WO2002037482A1

WO2002037482A1 - Optical information record medium and stamper

Info

Publication number: WO2002037482A1
Application number: PCT/JP2001/009550
Authority: WO
Inventors: Seiji Morita
Original assignee: Nikon Corporation
Priority date: 2000-11-06
Filing date: 2001-10-31
Publication date: 2002-05-10
Also published as: JP2002150753A; TW544675B; AU2002210987A1

Abstract

If the beginning is 78 min 59 sec frame 73, the ATIP does not vary even when the time record progresses by one frame, but when the time record progresses by two frames, it represents 78 min 59 sec frame 74. When the time record progresses by two frames more, the frame information is reset to cause carry-over. Along with it, second information causes carry-over, and the time record represents 79 min 00 sec frame 00. It means that every time the time record increases by two actual frames, frame information increases by one frame. Thus, the medium can be adapted to write/read of a double quantity of information. Therefore, an optical information record medium can exhibit its utmost performance even if a conventional recording apparatus or reproducing apparatus is used and has an increased recording capacity without violating the standard imposed on the optical information record medium.

Description

Description Optical information recording medium and stamper Technical field

The present invention relates to an optical information recording device represented by an optical disk, a CD-R, a CD-RW, a DVD-R, a DVD-RW, and the like, and a stamper for manufacturing the same. Background art

Optical information recording devices such as optical disks and magneto-optical disks have been widely used as data recording media and audio information recording media, but recently, in addition to these, CD-R, Ct) -RW DVD- R, DVD-RW, etc. are being used. In these optical information recording devices, changes in properties due to magnetism of fine marks such as pits attached to the surface of a disk-shaped recording medium or a film provided on the surface of a disk-shaped recording medium are considered. It is used as information and records information by using optical means.

Some of the meanings of the terms related to optical information recording devices of this type are as follows: JISX6261 Γ i30mm write-once optical disk cartridge, JIS6271 Γ 130mm rewritable optical disk Therefore, in this specification, the terms described therein are used with the meanings described therein unless otherwise specified.

In these optical information recording devices, a meandering group and a land are provided spirally and alternately, and information is usually written on the group. I have. The group and the land are used for position control in which the photodetector travels along the zone in which information is written, that is, for position detection for performing tracking. In other words, the intensity of the reflected light differs depending on whether the light is irradiated on the groove or the land, and the position controller receives the signal and controls the position of the photodetector. Control is performed so that the position where the information is written is accurately irradiated with light.

Among these optical information recording devices, CD-R, CD-RW, etc., have a standard called orange book, and according to the standard, a disc-shaped optical information recording medium (hereinafter simply referred to as “ From the inner circumference to the outer circumference, the PCA (Power calibration area) area, PMA (Program memory area) area, Lead-in area, Program area, and Lead-out area Is to be provided. PCA is an area for trial recording by a recording drive, and PMA is an area for recording the memory usage status of the optical information recording medium.

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

By the way, meandering pre-groups are formed on CD-R and CD-RW. The pre-group is meandered, based on a signal obtained by combining a reference signal having a predetermined frequency and the pre-format information. The recording device demodulates the amount of reflected light from the pre-group, and performs recording and reproduction based on the obtained pre-format information. Ma The pre-group is formed continuously in a PCA area, a PMA area, a lead-in area, a program area, and a read-out area provided in each area of the CD-R and the CD-RW.

It should be noted that the PCA area is about 22 seconds and 40 frames long, and the PMA area is about 13 seconds and 25 frames long. CD-R and CD-RW are formed such that the length of the lead-in area is within the standard while ensuring this length.

The start radius of the lead-in area and the start radius of the program area are determined at predetermined positions, and the start time of the lead-in area is also a manufacturer identification code (M—code), and the recording method (write strategy) is determined. Since it is a sign (T-code), it cannot be changed arbitrarily by the manufacturer. The program area start time is also determined by the standard. The size of the lead-out area is also stipulated to be 1 minute and 30 seconds or more in terms of recording time. In such an optical information recording medium, it is possible to increase the recording density of information by reducing the track pitch as much as possible and by decreasing the linear velocity (m / s) used for recording and reproducing information. However, a large amount of information can be recorded on the same optical information recording medium, which is preferable. Also, it is preferable that the program area can be made as large as possible, because a lot of information can be similarly recorded on the same optical information recording medium.

