is any one of the ninth means to the nineteenth means,
The width of the groove or land of the program area where the information is recorded or recorded is narrower than the width of the land or groove where the information is not recorded (claim 20).

This means is any one of the ninth means to the nineteenth means, and further employs the fifth means. Therefore, it is possible to obtain an optical information recording medium capable of obtaining a signal with less noise while increasing the recording capacity of the program area by a synergistic effect.

A twenty-first means for solving the above-mentioned problem is a disc-shaped optical information recording medium according to any one of the first to twentieth means, wherein The diameter is 8cm and the maximum recording time is 30-40
Minutes (claim 19).

When the diameter of the optical information recording medium is 8 cm,
Recordable time as CD digital audio 30 ~
By forming a program area having a length of 40 minutes, its usefulness is improved, as will be described later, and it can be used as a recording medium of a small-sized photographing device or a recording device.

In the case of an optical information recording medium capable of recording as digital audio for 30 minutes, in the ISO 19660 Mode 1 format which is a standard of CD as digital information,
265 MB can be recorded. In the present means, the lower limit of the recording time is limited to 30 minutes in order to ensure that there is no more data on an 8 cm disc at present and to be able to reliably record six songs.

If the time is longer than 40 minutes, the track pitch or linear velocity of the program area in the 8 cm optical information recording medium becomes too small, so that tracking cannot be performed, pits cannot be obtained with a sufficient modulation degree, jitters cannot be obtained. Becomes large, and recording becomes impossible.

A twenty-second means for solving the above-mentioned problem is the optical information recording medium of the twenty-first means, wherein a track pitch of said program area is 1.2 μm or more and 1.3 μm.
m, and the linear velocity of the program area is 1.0 m
/ S or more and 1.13 m / s or less (claim 22).

The present means is the same as the twenty-first means, but also the sixth means.
This is an invention in which the above-mentioned means and the eighth means are applied together. Then, the maximum value of the linear velocity was set to 1.13 μm so that the maximum recording time could be maintained for 30 minutes or more. By doing so, an optical information recording medium having a diameter of 8 cm with an increased storage capacity and improved utility value can be obtained.

A twenty-third means for solving the above-mentioned problem is a disk-shaped optical information recording medium for recording / reproducing information with a light beam tracked along a meandering groove or land. From toward the outer circumference,
In one having a PCA area, a PMA area, a lead-in area, a program area, and a lead-out area in order, in the PCA area, at least one of a track pitch and a linear velocity is made larger than other areas, and In the transition region where the linear velocity changes,
An optical information recording medium characterized in that these are gradually changing.

In this means, since the track pitch and the linear distance are increased in the PCA area where important information can be obtained at the time of optical writing, writing and reading in the PCA area are facilitated.

That is, as described above, the PCA area is an area for performing power calibration when writing to the optical information recording medium. Therefore, in order to perform accurate calibration on the medium, it is necessary to grasp the state of the pits obtained by test writing as accurately as possible. According to this means, when an optical pickup having an optical characteristic that is not so excellent is used, it is more preferable than applying the above-described invention in which the linear velocity between the PCA area and the program area is made the same. Results may be obtained. In such a recording apparatus, PCA
It is easier to form a suitable mark while increasing the recording capacity by using an optical information recording medium in which the track pitch or linear velocity in the area is larger than in other areas and the recording density of the program area is improved. .

Here, "to make it larger than other areas" includes "to make it larger than other areas" by reducing the conventional track pitch and linear velocity in other areas. It is a thing.

In this means, if the track pitch or the linear velocity changes abruptly in the transition region where the track pitch or the linear velocity changes, a tracking error may occur. In this means, since the track pitch and the linear velocity gradually change in the transition region, no tracking error occurs. In addition,
“Slowly” means a rate of change that does not cause a tracking error.

A twenty-fourth means for solving the above-mentioned problem is a disk-shaped optical information recording medium for recording / reproducing information by means of a light beam tracked along a meandering groove or land. From toward the outer circumference,
In one having a PCA area, a PMA area, a lead-in area, a program area, and a lead-out area in order, at least one of the track pitch and the linear velocity in the PMA area is made larger than the other areas, and In the transition region where the linear velocity changes,
An optical information recording medium characterized in that these are gradually changing.

In this means, since the track pitch and the linear distance are increased in the PMA area where important information can be obtained at the time of optical writing, writing and reading in the PMA area are facilitated.

As described above, in the PMA area, the used program area is recorded, and the result of the power calibration performed at the time of the first writing is also recorded.
Therefore, it is necessary to accurately read out the information written in the PMA area and then additionally write the information on the optical information recording medium. Therefore, the track pitch and the linear velocity in the PMA area are made larger than those in the other areas so that reading is possible in the PMA area and writing can be reliably performed on the optical information recording medium. Is preferred.

Here, “to make the area larger than the other area” also means that the conventional track pitch or linear velocity is made smaller in the other area to make it larger than the other area. Including.

In this means, if the track pitch or the linear velocity changes abruptly in the transition area where the track pitch or the linear velocity changes, a tracking error may occur. In this means, since the track pitch and the linear velocity gradually change in the transition region, no tracking error occurs. In addition,
“Slowly” means a rate of change that does not cause a tracking error.

A twenty-fifth means for solving the above-mentioned problem is a disk-shaped optical information recording medium for recording / reproducing information by means of a light beam tracked along a meandering groove or land. From toward the outer circumference,
In one having a PCA area, a PMA area, a lead-in area, a program area, and a lead-out area in order, at least one of the track pitch and the linear velocity in both the PCA area and the PMA area is made larger than other areas. An optical information recording medium characterized in that these change gradually in a transition area where a track pitch or a linear velocity changes.

By making the track pitch and linear velocity larger in both the PCA area and the PMA area than in other areas, a synergistic effect of the effects described in the twenty-third means and the twenty-fourth means can be produced. It is preferable because it is possible. That is, in both the initial writing and the additional writing,
Stable writing becomes possible. Therefore, a suitable writable optical disk can be provided irrespective of a writing method such as a disk-at-once writing method or a track-at-once writing method. In this case, it is not necessary to make the track pitch and the linear velocity the same in the PCA area and the PMA area.

A twenty-sixth means for solving the above-mentioned problems is the first to the twenty-second means, wherein at least one of the track pitch and the linear velocity in the PCA area is made larger than in other areas. In the transition region where the track pitch or the linear velocity changes, these change gradually.

A twenty-seventh means for solving the above-mentioned problems is the first means to the twenty-second means, wherein at least one of the track pitch and the linear velocity in the PMA area is made larger than in other areas. In a transition region where the track pitch or the linear velocity changes, these gradually change (claim 27).

A twenty-eighth means for solving the above-mentioned problems is the first means to the twenty-second means, wherein at least one of the track pitch and the linear velocity in both the PCA area and the PMA area is other than the other. The present invention is characterized in that, in a transition region in which the track pitch or the linear velocity changes while being larger than the region, these change gradually.

The twenty-sixth means, the twenty-seventh means, and the twenty-eighth means include the twenty-third means, the twenty-fourth means, and the twenty-fifth means, respectively, from the first means to the twenty-second means. The meanings of the respective terms are the same as those described in the description of the twenty-third means, the twenty-fourth means, and the twenty-fifth means. These means have both the features of the first to the twenty-second means and the features of the twenty-third, the twenty-fourth, and the twenty-fifth means. Therefore, the operation and effect of each of the first to twenty-second means and the operation and effect of each of the twenty-third, twenty-fourth, and twenty-fifth means can be obtained together. .

If the linear velocity of the PCA area is made higher than the linear velocity of the program area by the twenty-sixth means, the combination cannot be made with the fourth means. It goes without saying that such unrealizable combinations are excluded from this means. The same applies to other means (claims).

A twenty-ninth means for solving the above-mentioned problem is a disc-shaped optical information recording medium, in which a PCA area, a PMA area, a lead-in area, a program area, In the one having a lead-out area, the track pitch of the program area is narrower than the track pitch of the PCA area, the PMA area, and the lead-in area, and the track pitch is gradually changed in the transition area of the track pitch. An optical information recording medium (claim 29).

A thirtieth means for solving the above-mentioned problem is a disc-shaped optical information recording medium, which includes a PCA area, a PMA area, a lead-in area, a program area, In a device having a lead-out area, the track pitch in the lead-out area is smaller than the track pitch in the program area, and in the transition area of the track pitch, the track pitch is gradually changed. An information recording medium (claim 30).

A thirty-first means for solving the above-mentioned problem is a disc-shaped optical information recording medium, which includes a PCA area, a PMA area, a lead-in area, a program area, In the one having a lead-out area, the linear velocity in the program area is made smaller than the linear velocity in the PCA area, the PMA area, and the lead-in area, and in the transition area of the linear velocity, the linear velocity changes gradually. An optical information recording medium characterized by the above features.

A thirty-second means for solving the above-mentioned problem is a disc-shaped optical information recording medium, which includes a PCA area, a PMA area, a lead-in area, a program area, An optical information recording device having a lead-out area, wherein the linear velocity in the lead-out area is made smaller than the linear velocity in the program area, and the linear velocity gradually changes in the transition area of the linear velocity. It is a medium (claim 32).

A thirty-third means for solving the above-mentioned problem is that the track pitch of the program area is not less than 1.2 μm and not more than 1.3 μm.
An optical information recording medium having a diameter of less than μm.

A thirty-fourth means for solving the above-mentioned problem is an optical information recording medium wherein the linear velocity of the program area is 1.0 m / s or more.

As described above, these means can prevent a sudden large disturbance from entering the tracking control system of the recording or reproducing apparatus in the transition area where the track pitch changes, and can reduce the recording capacity corresponding to the standard. It is possible to obtain a high optical information recording medium.

A thirty-fifth means for solving the above-mentioned problem has a convex portion corresponding to a concave portion formed on the optical recording medium, which is the first to 34th means, and a concave portion corresponding to the convex portion. It is a stamper (Claim 35).

According to this means, the third means can be used from the first means.
The optical information recording medium, which is one of the four means, can be efficiently manufactured. The thirty-sixth for solving the above problems
The means according to the thirty-fifth aspect is the stamper according to the thirty-fifth aspect, wherein an eccentric amount of the concave portion or the convex portion formed on the stamper is 10 μm or less.

According to this means, in order to obtain an optical information recording medium having a small eccentricity and easy tracking, the eccentricity of the track formed on the stamper is set to 10 μm or less. It became clear. Therefore, when manufacturing the stamper, the eccentricity of the truck should be 10 μm.
It is preferable to set the following.

A thirty-seventh means for solving the above-mentioned problems is a method for producing a stamper according to the thirty-fifth means or the thirty-sixth means, wherein a step of preparing a first metal mold is provided; A stamper comprising: a step of molding a second resin mold from a first mold; and a step of molding a metal stamper as a third mold from the second mold. (Claim 37).

In this means, first, a stamper which can be used for manufacturing the optical information recording medium as the first to thirty-fourth means by an electroforming method, a metal film forming method or the like. A first mold is manufactured. Then, instead of directly manufacturing the information recording medium with the first molding die, the first molding die is pressed against a resin to form a mold, thereby forming a second molding die made of a resin having irregularities opposite to the first molding die. Is molded.

Thereafter, using the second mold, a metal stamper is molded by the same method as that for manufacturing the first mold. In this way, instead of directly manufacturing an optical recording medium using the stamper, which is the first mold, a number of second molds are manufactured, from which the third mold is actually used as a stamper. Therefore, a large number of stampers can be manufactured by a simple process without performing the lithography process many times.

[0109]

Embodiments of the present invention will be described below with reference to the drawings. In the following description of the embodiments and examples, the wavelengths most frequently used at present are
780 nm, a recording device using an optical pickup having a numerical aperture of about 0.45, a reproducing device may be described as an example, but the present invention, except for those specifically limited to that in the column of "means to solve the problem" Therefore, it is not used only for such a recording device and a reproducing device, and a wavelength and a numerical aperture are different.
Therefore, the present invention can be used for a recording device and a reproducing device having different resolutions, and can also be used when a standard conforming to the specifications of such a recording device and a reproducing device is established.

FIG. 1 is a schematic configuration diagram of a physical format of an optical information recording medium represented by CD-R and CD-RW according to the first embodiment of the present invention. The right side of FIG. 1 shows the inner peripheral side of the optical information recording medium, and the left side of FIG. 1 shows the outer peripheral side of the optical information recording medium. Optical information recording medium 1
Consists of a non-recording area, a PCA area, a PMA area, a lead-in area, a program area, and a lead-out area from the inner circumference to the outer circumference. The meandering pre-groove 2 is formed in the optical information recording medium 1.

The pre-groove 2 is wobbled in a meandering manner based on a signal (ATIP signal) obtained by combining a reference signal having a predetermined frequency and preformat information. In a recording device that writes information on an optical information recording medium,
The reflected light quantity of 2 is demodulated from this pre-groove, and recording and reproduction are performed based on the obtained pre-format information. Note that the pre-groove 2 according to the embodiment of the present invention.
Is FM-modulated at a carrier frequency of 22.05 kHz. This pre-groove 2 is a CD-R or CD-R
It is formed continuously over the W PCA area, PMA area, lead-in area, program area, and lead-out area.

When recording, first, the optical pickup of the recording / reproducing apparatus is moved to the vicinity of the start position of the lead-in area in the inner area of the optical information recording medium 1, and the optical information is recorded at a predetermined rotational speed. The recording medium 1 is rotated. Then, the optical pickup moves to the start position of the lead-in area from the read preformat information. Then, the pre-groove in the lead-in area is demodulated, and the maximum recordable time and
The recommended writing light power and disk application code are read.

Then, trial writing is performed in the PCA area,
Calibration is performed so that the power of the writing light becomes the optimum power. Also, before and after the power calibration, the PMA area is read, and necessary address information is read at the time of additional writing.

In the first embodiment of the present invention, the following points are also taken into consideration.

That is, when demodulating the pre-groove, it is necessary to focus on at least the position where the optical pickup is located first. Therefore, in the first embodiment of the present invention, the PCA area and the PMA area inside the lead-in area are all wider than the program area. By doing so, focusing of the optical pickup can be easily performed, and, in fact, in a program area where information is recorded, a high recording capacity is achieved by reducing a track pitch.

In the CD-R and CD-RW standards,
The standard specifies 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, the CD-ROM according to the present embodiment is set so that the lead-in area start radius falls within the standard.
R and CD-RW are formed.

By the way, the starting radius of the lead-in area and the starting radius of the program area are determined at predetermined positions.
The lead-in area start time is determined by the manufacturer identification code (M-
code) and the recording method (write strategy)
, Which cannot be arbitrarily changed by the manufacturer. Further, the program area start time from the lead-in area start time is determined by the standard. Then, the size of the lead-out area is also 1 in terms of recording time.
The standard specifies that the time is 30 minutes or more.

In order to sufficiently satisfy such a standard, P
The track pitch of each of the CA area, the PMA area, and the lead-in area was set to about 1.5 μm to 1.7 μm as in the related art. Also, the linear velocity is preferably around 1.2 m / s.

In this way, a conventional recording / reproducing apparatus has sufficient compatibility.

In the first embodiment of the present invention, the track pitch changes gradually in the portion where the track pitch changes. This region is referred to as a transition region of the track pitch in this specification. In the first embodiment, as shown in FIG. 1, the transition area A of the track pitch is provided in the lead-in area. The pitch gradually decreases in the latter half of the lead-in area, and the change in the track pitch ends in the lead-in area. By gradually changing the track pitch in this manner, there is no possibility that a large disturbance enters the tracking control device to disturb the tracking, or that the recording and reproduction speed changes suddenly to cause an error. Further, since there is no change in the track pitch in the program area, stable writing and reading can be performed.

FIG. 2C shows the arrangement of the recording areas and the track pitch in each area in the first embodiment.