Among them, as a technique corresponding to the former, Japanese Patent Application Laid-Open No. H10-222874 discloses a technique of reducing a track pitch in a program area or increasing a recording linear density (corresponding to a linear velocity). It has been disclosed. Generally, the resolution of a photodetector is determined by the wavelength of the light used and the numerical aperture (NA) of the optical system. Therefore, this technology uses shorter wavelengths and higher NAs (e = 635-685nm, NA = 0.6) than the wavelengths and numerical apertures (e = 780nm, NA-0.45) that are usually used, and increases the resolution. By raising the truck The pitch has been reduced and the recording linear density (corresponding to the linear velocity) has been increased, resulting in a larger recording capacity.

However, in the case of disks with simply reduced track pitch and linear velocity, when recording is performed with a recording device that uses short wavelengths and high NA and reduces the spot size, λ = 780 nm and NA = 0.45, which are commonly used, are used. There is a problem that reading cannot be performed by a reproducing apparatus having the above-mentioned photodetector. In other words, 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 disc type.

In addition, this method has another problem that comes from the orange book standard. That is, if the track pitch is simply reduced, it is difficult to include both the lead-in start radius and the program start radius within the standard.

In other words, in order to play the disc after recording without any problems with the current CD player or CD-ROM drive, and to record the disc before or after recording with the current CD-R / RW writer without any problems, read Since the in-start time information represents the manufacturer information and the write strategy information, the lead-in start time information cannot be changed in effect, and the time from the start of the lead-in to the start of the program is also changed because it is defined by the standard. Can not. Therefore, if the track pitch is set to a value less than Ι.δ ^ ιη in order to increase the recording information density, the lead-in start radius position or the program start radius position will be out of specification.

If you try to record on a disc that does not conform to this standard, the lead-in information may not be reproduced or may not be recorded due to erroneous reading, a recording error may occur, or data may not be recorded properly. Also, even if a non-standard disc can be recorded luckily, data cannot be read normally when playing the non-standard recorded disc, or it cannot be read at all. Will occur.

In the invention described in Japanese Patent Application Laid-Open No. H10-222,874, the track pitch and the recording linear density in the lead-in area are kept as they are, so that even when a conventional reproducing apparatus is used, the disc can be used. Types can be identified. However, even if the disc type can be identified by this method, information written in the program area by a recording device having a short wavelength, optical NA pickup cannot be read by a conventional recording device. Is no different.

Note that, in the invention described in Japanese Patent Application Laid-Open No. 10-2227084, as shown in the embodiment, in the PCA area, the PMA area, the program area, and the read-write area, track bite and The recording linear densities are the same, and these are changed only in the lead-in area. This is because the PCA area is an area for test recording with a recording drive, and the PMA is an area for recording the memory usage status of an optical information recording medium, so recording and playback are performed under the same conditions as the program area. It is based on the idea that it must be done and is inevitable for the invention.

As described above, increasing the recording capacity by recording using a recording device that uses a short wavelength and high NA and has a small spot size is a problem that conventional recording and playback devices cannot be used. Produces a point. Therefore, other possible methods, which are not known, are methods in which the track pitch is made as narrow as possible and the linear velocity is made as slow as possible within the allowable limits of the conventional recording and reproducing apparatus.

However, even if such other methods are adopted, there is a problem that the disc specification is not satisfied. In other words, according to the Orange Book standard, there is a problem that the maximum length of the program area is limited to 79 minutes 59 seconds 74 frames. That is, usually a program The start of the area is 00 minutes 00 seconds 00 frames, but according to the Orange Book standard, the lead-out area start time (last frame of the program area: last, possible start time, over time) Lead-out and area) are limited to a maximum of 79 minutes 59 seconds 74 frames.

This means that the time display part of the time code of ATIP (Absolute Time in Pre-groove) is two digits, and the 10th place is only the maximum 7 in the lead-in start time and the information is written in the lead-in area. Because they cannot do it. Therefore, the program area is limited to a maximum of 00: 00: 00: 00 frame to 79:59:79, 74 frames, that is, 79: 59: 59: 75 frames, and more Therefore, the program area cannot be increased in capacity and lengthened.

Also, even if the data is recorded in a readout area that is not normally used for writing, since the record recorded in that ATIP has exceeded the start time of the readout area, where is the disc It is difficult to know the end of the recordable position, and the data cannot be reliably recorded to the end, the data on the disc itself is destroyed, or the drive tries to record outside the disc area. The problem of destroying either the drive or the disk, or both

The present invention has been made in view of such circumstances, and while maximizing its capabilities while using conventional recording and reproducing devices, and violating the standards imposed on optical information recording media. Instead, it is an object to provide an optical information recording medium having an increased recording capacity and a stamper for manufacturing the optical information recording medium. A first invention for achieving the above object is a disc-shaped optical information recording medium that records and reproduces information by a light beam tracked along a meandering group or a land, and comprises: Toward the outer circumference side, in the case of sequentially having a PCA area, a PMA area, a lead-in area, a program area, and a read-word area, the time code information recorded in advance is increased by one frame for each of a plurality of real frames. An optical information recording medium characterized in that:

According to the standard, the data structure of one frame of ATIP is as shown in Fig. 1, and minutes, seconds, and frames are represented by 7 bits (1 bit out of 8 bits is fixed data). ing. Then, as shown in Fig. 2, the frame time increases by 1 each time one frame advances, increases by 1 second at 75 frames, and increases by 1 minute at 60 seconds. A TIP corresponding to the program area starts at frame 00:00:00 and ends with a maximum of frame 79:59:74. Therefore, the storage capacity is (80 X 60 X 75) frames. In the present invention, a change is made to the correspondence between AT IP data and actual frames. In other words, in the past, the ATIP data was increased by one frame every time one real frame progressed. However, in the present invention, the ATIP data is decremented every several real frames that are a predetermined number N. I am trying to increase the evening by one frame. Therefore, in relation to the data recorded in ATIP, (80 X 60 X 75) XN frames of data can be recorded. Therefore, the recording capacity can be increased even when there is a restriction due to ATIΡ.

The number of N may be two or more, but it is currently preferably two in relation to a possible physical recording density. That is, there is actually a lower limit of the track pitch depending on the wavelength of the optical pickup used conventionally and the NA of the objective lens. In addition, the lines used by writers and players Speed control also has a lower limit because the minimum recording mark may be too short or CLV control may not be applied.

Specifically, the lower limit of the track pitch is about 1.1 in and the linear velocity is about 0.9 m / sec. When converted from these, the current recordable capacity is limited to about 1.33 GB for 150 minutes. It is preferably 120 minutes or less and 1.05 GB or less, more preferably 99 minutes or less, and 866 MB is preferable in terms of reliability of overnight writing and reproduction. Considering these, at present, even if N is set to 3 or more, it is not advantageous, and it is preferable to set N to 2.

Note that “prerecorded time code information” is time code information recorded when an optical information recording medium is manufactured, and this information is usually obtained by making a group meander (uplink). Record In particular, the meandering cycle is changed according to the evening record information. This information is only used when writing information. At the same time as writing information, the address of the frame is recorded in advance as part of the information recorded in the frame of the program area. The time code information is written separately, and reading is controlled based on the information written in the frame. Thus, by incrementing the “pre-recorded time code information” for each of multiple frames, even if there are multiple frames with the same ATIP, the read control will not be disabled by that. .

A second invention for achieving the above object has a meandering group or land, wherein a time record is defined according to the meandering cycle of the meandering groove or land, and the meandering group or land is assigned to the meandering group or land. An optical information recording medium for performing upper recording and reproduction by a light beam tracked along, wherein the evening record is increased by one frame for every plural frames. An information recording medium.

The present invention is equivalent to the first invention, and is the same as the first invention. And the like.

A third invention for achieving the above object is the first invention or the second invention, wherein 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.

In the present invention, the track pitches of the PCA area, the PMA area, and the lead-in area are set to the levels used in conventional recording devices and playback devices, and the track pitch of the program area is determined by the track bit of these areas. Make it narrow. Of course, in this case, the track pitch must be such that a tracking error does not occur more than an allowable value even when applied to a conventional recording device or reproducing device.

When the track pitch is reduced over the entire surface of the disk, the above-described problem occurs. In the present invention, the track pitch of the PCA area, the PMA area, and the lead-in area is reduced by using the conventional recording apparatus and reproducing apparatus. The above-mentioned problem does not occur because it is used only for

ADVANTAGE OF THE INVENTION According to the present invention, the capacity can be maximized while using the conventional recording device and reproducing device, and the recording capacity is increased without violating the standard imposed on the disc. It can be an optical information recording medium. Further, since the first aspect of the invention is employed, even if the recording capacity is increased, the time record does not become incompatible.