In FIG. 2, (a) shows the arrangement of the recording areas of the optical information recording medium. The recording area has no groove from the center, the PCA area, the PMA area, the lead-in area, the program area, The lead-out area is followed by a non-recording area having no groove.

FIGS. 2B to 2E are diagrams showing the distribution of track pitch or linear velocity corresponding to each area. (B) corresponds to a conventional optical information storage medium such as a CD-R, and has a constant track pitch and linear velocity in the PCA area, PMA area, lead-in area, program area, and lead-out area. .

FIG. 2C corresponds to an optical information storage medium such as a CD-R according to the first embodiment of the present invention.
The track pitch is larger in the PCA area, PMA area, and lead-in area than in the program area in order to ensure that information recorded in these areas can be written and read.

On the other hand, in the program area and the lead-out area, the track pitch is set to the PCA area, P
It is smaller than those in the MA area and lead-in area. Thus, the recording density of the program area is improved. A transition area A of the track pitch is provided in the latter half of the lead-in area, and the track pitch gradually decreases in the transition area A and becomes a predetermined track pitch at the start of the program area. Therefore, the followability of the optical pickup of the reproducing apparatus or the recording apparatus is improved, and the tracking error hardly occurs.

The minimum required track pitch in the program area is 1.1 μm. If the track pitch is wider than 1.1 μm, a push-pull signal for tracking control can be obtained even in a conventional recording apparatus and reproducing apparatus. Preferably, if the track pitch is 1.15 μm or more, a sufficiently large push-pull signal can be obtained with a margin.

However, if the track pitch is too narrow, the productivity will decrease during the manufacture of the optical information recording medium. Therefore, in the first embodiment of the present invention, the thickness is set to 1.2 μm or more.

Normally, in manufacturing CD-R, DVD-R, CD-R, and CD-RW, a stamper having a shape corresponding to a land and a groove is used. This stamper is a mold for forming lands and grooves on a plastic substrate. Using this stamper, a plastic substrate is formed by an injection molding method. The optical information recording medium is manufactured by forming a dye layer and a phase change layer on a molded plastic substrate, and further forming a necessary reflective film and the like.

In molding this plastic substrate, it is necessary to allow the plastic resin to sufficiently spread over the concave and convex surfaces of the stamper, and to cool and solidify the plastic resin. In a conventional optical information recording medium, this time is 6 seconds. Other steps for manufacturing the optical information recording medium are also set so as to be synchronized with this time. Thus, the conventional optical information storage medium such as a CD-R is manufactured at a low price. In order to maintain the productivity of the optical information recording medium according to the first embodiment of the present invention, it is not necessary to spend much time on the molding process of the plastic substrate.

It is possible to shorten the time required to sufficiently spread over the uneven surface of the stamper surface by increasing the mold temperature or improving the mold clamping force. However, when the former method is employed, the cooling time is increased and the time spent is increased. In addition, if the latter method is adopted, the mold clamping device itself must be changed, resulting in an increase in cost. Thus, the present inventors have studied the track pitch for enabling molding in 6 seconds even when using the conventional plastic substrate molding process.
It has been found that such a condition is satisfied if it has a thickness of at least μm.

If the upper limit of the track pitch in the program area is less than 1.5 μm, high density can be achieved. Further, in order to obtain complete compatibility in the present means, the upper limit of the track pitch is set to less than 1.3 μm so that tracking can be performed even with three-beam tracking, which is currently small. If the value is larger than this value, the sub spot for detecting the tracking error is greatly affected by the mark formed on the adjacent track. Therefore, this value is set so that the sub spot does not read the center of the adjacent track. . Even if there is a sub-spot on the periphery of the adjacent track and the sub-spot moves along the adjacent track, the track pitch between the target track and both adjacent tracks is equal. Since the track is tracked, there is no problem in tracking.

Next, an optical information recording medium according to a second embodiment of the present invention will be described.

FIG. 3 shows a physical format of an optical information recording medium according to the second embodiment. In the optical information recording medium according to the second embodiment, the linear velocity is reduced instead of decreasing the track pitch. In particular,
The linear velocities in the PCA area, the PMA area, and the lead-in area are large enough to conform to the standard. On the other hand, the linear velocity is lower in the program area and the lead-out area than in the PCA area, the PMA area, and the lead-in area. Therefore, the recording density of the program area is increased, and the area of the lead-out area can be reduced, so that the recording capacity can be increased.

The linear velocities are set in the PCA area, the PMA area,
The reason why each area of the lead-in area is larger than the program area is as follows.

In a conventional recording / reproducing apparatus, in order to recognize the optical information recording medium 1, focusing is performed as described above, and tracking control is performed. Further, the recording / reproducing apparatus obtains an ATIP signal from a pre-groove obtained for rotating the information recording medium at a predetermined linear velocity. In a conventional optical information recording medium, a linear velocity of 1.2
An ATIP signal having a carrier frequency of 22.05 kHz is obtained at m / s to 1.3 m / s. However, if the linear velocity is reduced in all areas of the optical information recording medium in order to increase the recording capacity, the optical information recording medium will be driven to rotate at a normal rotation speed at the start of rotation driving.

Therefore, the AT obtained from the optical pickup
The carrier frequency of the IP signal will be higher than 22.05 kHz. The circuit that controls the rotation of the optical information recording medium,
It is only necessary to be able to pull in to a sufficiently high frequency, but it is not always possible to pull in to a higher frequency than a certain level. Further, the inability to pull in the ATIP signal makes it impossible to control the rotation of the optical information recording medium or the movement of the pickup.

Therefore, in the second embodiment of the present invention, in order to be applicable to all recording / reproducing apparatuses, the PCA area, the PMA area, and the lead-in area are the same as the conventional optical information recording medium. The linear velocity was on the order of magnitude.

In the case of the optical information recording medium according to the second embodiment and the master disk of the disk for manufacturing the optical information recording medium, when the linear velocity is reduced, the optical information recording medium is formed in the rotation direction of the medium. This can be achieved by reducing the length of one cycle of the meandering amplitude of the pregroove. Therefore, when forming a disk having a wobble-shaped pre-groove or its master, the linear velocity can be reduced by shortening the length of the meandering amplitude consumed in one cycle.

A transition area A of the linear velocity is provided between the lead-in area and the program area so that the linear velocity does not suddenly change. By providing the transition region in which the linear velocity gradually changes, no load is imposed on the motor for rotating the medium and its control device.

Incidentally, the linear velocity in the program area was set as follows. Wavelength 780 nm, NA =
As a result of obtaining the minimum linear velocity in a recording apparatus and a reproducing apparatus having a conventional optical pickup of 0.45 on condition that the minimum mark has a length capable of resolving the minimum mark, according to the knowledge of the present inventors, It was found that resolution could be achieved if the linear velocity was 0.90 m / s or more. Therefore, by setting the linear velocity of the program area within the above range, the storage capacity is greatly increased.

Further, the present inventors have proposed a reproducing apparatus or a recording / reproducing apparatus in which the degree of modulation by the 3T mark (hereinafter, referred to as “I3”) and the degree of modulation of the 11T mark (hereinafter, referred to as “I11”) can be considered. Thus, the minimum linear velocity for obtaining a sufficient value was determined. As a result, it has been found that when the linear velocity is 1.0 m / s or more, a stable signal can be reproduced from the optical information recording medium at the time of reading and writing. At this speed, the jitter can be achieved at 35 ns or less, and a good signal can be written and read.

The distribution of the linear velocities corresponding to the respective regions in the second embodiment of the present invention is as shown in FIG. At this time, the vertical axis is considered as the linear velocity in FIG.

As described above, in the first and second embodiments of the present invention, the track pitch or linear velocity of the program area is made smaller than that of the PCA area, the PMA area, and the lead-in area. At a wavelength λ = 780 nm, N
It is possible to obtain a high-density optical information recording medium which can be used even with a conventional recording / reproducing apparatus having A of about 0.45.

Further, not only one of the track pitch and the linear velocity in the program area is reduced, but also both the track pitch and the linear velocity are set in the PCA area and the PM.
By making the area smaller than the area A and the lead-in area, the recording capacity can be further improved. Note that the optimum track pitch and linear velocity in the program area are not less than 1.2 μm and 1.3 μm for the track pitch for the reason described above.
m, and the linear velocity is also preferably 1.0 m / s or more. Further, the upper limit of the linear velocity is 8 cm CD-R or CD
-1.13 to add useful commercial value to RW
m / s or less is good.

Next, a description will be given of an optical information recording medium according to a third embodiment having a larger storage capacity than that of the above-described embodiment. In this optical information recording medium, at least one of the track pitch and the linear velocity is made smaller in the lead-out area than in the program area. This is because the standard determined in the lead-out area only determines that the time of the lead-out area is 1 minute and 30 seconds or more.
Therefore, 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. Can be.

A transition area B of track pitch or linear velocity is provided between the lead-in area and the program area, and a transition area C of track pitch or linear velocity is provided near the start of the lead-out area. In the optical information recording medium according to the third embodiment, the transition area B is formed so as to straddle the lead-in area and the program area. The transition area C exists only in the lead-out area.

The distribution of the track pitch or the linear velocity corresponding to each area in the optical information recording medium according to the third embodiment is as shown in FIG. FIG. 4 shows a schematic diagram of the physical format of the optical information recording medium when the track pitch is changed as in the third embodiment. FIG. 4 is a schematic diagram of the physical format when only the track pitch is changed.

Next, an optical information recording medium in which the recording capacity of the program area is increased without making the track pitch or linear velocity of the program area smaller than those of the PCA area, the PMA area, and the lead-in area will be described.

In the optical information recording medium, at least one of the track pitch and the linear velocity is smaller in the lead-out area than in the other areas. FIG. 2E shows the linear velocity or the distribution of the linear velocity corresponding to each area of the optical information recording medium. The transition area D was formed at the end of the program area.

In this optical information recording medium, 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. The recording capacity of the area can be increased.

Incidentally, it is preferable that the transition area is not provided in the program area, but is provided, for example, at the end of the lead-in area or the lead-out area. For example,
Although the TOC information is written in the lead-in area, the recording apparatus normally writes the same information repeatedly until the entire lead-in area is filled. Therefore, since necessary information is read at the beginning of the lead-in area, the end of the lead-in area is not required. Therefore, even if the transition region is provided therein, the transition region is less likely to be adversely affected. Further, since no special information is written in the lead-out area, even if a transition area is provided in this area, the transition area is not easily affected by the provision of the transition area.

In the present invention, as a preferable optical information recording medium, the recording capacity in the program area is reduced by making the track pitch and linear velocity in the program area smaller than those in the PCA area, the PMA area, and the lead-in area as described above. Although it is possible to increase, it is more preferable that the linear velocity is the same in the PCA area and the program area.

Normally, in an optical information recording medium such as a CD-R or CD-RW, trial writing is performed in the PCA area in order to calibrate an optimum optical power at the time of writing, and an optimum power for each medium is found. . When writing to the program area, the recommended power value is obtained from the ATIP signal obtained from the pre-groove in the PCA area,
Some marks are written in the PCA area by the laser power whose value is shifted back and forth from the recommended power value. And
The optimum mark is written with the obtained power.

However, if the linear velocity in the PCA area is different from the linear velocity in the program area, the power per unit area changes, so that the write power in the program area may not be an appropriate value. . In order to prevent such a situation, it is preferable that the PCA area and the program area be the same in linear velocity.

In order not to put a burden on a motor for rotating a disk provided in a recording apparatus or a reproducing apparatus, a PCA area, a PMA area, a lead-in area,
It is preferable that the linear velocity be the same over the program area. Instead, the PCA for the track pitch
The recording capacity can be increased by setting the read, write, and write areas with sufficient margins in the area, the PMA area, and the lead-in area, and reducing the size in the program area.

FIG. 5 shows the distribution of track pitch and linear velocity in each area of the optical information recording medium having such a configuration. The solid line in FIG. 5 indicates the linear velocity, and the dotted line in FIG. 5 indicates the track pitch. The transition area of the track pitch is provided in the lead-in area and the lead-out area so that the track pitch does not change in the program area.

As described above, the optimum linear velocity for securing a sufficient recording capacity while keeping the linear velocity constant is 1.0 m / s or more for the above-mentioned reason. Further, the upper limit of the linear velocity is preferably 1.13 m / s or less in order to add useful commercial value to the 8 cm CD-R or CD-RW. In addition, as a result of experiments by the present inventors, it has been found that speed control becomes difficult when writing at high speed (especially about 20 times) when the speed is 1.16 m / s or more.

When the track pitch of the program area is reduced, for example, when recording is performed on a groove, it is preferable that the width of the groove be smaller than the width of the land.

In particular, when the track pitch is reduced, the crosstalk tends to deteriorate. In order to avoid the deterioration of crosstalk, by reducing the width of the groove, within the range where the light spot is irradiated,
It is possible to reduce the proportion occupied by pits formed in adjacent grooves. Therefore, the influence of pits formed in adjacent grooves is reduced, and crosstalk is reduced.

When the track pitch is 1.2 μm as described above.
In the case of not less than 1.3 μm, the width of the portion where the recording pit is formed is preferably 300 nm or more and 550 nm or less.
Note that the lower limit of 300 nm or more is the wavelength λ = 750.
The width is such that the presence or absence of a pit can be resolved even with an optical pickup having a nm and a numerical aperture NA = 0.45.

Note that this is not limited to the case of groove recording. In the case of land recording, a similar effect can be expected by reducing the land width. In the case of a CD-R in which the recording layer is formed of a dye, the degree of modulation during pit reproduction is also large.

The track pitch is set in the PCA area, PM
In the embodiment in which the track pitch is increased in the area A and the lead-in area, increasing the track pitch in these areas also has the following features.

By increasing the track pitch in the PCA area where the writing laser power calibration is performed, the focus in the PCA area can be easily adjusted, and the influence of the adjacent track can be reduced. Therefore, it becomes easy to select an appropriate laser power for the medium.

In the PMA area, the focus can be easily adjusted, and the write information in the program area written in the PMA area can be accurately read. Therefore, the reliability at the time of additional recording on the medium is improved.

Furthermore, as can be said for both the PCA area and the PMA area, the signals recorded in these areas have low jitter and block error rates,
3. Both I11 and Spec-in have a margin. Therefore, information recorded in the PCA area and the PMA area can be read with high accuracy, and a stable recording operation can be performed in the recording / reproducing apparatus.

In the case of a CD-R having a track pitch of 1.2 μm or more and 1.3 μm or less as in the first embodiment of the present invention, the conventional CD-R has a smaller track pitch. The optimum power is lower than -R. Therefore, it is preferable that the recommended power value recorded in the ATIP signal in the lead-in area is lower than the recommended power of the conventional CD-R. According to the experimental results of the present inventors, the preferable range of the recommended power is:
The laser power value at 1 × speed is 4.9 mW or more and 6.5 mW or less.

If the recommended power is set to be larger than 6.5 mW at the track pitch described above, pits will be formed on the land or groove where no recording is performed in the case of CD-R. Therefore, the block error rate increases. Furthermore, if the normal 7.2 mW is set to the recommended power value, the optimum power value is out of the power range that can be calibrated in the PCA region.

If the recommended power value is set to 4.9 mW or less, the formed pits will be too small, and good pits will not be formed. Since the optimum power is 7.2 mW formed at the conventional track pitch, the recommended power should be set low in advance at such a low level, and a meandering groove corresponding to the power value should be formed in the lead-in area in advance. The recording / playback device is
The optimum power can be reliably selected.

In recent years, CD-ROMs capable of high-speed recording and reproduction have been developed.
RW has been proposed. Particularly, a writing speed of about 4 to 10 times can be obtained. The one that stipulates this standard is Orange Book Part 3, Vol.2, Ver1.0. In this standard, as a difference from the conventional CD-RW,
There is a 30 second Time Jump in the PCA area. There is a part without an ATIP signal in the middle part of the PCA area. In the case where only the lead-in area introduced in the conventional technique is widened and the track pitch and linear velocity are reduced in order to increase the recording capacity in the other areas, the Time Jump portion is formed at a position different from the conventional one. Therefore, when performing test writing in the PCA area, there is a possibility that stable control may not be performed. However, such a problem does not occur in the present invention. Thus, an optical information recording medium having high versatility is obtained.