Further, in the present invention, since the PCA area, PMA area, and lead-in area located in the inner peripheral portion have a relatively large track pitch as compared with the program area, a plastic resin such as polycarbonate is used during injection molding. It is easy to get into the meandering group pattern on the Cheap). Therefore, the transfer is reliably performed. This occurs because the resin is injected from the inner periphery. In addition, even when peeling, the mold release property of the inner peripheral part is particularly good, so that cloud is not easily generated, the inner diameter hole shape can be processed finely, and a substrate with less eccentricity can be manufactured.

A fourth invention for achieving the above object is the first invention or the second invention, wherein, in order from the inner periphery to the outer periphery, a PCA area, a PMA area, a lead-in area, a program area, In the one having a readout area, the track pitch of the program area and the readout area is narrower than the track pitch of the PCA area, the PMA area, and the lead-in area.

In the present invention, in addition to the program area, the track pitch of the lead-out area is narrower than the track pitch of the PCA area, the PMA area, and the lead-in area. By reducing the track pitch of the lead-out area, the program area can be expanded correspondingly, so that the storage capacity can be further increased.

A fifth invention for achieving the above object is the third invention or the fourth invention, wherein the linear velocity of the PCA area is the same as the linear velocity of the program area.

The PCA area is an area for test recording, and the PMA area is an area for recording the memory usage status of the optical information recording medium. In these areas, tracking can be performed reliably and sufficient It is desirable to be able to read and write with a margin and to perform calibration reliably. In the present invention, since the linear velocities in the PCA area and the program area are the same, the circumferential size of the marks recorded in both can be the same, and writing and reading can be performed under the same conditions. Can be performed more accurately. A sixth invention for achieving the above object is any one of the first invention to the third invention, wherein a PCA area, a PMA area, a lead-in area, In the one having 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.

In the present invention, the linear velocities of the PCA area, the PMA area, and the lead-in area are set to the levels used in the conventional recording apparatus and the reproducing apparatus, and the linear velocities of the program area and the lead-out area are set based on these. I try to slow it down.

If the linear velocity is reduced over the entire surface of the disc, the above-described problem occurs.In the present invention, the linear velocity in the PCA area, PMA area, and lead-in area is used in a conventional recording apparatus and reproducing apparatus. Therefore, the above-mentioned problem does not occur for the same reason as described in the second invention.

ADVANTAGE OF THE INVENTION According to the present invention, the capacity can be maximized while using the conventional recording device and reproducing device, and the recording capacity is increased without violating the standard imposed on the disc. It can be an optical information recording medium.

A seventh invention for achieving the above object is any one of the first invention to the third invention, wherein a PCA region, a PMA region, and a lead-in region are arranged in order from the inner periphery to the outer periphery. A program area and a lead-out area, wherein the linear velocity in the program area and the read-out area is lower than the linear velocity in the PCA area, the PMA area, and the lead-in area. It is.

In the present invention, in addition to the program area, the linear velocity of the readout area The speed is also lower than the linear velocity in the PCA area, PMA area, and lead-in area. By slowing down the track pitch in the lead-out area, the program area can be expanded accordingly, and the storage capacity can be further increased.

An eighth invention for achieving the above object is a disc-shaped optical information recording medium which records and reproduces information by a light beam tracked along a meandering groove or land. An optical information recording medium characterized in that the diameter of the optical information recording medium is 12 O mm and the program recording time is 90 to 120 minutes.

The optical system of currently used recording and reproducing devices has a wavelength of 780imi and NA = 0.45. According to experiments by the inventors, the minimum track pitch at which stable reading and writing can be performed using this device is about l.lm and the slowest linear velocity is about 0.9 ni. However, in the present invention, the track pitch is set to about 1.17 m and the linear velocity is set to about 1.0 m in view of a certain margin. From this, when the standard of the optical information recording medium having a diameter of 120 mm is considered, the maximum value of the recording time is 120 minutes. Therefore, in the present invention, the maximum value of the program recording time is set to 120 minutes. Further, since the conventional maximum value of the program storage time does not exceed 90 minutes even when various methods are used, the minimum value of the program recording time is limited to 90 minutes in the present invention. Such an optical information recording medium can be realized by the first to seventh inventions.