By the way, when the program area is narrowed, the influence of the eccentricity of the medium increases. Therefore, according to the findings of the present inventors, the PCA region, the PMA region
When the program area is made narrower than the area and the lead-in area, the eccentricity is preferably set to 30 μm or less.

When manufacturing a master of such a disk, processing corresponding to grooves and pre-pits is performed by a laser cutting machine or the like. In these processing machines, processing is performed by moving a table for fixing the master. 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 a table moving method is applied to form a highly accurate track pitch, the driving circuit for driving the table is not a conventional method of inputting a signal related to the track pitch only once. It is necessary to provide control means for detecting a position at a position in the radial direction, inputting a signal of the track pitch in accordance with the position, and inputting a signal of the track pitch to the position in the radial direction as needed. .

Next, FIG. 6 shows a method of manufacturing a stamper applicable to the optical information recording media of the first to third embodiments of the present invention. A description will be given with reference to FIG.

As a substrate material, blue plate glass is processed into a donut-shaped disk to obtain a substrate 3. Thereafter, the substrate surface is precisely polished to a surface roughness: Ra = 1 nm or less. After the cleaning, a primer and a photoresist 4 are spin-coated on the substrate surface in this order. When prebaked, a photoresist layer 4 having a thickness of about 200 nm is formed on each substrate 3 (1).

Next, using a laser cutting device,
The photoresist 4 on the substrate 3 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 4 on the substrate 3 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 3a is set in a sputtering apparatus, and a Ni layer 5 (conductive layer) is adhered on the surface.
Turn on. This completes the conductivity treatment. Then, by conducting electricity, Ni electroforming is performed to obtain a Ni plating layer 5 having a predetermined thickness (3). Then, when the Ni plating layer 5 is peeled off from the master 3a, a first mold 5a 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 molding die 5a 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 5a, the inner diameter and the outer diameter are punched out and dropped. Thus, a donut-shaped first molding die 5a is completed.

The master 3a after peeling off the first mold 5a is not damaged. Therefore, after cleaning the master 3a,
By performing this step again, a plurality of first molds 5a can be obtained. When a stainless steel substrate is bonded to the back surface of the first mold 5a with an epoxy adhesive, the planarity of the first mold 5a 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 7 is prepared. Then, the disc is washed, and a silane coupling agent as a primer is applied to the surface, and then baked. Then, the resin liquid is dropped on the first mold 5a having the uneven surface facing upward. Then, the glass disk 7 is pressed from above, and the resin liquid 6 is sandwiched between the glass disk 7 and the first molding die 5a. At this time, care was taken to prevent bubbles from entering the resin liquid 6. Further, the glass disk 7 is pressed to uniformly spread the viscous resin liquid 6 over the entire surface of the first mold 5a.

The resin liquid 6 is irradiated with ultraviolet rays from a mercury lamp through the glass disk 7. As a result, the resin liquid is hardened to form the second mold 6a made of a hard resin layer (5). Next, the second mold 6a is separated from the first mold 5a. The second mold 6a has an integral structure with the glass disk 7 as the base (6).

The first mold 5a left after peeling is
Since it is not damaged, it can be used repeatedly. Therefore,
Many second molding dies 6a can be formed from one first molding die 5a. The manufacture of the second mold 6a is easy, and 15 to 6
One sheet can be manufactured in 0 minutes.

Next, a third molding die (“metal stamper”) made of metal is formed based on the second molding die 6a. The manufacturing method is the same as the method for manufacturing the first mold 5a. That is, the second mold 6a is set in a sputtering apparatus, and a Ni layer 8 (conductive layer) is adhered on the surface.
sition. This completes the conductivity treatment. Then, by energizing, Ni electroforming is performed, and N
An i-plated layer 8 is obtained (7). Then, when the Ni plating layer 8 is peeled off from the second mold 6a, a third mold 8a is obtained (8).

A protective paint (for example, trade name: KLINCOAT S (manufactured by Fine Chemical Japan)) is applied to the uneven surface of the third mold 8a 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 8a, the inner and outer diameters are punched out and dropped. Thus, the donut-shaped third molding die 8a is completed. This third mold is used as a stamper for actually manufacturing a disk.

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

As described above, in the case of the optical information recording medium in which the track pitch is narrowed in the program area, the eccentricity must be 30 μm or less. To satisfy this eccentricity, the eccentricity of the stamper is required. Has to be found below 10 μm in our experiments. Therefore, when manufacturing the stamper, it is preferable to set the eccentricity to 10 μm or less.

By the way, as a result of the earnest study of the present inventors,
By setting conditions in at least the following ranges in the program area, writing to the program area by a recording device based on the CD-R and CD-RW standards and reading of information recorded in the program region by a reproduction device And it is possible to obtain a higher recording capacity than conventional CD-R and CD-RW.

The conditions are that the track pitch of the program area is 1.2 μm or more and less than 1.3 μm, and the linear velocity of the program area is 1.0 or more and less than 1.13 μm. In particular, this range is defined as a CD with a diameter of 8 cm.
By applying to -R and CD-RW, 8cmCD-
The use value of R / RW can be greatly improved.

When the track pitch is less than 1.2 μm, the wavelength λ is around 780 nm, and the numerical aperture NA is
In a recording apparatus and a reproducing apparatus having an optical pickup of 0.45, if the track pitch is 1.1 μm or more, the peak-to-peak value (push-pull signal) obtained when the optical pickup crosses the track will be the value of the groove. Compared to a signal obtained from a non-mirror surface portion, it is obtained to the extent that tracking can be sufficiently performed.

Therefore, the track pitch is 1.1 μm
With the above, tracking becomes possible, so that recording and reproduction can be performed for a while. However, as described above, the productivity of compact discs including CD-Rs and CD-RWs is reduced. Therefore, the commercial value of CD-Rs and CD-RWs whose prices have been reduced is reduced.
On the other hand, the present inventors have conducted intensive studies and found that the conventional C
In order to obtain the same productivity as that of DR and CD-RW and to achieve high-density recording, the track pitch must be 1.2 μm.
It has been found that the above is preferable.

According to a preferred embodiment of the present invention, the track pitch is less than 1.3 μm. The reason for this is that, as described in the first embodiment, tracking can be performed even if tracking is performed using a three-beam system, which is now rare.

According to the present invention, the linear velocity is 1.0 m
/ S or more. Set the track pitch to 1.
When the track pitch is 0.90 μm or more, in a recording apparatus and a reproducing apparatus having an optical pickup having a wavelength λ = approximately 780 nm and a numerical aperture NA = 0.45 below 0 μm, the minimum mark is smaller than the resolution of the optical pickup. Does not get smaller. Therefore, the minimum mark can be read by a conventional reproducing apparatus.
And I11 fall within the range of 0.3 to 0.6, the jitter is 35 ns or less, and the block error rate is 50 or less.
It was found that reproduction was possible if the linear velocity was 1.0 m / s.

This is because, if the linear velocity is set too low, the rotational speed becomes lower than the lower limit value of the motor that can rotate stably, especially during recording or reproduction of the outer program area. Therefore, in the case of a CD-R / RW having a diameter of 8 cm, if the linear velocity is 1.0 m / s, the rotational velocity in the outer program area is within the rotational velocity of the motor that can rotate stably, so that jitter and the like can be reduced. It is considered that the characteristics do not deteriorate.

Next, according to the knowledge of the present inventors, the upper limit of the linear velocity is preferably set to 1.13 μm or less. 1.13 μm, 8 cm diameter CD-R
The recording time at / RW can be set to 30 minutes or more. Incidentally, the format at that time is a CD digital audio format (sampling frequency 44.1k).
Hz, quantization 16 bits, 2 channels (right and left)
This is the case when recording was made. When recorded in the CD-ROM format, that is, in the ISO9660Mode-1 format, the size is 265 MB or more.

By the way, most of consumer applications that record data on a CD-R / RW disc use only half of the data capacity of the current 80 minutes (700 MB) of a CD-R disc. It is the current situation. The reason is that the software itself does not require such a large capacity, and the portable information terminal such as a notebook personal computer or a mobile uses a large capacity, which is rather inconvenient.

Therefore, the present inventors have already standardized the size of the CD-R / RW media so that the CD-R / RW, which has become popular, can obtain necessary and sufficient capacity even with a smaller media. Select a medium with a size of 8 cm,
As a result of diligent study of the capacity that does not actually cause a problem, 265
An attempt was made to develop an 8 cm CD-R / RW having a size of MB or more, and the present invention was achieved.

As a use of a CD-R / RW optical information recording medium for consumer use, image recording and music data recording are popular. By the way, in the case of digital video which is now widespread, one hour recording is common. The recording capacity used at this time is 300 MB. Also, M
The required capacity of one hour of moving images by PEG4 is also 300MB
It is. Therefore, a compact medium of 8 cm CD-R
By setting / RW so that the track pitch and the linear velocity become the above, it is possible to have substantially the same recording capacity. Therefore, it can be used as a digital video recording medium.

This medium can be reproduced by a widely used recording / reproducing apparatus equipped with an optical pickup having a wavelength λ = 780 nm and a numerical aperture NA = 0.45, so that its utility value is improved. To obtain a recording capacity equivalent to that of a digital video tape, about 300 MB is required, which is 34 minutes in the above-mentioned CD digital audio format. Therefore, it is preferable that the time is 34 minutes or more. However, in the case of 8 cm CD-R / RW,
If the time is longer than 40 minutes, the track pitch or the linear velocity becomes too large to record / reproduce. Therefore, the time is preferably 40 minutes or less.

As described above, according to the present invention, an 8 cm CD-R which is more compact than the widely spread 12 cm CD-R / RW and has a recording capacity equivalent to that of a digital video tape.
R / RW can be obtained.

That is, for an optical information recording medium having a diameter of 8 cm, when the track pitch and the linear velocity are set so that the recording time is from 33 minutes to 40 minutes, the push-pull signal and the reproduced signal of the formed pits 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.

[0202] Recording and reproduction are possible with an optical information recording medium having a longer recording time, but compared with an optical information recording medium having a recording time longer than this range,
A stable and good signal can be obtained.

Note that the track pitch of the program area is 1.2 μm or more and 1.3 μm or less, and the linear velocity is 1.0 m / s.
When the speed is less than 1.13 m / s, the minimum mark can be resolved by a conventional reproducing apparatus, and high-density recording / reproducing can be performed. Therefore, not only a writable medium such as CD-R or CD-RW but also The basic technical idea of the present invention may be applied to a reproduction-only CD or the like.

In this specification, the PCA area, PMA
By making the track pitch and linear distance of the area and the lead-in area larger than those of the program area and the lead-out area, in addition to the invention capable of reliably recognizing the optical information recording medium,
An invention for achieving stable and reliable recording on an optical information recording medium is also disclosed. For example, an optical information recording medium in which the track pitch and the linear velocity in the PCA area are larger than those in other areas, the track pitch and the linear velocity in the PMA area are larger than those in other areas, and both the PCA area and the PMA area are different. This is an invention of an optical information recording medium having an area larger than other areas.

According to these inventions, the recording capacity is improved by setting the track pitch and the linear velocity in the PCA area to the same values as those of the conventional CD-R, and reducing the track pitch and the linear velocity in other areas. PCA
Power calibration of laser light performed in the region can be performed accurately. Therefore, the quality of marks written in other areas is improved.

Further, by making the track pitch and the linear velocity of the PMA area the same as those of the PCA area described above, it becomes possible to perform recording and reproduction in the PMA area satisfactorily. In particular, since the used program area is recorded in the PMA area, and the power calibration measured for the first time is recorded, it is necessary to accurately reproduce the second and subsequent times. By increasing the track pitch and linear velocity so that such an area can be accurately reproduced, more secure and accurate writing can be performed.

An optical information recording medium that can be recorded and reproduced by a recording / reproducing apparatus capable of recording and reproducing in a format slightly different from the standard of the current compact disk or DVD, at least a PC
It is necessary to increase the track pitch and linear velocity of the A area or the PMA area so that recording and reproduction can be performed on these areas satisfactorily. Therefore, the present invention is also very effective for such an optical information recording medium.

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.

[0209]

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. (Embodiment 1) Groove recording type CD-ROM according to the present invention
An R disk was manufactured. First, outer diameter 200mm, thickness 6
After preparing a precision-cleaned glass master having a thickness of 1 mm, a primer was applied to the surface of the master and a positive photoresist (S1818, manufactured by Shipley) was spin-coated and prebaked on a hot plate at 100 ° C. for 10 minutes. By this process, a coating master having a coating thickness of 180 nm was completed.

Next, a wobbled groove is formed on the coating master by a laser cutting machine. This step is the most important point in the present invention. First, Orange Book Standard 2 which is a CD-R format
According to the Version 3.1 standard, the mastering generator Da3080 made by Kenwood has a lead-in start time of 97:00:00 and a lead-out start time (last possible start time of lead-out area) of 30:10:00. Set.

The exposure start position is 22.0 mm in radius and 22.0 mm in radius.
In the area from to 25.00mm, the track pitch is 1.60μm,
Set the linear velocity as 1.20m / s, radius 25.00-25.10mm
In between, only track pitch from 1.60μm to 1μ in radial direction
Laser cutting was performed at a rate of 0.004 μm with respect to m while decreasing by a fixed amount, and a track pitch was set to 1.20 μm at a radius of 25.10 mm.

When the laser position reached the radial position of 39.10 mm, the laser cutting was completed.

Then, development was performed with an inorganic alkali developer (developer made by Shipley) and a diluent in ultrapure water at a concentration of 20% to complete a master master. Next, subjected to a conductive treatment, after electroforming by a technotrans nickel electroforming apparatus, peeled off from the glass master, further 34.00 mm inner diameter, 138.00 m outer diameter
The diameter of m was punched out to complete the nickel stamper.

The stamper was manufactured by Sumitomo Heavy Industries, Ltd.
It was set in a D40 alpha injection molding apparatus, a polycarbonate substrate was produced, and a Ciba Super Green Dye was applied by spin coating using a stamper of the present invention by a CD-R production line (manufactured by Singulars), and a reflective film and a lacquer were further applied. A blank CD-R blank disc was completed.

[0215] This blank disk was inserted into a Sanyo Electric CD-R.
When recording was performed under drive conditions of 12 × speed, a total of 30 minutes and 10 seconds could be recorded without any error.

[0216] The disc is set on a CD-CATS device manufactured by Audio Deployment Co., Ltd., and SLD (Start L
ead in Diameter) and SPD (Start Program Diameter)
Was measured, SLD = 45.92 mm, SPD = 49.5 mm
It was able to satisfy the Orange Book standard. As described above, a CD-R disc satisfying the Orange Book standard and capable of recording for a long time could be produced. (Example 2) In the same manner as in Example 1, C
A DR disk was manufactured. The lead-in start time was set to 97:00:00, and the lead-out start time (last possible start time of the lead-out area) was set to 30: 10: 0, and the mastering generator Da3080 made by Kenwood was set.

The exposure start position is 22.0 mm in radius and 22.0 mm in radius.
In the area from to 24.95mm, the track pitch is 1.60μm,
Set the linear velocity as 1.20m / s, radius 24.95-25.00mm
In between, only track pitch from 1.60μm to 1μ in radial direction
Laser cutting was performed at a rate of 0.004 μm with respect to m while decreasing the amount by a constant amount, and the track pitch was set to 1.20 μm at a radius of 25.00 mm.

That is, in the present embodiment, the track pitch at the end of the lead-in area is gradually changed at the above ratio. And the radius position 39.10mm as it is
The laser cutting was terminated when reaching.

[0219] This blank disc was inserted into a Sanyo Electric CD-R.
When the recording was performed by a drive and the recording was performed under the recording speed of 12 times, the recording was performed for a total of 30 minutes and 10 seconds without any error.