According to a ninth invention for achieving the above object, a convex portion corresponding to a concave portion formed on the optical information recording medium according to any one of the first to eighth inventions, a concave portion corresponding to the convex portion is provided. It is a stamper to have.

According to the present invention, the optical information storage medium according to the first to seventh aspects can be manufactured inexpensively and in large quantities by injection molding or the like. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a diagram showing a configuration of A TIP which is pre-recorded time code information.

FIG. 2 shows the change of the conventional A TIP information every time one frame progresses.

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

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

FIG. 5 is a diagram illustrating a method of manufacturing a sparkper as an example of an embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description of embodiments and examples, a recording device and a reproducing device using a light emitting and receiving device having a wavelength of 780 mn and a numerical aperture of about 0.45, which are currently most frequently used, may be described as an example. However, the present invention is not limited to such a recording apparatus and a reproducing apparatus, but can be used for a recording apparatus and a reproducing apparatus having different wavelengths and numerical apertures and therefore different resolutions. It can be used even if a standard that conforms to the specifications of such a recording device and playback device is established.

FIG. 1 is a diagram showing the structure of ATIP, which is time code information recorded in a meandering groove in advance. The first 4 bits are used for synchronization. Used as a Sync signal. The following 8 bits are used for BCD signals indicating minutes, seconds, and frames. (2 digits each). However, the maximum value of the second is 59, and the maximum value of the frame is 74. Then, the minute value takes a value from 0 to 79 in the program area. The last 14 bits are used as a CRC check bit. This ATIP information is usually recorded as a meandering signal of a group when the optical information recording medium is manufactured (more precisely, when a stamper is manufactured).

FIG. 2 shows the change of the conventional A TIP information every time one frame progresses. That is, the frame information is incremented by one every time one frame advances. If the beginning was 78 minutes 59 seconds 73 frames, going forward one frame would be 78 minutes 59 seconds 74 frames, and if going one frame further, the frame information would be reset and a carry would occur. , And the second information also carries a digit, resulting in 79 minutes 00 seconds 00 frames. FIG. 3 shows a change in the ATIP information every time one frame advances in an example of the embodiment of the present invention. In this embodiment, frame information is incremented by one every two frames.

At the beginning 分 8 minutes 5 9 seconds 7 If the frame is 3 frames, the ATIP does not change even if it advances 1 frame, and when it advances 2 frames, it becomes 7 8 minutes 5 9 seconds 7 4 frames, and further advances by 2 frames The frame information is reset to cause a carry, and at the same time, the second information also carries a carry, resulting in a 79 minute 00 second 00 frame.

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

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

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

In this way, it is possible to record twice as much dummy code data in the same program area as before. In addition, since the ATP specified by the Orange Book standard is used as it is, conventional ATP-R and C-D-W writer can perform ATP decoding, so there is no problem in compatibility. Of course, it is also possible to increment one frame every time the same frame is repeated three or four frames.

FIG. 4 is a diagram showing an example of an embodiment of the present invention, showing an arrangement of recording areas of {0-1 and 0-11} and a distribution of track pitch or linear velocity in each area.

In FIG. 4, (a) shows the arrangement of the recording area, and the non-recording area having no group from the center, the PCA area, the PMA area, the lead-in area, the program area, the lead-out area, and the non-group having no group. The order is the recording area. Each of these areas is manufactured to meet the Orange Book standards mentioned in the Background section. In a conventional recording device and reproducing device having a photodetector having a wavelength of 780 nm and NA = 0.45, the standard track pitch is 1.5 zm to 1.7 m. Therefore, in the present embodiment, the track pitch of the PCA area, the PMA area, and the lead-in area is set to a value within this range. Also, when the peak 'ヅ' beak value (push-pull signal) of the signal obtained when the photodetector traverses the track is greater than or equal to a predetermined ratio of the magnitude of the signal obtained from the mirror without group. However, tracking can be performed stably with conventional recording and reproducing devices.

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

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

(c) corresponds to the CD-R according to the first embodiment of the present invention, and the track pitch and linear velocity are almost the same as those of the conventional example in the PCA area, the PMA area, and the lead-in area (track pitch). Is 1.5 to 1.7 m, and the linear velocity is about 1.2 m / s). On the other hand, in the program area and the read-out area, at least one of the track pitch and linear velocity is smaller than that in the PCA area and PMA area (the track pitch is ll ^ m or more and less than 1.5 m, linear velocity Is 0.90m / s or less: less than L2m / s).