[0220] The disc is set on a CD-CATS device manufactured by Audio Deployment Co., Ltd. for SLD and SP.
When D was measured, SLD = 45.92 mm, SPD = 49.0 m
m, satisfying the Orange Book standard.
As described above, a CD-R disc satisfying the Orange Book standard and capable of recording for a long time could be produced. Example 3 A CD-R disk was manufactured in the same manner as in Example 1. 97: 0 lead-in start time
At 0:00, the lead-out start time (last possible start time of the lead-out area) was set to 30:10:00 and the mastering generator Da3080 made by Kenwood was set.

The exposure start position is 22.0 mm in radius and 22.0 mm in radius.
In the area from to 25.00mm, the track pitch is 1.60μm,
Set the linear velocity as 1.20m / s, radius 24.95-25.00mm
During this period, laser cutting was performed while reducing the linear velocity only from 1.20 m / s at a constant speed, and the radius was 25.00 m.
At the time point m, the linear velocity was set to be 1.00 m / s.
That is, the track pitch at the end of the lead-in area was maintained as it was, and the laser cutting was terminated when the radial position reached 39.10 mm.

[0222] This blank disk was inserted into a Sanyo Electric CD-R.
When recording was performed under drive conditions of 12 × speed, the recording was completed for a total of 30 minutes and 10 seconds without any error.

[0223] The disc is set on a CD-CATS device manufactured by Audio Deployment Co., Ltd.
When D was measured, SLD = 45.92 mm, SPD = 49.0 m
m, satisfying the Orange Book standard.
As described above, a CD-R disc satisfying the Orange Book standard and capable of recording for a long time could be produced. Example 4 A CD-R disk was manufactured in the same manner as in Example 1. The size of the optical disk is 8 cm.
Groove start and ATIP start radius 21 mm, groove end and ATIP end position 39 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 / 40:10:00, the track pitch from the groove start position to the lead-in start position is 1.52 μm, the linear velocity is 1.2 m / s, and the track pitch in the lead-in area is
1.52 μm, linear velocity 1.2 m / s, track pitch in program area 1.10 μm, linear velocity 0.95 m / s, track pitch in lead-out area 1.10 μm, linear velocity 0.95 m
/ S. The track pitch and the linear velocity were changed at a fixed rate from the position of a radius of 24.5 mm in the lead-in area so that the track pitch and the linear velocity of the program area became the end point of the lead-in area.

This long-time CD-R was 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 long-time large-capacity recording data of 40 minutes (350 MB), which is 17 minutes longer than the conventional 23-minute limit time. Marks formed in the program area were detected, but performance such as jitter was somewhat poor.

This characteristic was maintained from 1 × speed to 12 × speed writing. However, Pulstec DDU10
In the case of the 16 × speed writing and the 20 × speed writing by 00, it was found that an error occurred at the time of reading in about 5% of the disks. Example 5 A CD-R disk was manufactured in the same manner as in Example 1. The size of the optical disk is 8 cm. Groove start and ATIP start radius 21 mm, groove end and ATIP end position 39.1 mm, lead-in area start time 97:27:00, program area start time 0
0:00:00, lead-out area start time 34:
02:00, the track pitch from the groove start position to the lead-in start position is 1.50 μm, the linear velocity is 1.11 m / s,
The track pitch in the lead-in area is 1.50 μm and the linear velocity is
1.11m / s, track pitch of program area is 1.23μm
The linear velocity is 1.11 m / s, the track pitch in the lead-out area is 1.23 μm, and the linear velocity is 1.11 m / s.

The track pitch was changed at a fixed rate from the position of a radius of 24.5 mm in the lead-in area so that the track pitch and the linear velocity of the program area became the end point of the lead-in area.

The long-time CD-R was 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). As a result, the lead-in start radius was 22.97mm and there was no problem, and the program start radius was 24.81mm.

Also, compared with the conventional 23-minute limit time,
Despite the long-time large-capacity recording data of 34 minutes (298 MB), which is as long as one minute, both the land jitter and the pit jitter were as low as about 20 nsec. In addition, pit deviation and land deviation are both spec-in and I3
Both I11 and I11 were spec-in and had a reflectance of 71%.

Further, a low BLER was obtained, the push-pull signal was satisfactory, and the tracking was good. This characteristic was maintained from 1 × to 12 × writing. Further, it was confirmed that there was no problem in 16 × speed writing and 20 × speed writing by the Pulse Tech DDU1000, and the performance was maintained. Example 6 A CD-R disk was manufactured in the same manner as in Example 1. The size of the optical disk is 8 cm. Groove start and ATIP start radius 21 mm, groove end and ATIP end position 39.1 mm, lead-in area start time 97:27:00, program area start time 0
0:00:00, lead-out area start time 34:
At 07:00, the track pitch from the groove start position to the lead-in start position was 1.50 μm, the linear velocity was 1.16 m / s,
The track pitch in the lead-in area is 1.50 μm, the linear velocity is 1.16 m / s, and the track pitch in the program area is 1.18 μm
m, the linear velocity is 1.16 m / s, the track pitch in the lead-out area is 1.18 μm, and the linear velocity is 1.16 m / s.

The track pitch was changed at a constant rate from the position of a radius of 24.6 mm in the lead-in area so that the track pitch and the linear velocity of the program area became the end point of the lead-in area.

This long-time CD-R was 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). As a result, the lead-in start radius was 22.99mm and there was no problem, and the program start radius was 24.84mm.

In addition, compared to the conventional 23 minute time limit,
Despite the long-time, large-capacity recording data of 34 minutes (298 MB), which is as long as one minute, both the land jitter and the pit jitter were as low as about 18 nsec. In addition, pit deviation and land deviation are both spec-in and I3
Both I11 and I11 were spec-in and had a reflectance of 72%. Further, a low BLER was obtained, the push-pull signal was not a problem, and the tracking was good.

This characteristic was maintained from 1 × speed to 12 × speed writing. Further, it was confirmed that there was no problem with 16-times writing by the Pulse Tech DDU1000, and that the performance was maintained. However, the productivity during the injection molding of the plastic substrate was inferior to that of the first embodiment.

[0234]

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, even if the recording capacity of the program area is increased, stable and reliable optical writing on the optical information recording medium can be performed.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a physical format of an optical information recording medium according to a first embodiment of the present invention.

FIG. 2 is a diagram showing an arrangement of recording areas of a CD-R according to each embodiment of the present invention and a distribution of a track pitch or a linear velocity in each area.

FIG. 3 is a schematic configuration diagram of a physical format of an optical information recording medium according to a second embodiment of the present invention.

FIG. 4 is a schematic configuration diagram of a physical format of an optical information recording medium according to a third embodiment of the present invention.

FIG. 5 is a diagram showing an arrangement of recording areas of a CD-R according to a preferred embodiment of the present invention and a distribution of a track pitch or a linear velocity in each area.

FIG. 6 is a diagram showing a method of manufacturing a stamper which is an example of an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Optical information recording medium 2 ... Pregroove 3 ... Substrate 3a ... Master 4 ... Photoresist layer 5 ... Ni layer 5a ... 1st molding die 6 ... Resin liquid 6a ... 2nd molding die 7 ... Base (glass disk) 8 ... Ni layer 8a ... third mold A, B, C, D ... transition region

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme court ゛ (Reference) G11B 7/26 511 G11B 7/26 511 (72) Inventor Hiroshi Konishi 3-2-2, Marunouchi, Chiyoda-ku, Tokyo No. F term in Nikon Corporation (reference) 5D029 WB11 WC01 WD10 5D090 AA01 DD02 FF11 GG03 GG05 5D121 CA06 CB03

Claims (37)

[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. In those having a PMA area, a lead-in area, a program area, and a lead-out area, the track pitch of the program area is narrower than the track pitch of the PCA area, the PMA area, and the lead-in area. An optical information recording medium characterized in that the pitch is gradually changing. 2. 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. In those having a PMA area, a lead-in area, a program area, and a lead-out area, the track pitch of the program area is narrower than the track pitch of the PCA area, the PMA area, and the lead-in area. An optical information recording medium, characterized in that the track pitch gradually changes in the inside area of the lead-in area, and the change of the track pitch ends in the lead-in area. 3. The optical information recording medium according to claim 1, wherein the track pitch of the lead-out area is narrower than the track pitch of the program area, and the track pitch is in a transition area of the track pitch. An optical information recording medium characterized by the fact that is gradually changing. 4. One of claims 1 to 3
3. The optical information recording medium according to claim 1, wherein a linear velocity of the PCA area is the same as a linear velocity of the program area. 5. One of claims 1 to 4
The optical information recording medium according to claim 1, wherein a width of a groove or a land of the program area where the information is recorded or recorded is smaller than a width of a land or the groove where the information is not recorded. Optical information recording medium. 6. One of claims 1 to 5
The optical information recording medium according to claim 1, wherein a track pitch of the program area is 1.2 μm or more and less than 1.3 μm. 7. The optical information recording medium according to claim 6, wherein the eccentricity of each groove or land of the optical information recording medium is 30 μm or less. 8. One of claims 1 to 7
The optical information recording medium according to claim 1, wherein the linear velocity of the program area is 1.0 m / s or more. 9. 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 sequentially arranged from an inner periphery to an outer periphery. In those having a PMA area, a lead-in area, a program area, and a lead-out area, the track pitch of the lead-out area is narrower than the track pitch of the PCA area, the PMA area, the lead-in area, and the program area, and the transition area of the track pitch Wherein the track pitch is gradually changed. 10. 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. In those having a PMA area, a lead-in area, a program area, and a lead-out area, the linear velocity in the program area is made slower than the linear velocity in the PCA area, the PMA area, and the lead-in area. An optical information recording medium characterized by the fact that is gradually changing. 11. 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 sequentially arranged from an inner periphery to an outer periphery. In those having a PMA area, a lead-in area, a program area, and a lead-out area, the linear velocity in the program area is made slower than the linear velocity in the PCA area, the PMA area, and the lead-in area. An optical information recording medium, wherein the linear velocity gradually changes in an inner part of the area, and the change in the linear velocity ends in the lead-in area. 12. The optical information recording medium according to claim 10, wherein:
An optical information recording medium, wherein a linear velocity in a lead-out area is reduced. 13. A disc-shaped optical information recording medium for recording / reproducing information by means of a light beam tracked along a meandering groove or land. In those having a PMA area, a lead-in area, a program area, and a lead-out area, a PCA area, a PMA area, a lead-in area,
An optical information recording medium, wherein the linear velocity in the lead-out area is made slower than the linear velocity in the program area, and the linear velocity changes gradually in the transition area of the linear velocity. 14. The optical information recording medium according to claim 10, wherein a track pitch of the program area is narrower than a track pitch of the PCA area, the PMA area, and the lead-in area. An optical information recording medium characterized by being performed. 15. The optical information recording medium according to claim 14, wherein the track pitch of the lead-out area is smaller than the track pitch of the program area. 16. The optical information recording medium according to claim 10, wherein a lead-out area of the lead-out area is smaller than a track pitch of the PCA area, the PMA area, the lead-in area, and the program area. An optical information recording medium having a narrow track pitch. 17. The optical information recording medium according to claim 14, wherein a track pitch of the program area is not less than 1.2 μm and less than 1.3 μm. 18. The optical information recording medium according to claim 17, wherein the eccentricity of each groove or land of the optical information recording medium is 30 μm or less. 19. The optical information recording medium according to claim 10, wherein the linear velocity of the program area is 1.0 m / s or more. Information recording medium. 20. The optical information recording medium according to claim 9, wherein a groove or a land of the program area in which the information is recorded or in which the information is recorded has a width of: An optical information recording medium having a width smaller than a width of a land or a groove on which the information is not recorded. 21. The disc-shaped optical information recording medium according to claim 1, wherein the diameter of the optical information recording medium is 8 cm, and the maximum recording time is 30 to 30. An optical information recording medium for 40 minutes. 22. The optical information recording medium according to claim 21, wherein a track pitch of the program area is 1.2.
an optical information recording medium having a linear velocity of 1.0 m / s or more and 1.13 m / s or less, wherein the linear velocity of the program area is 1.0 m / s or more and less than 1.3 m; 23. 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. In one having a PMA area, a lead-in area, a program area, and a lead-out area, at least one of the track pitch and the linear velocity in the PCA area is made larger than other areas, and the track pitch or the linear velocity changes. An optical information recording medium characterized in that these change gradually in a transition region. 24. 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. In the apparatus having a PMA area, a lead-in area, a program area, and a lead-out area, at least one of the track pitch and the linear velocity in the PMA area is made larger than other areas, and the track pitch or the linear velocity changes. An optical information recording medium characterized in that these change gradually in a transition region. 25. 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 sequentially arranged from an inner periphery to an outer periphery. In one having a PMA area, a lead-in area, a program area, and a lead-out area, at least one of the track pitch or the linear velocity in both the PCA area and the PMA area is made larger than other areas, and An optical information recording medium characterized in that these gradually change in a transition region where the pitch or the linear velocity changes. 26. The optical information recording medium according to claim 1, wherein at least one of a track pitch and a linear velocity in the PCA area is larger than other areas. An optical information recording medium characterized in that these are gradually changed in a transition region where a track pitch or a linear velocity changes. 27. The optical information recording medium according to claim 1, wherein at least one of a track pitch and a linear velocity in the PMA area is larger than in other areas. An optical information recording medium characterized in that these are gradually changed in a transition region where a track pitch or a linear velocity changes. 28. The optical information recording medium according to claim 1, wherein at least one of a track pitch and a linear velocity is different in both the PCA area and the PMA area. An optical information recording medium characterized in that these are gradually changed in a transition area in which the track pitch or the linear velocity changes, which is made larger than that of the above-mentioned area. 29. A disc-shaped optical information recording medium, comprising a PCA area, a PMA area,
In those having a lead-in area, a program area, and a lead-out area, the track pitch of the program area is narrower than the track pitch of the PCA area, the PMA area, and the lead-in area, and the track pitch is gradually increased in the transition area of the track pitch. An optical information recording medium characterized in that the optical information recording medium is changed to: 30. A disc-shaped optical information recording medium, comprising a PCA area, a PMA area,
In those having a lead-in area, a program area, and a lead-out area, the track pitch of the lead-out area is smaller than the track pitch of the program area, and in the transition area of the track pitch, the track pitch gradually changes. An optical information recording medium characterized in that: 31. A disc-shaped optical information recording medium, comprising a PCA area, a PMA area,
In those having a lead-in area, a program area, and a lead-out area, the linear velocity in the program area is made smaller than the linear velocity in the PCA area, the PMA area, and the lead-in area, and in the transition area of the linear velocity, the linear velocity gradually decreases. An optical information recording medium characterized in that the optical information recording medium is changed to: 32. A disc-shaped optical information recording medium comprising: a PCA area, a PMA area,
In those having a lead-in area, a program area, and a lead-out area, the linear velocity in the lead-out area is smaller than the linear velocity in the program area, and the linear velocity is gradually changing in the transition area of the linear velocity. An optical information recording medium characterized by the above-mentioned. 33. The optical information recording medium according to claim 29, wherein a track pitch of the program area is not less than 1.2 μm and less than 1.3 μm. 34. A linear velocity of the program area is 1.Om/s.
Claims 29 to 33 characterized by the above.
An optical information recording medium according to claim 1. 35. A stamper having a convex portion corresponding to the concave portion and a concave portion corresponding to the convex portion formed on the optical recording medium according to any one of claims 1 to 34. 36. The stamper according to claim 35, wherein an amount of eccentricity of a concave portion or a convex portion formed in the stamper is 10 μm or less. 37. The method of manufacturing a stamper according to claim 35, wherein a step of preparing a first metal mold is performed, and a step of forming a second resin mold from the first mold. A method for manufacturing a stamper, comprising: a forming step; and a step of forming a metal stamper as a third forming die from the second forming die.