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

Further, in this embodiment, at least one of the track pitch and the linear velocity in the readout area is smaller than that of the conventional example, so that the readout area is within a range that satisfies the standard of the recording time of the readout area. The area occupied by the program area can be reduced, and that area can be used as a program area, so that the recording capacity of the program area can be increased. Needless to say, the present invention also includes those in which the track pitch and the linear velocity of the lead-out area are the same as those of the PCA area, the PMA area, and the lead-in area.

According to the results of experiments by the present inventors, a sufficient push-pull signal and a reproduced signal with sufficient characteristics can be obtained even with a conventional recording device or reproducing device using an optical system having a wavelength of 780 nm and a numerical aperture of about 0.45. In order to achieve this, it was found that it was necessary to set the track pitch to l.lm or more and the linear velocity to 0.90 m / s or more. Therefore, in the embodiment shown here and in the following embodiments, the narrowed track pitch and the reduced linear velocity are also in this range. Therefore, an optical information recording medium capable of recording and reproducing can be obtained simply by using a conventionally used recording device and reproducing device.

(d) corresponds to the CD-R according to the second embodiment of the present invention, and differs from (c) in that at least one of the track pitch and the linear velocity in the lead-out area is: It is even smaller than in the program area. As a result, the area occupied by the lead-out area can be further reduced within a range that satisfies the recording time standard of the lead-out area, and that part can be used as a program area. Therefore, the recording capacity of the program area can be increased.

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

When manufacturing a master of such a disc, processing corresponding to the group or pre-pit is performed by a laser cutting machine or the like, but the processing is performed by moving a table for fixing the master to these processing machines. There is a table moving type that performs a table movement, and a pick-up moving type that performs processing by moving a processing tool such as a laser. When changing the track pitch, the pick-up movement method has a faster response and better tracking accuracy, but the table movement method is superior in terms of machining accuracy of the entire disc, so use both as appropriate. Is preferred.

When the linear velocity of an optical information recording medium or a master of such a disc is reduced, the rotation direction of the medium is determined by the length of the formed pits or one cycle of the meandering amplitude of the pre-group that has been skipped. It is also possible to reduce the amount of time spent. Therefore, when forming a master disk of a disk having a wobble-shaped pre-group, the linear velocity can be reduced by shortening the length of the meandering amplitude used in one cycle.

Hereinafter, a method of manufacturing a stamper which is an example of an embodiment of the present invention will be described with reference to FIG. In Fig. 5, 1 is the substrate, la is the master, 2 is the photoresist layer, 3 is the Ni layer, 3a is the first mold, 4 is the resin liquid, 4a is the second mold, and 5 is the base (glass Disk), 6 is the Ni layer, 6a is the third mold You.

Blue glass is processed into a doughnut-shaped disk as a substrate material to obtain a substrate 1. Then, the substrate surface is precisely polished to a surface roughness: Ra = l nm or less. After washing, primer and photoresist 2 are sequentially applied to the substrate surface. Upon pre-baking, a photoresist layer 2 about 200 nm thick is formed on each substrate 1 (1).

Next, the photo resist 2 on the substrate 1 is exposed by using a laser power coating device. The pattern of exposure is a pattern corresponding to the groove and prepit of the optical information recording medium according to the present invention.

After the exposure, the resist 2 on the substrate 1 is developed with an inorganic alkali developer. Spin-clean the resist surface and post-bake. As a result, a resist pattern is formed (2).

Next, the master 1a is set in a sputtering apparatus, and a Ni layer 3 (conductive layer) is deposited on the surface. This completes the conductivity treatment. Then, the Ni current is applied by applying current to obtain the Ni plating layer 3 having a predetermined thickness (3). Then, by peeling off the Ni plating layer 3 from the master 1a, a first mold 3a is obtained (4).

A protective paint (for example, trade name: Cleancoat S (manufactured by Fine Chemical Japan)) is applied to the uneven surface of the first mold 3a by spin coating. After application, the coating is allowed to air dry. Thereby, the uneven surface is covered with the protective coat. After polishing the back surface of the first mold 3a, the inner and outer diameters are punched and dropped. Thus, a first mold 3a having a doughnut shape is completed.

The master 1a after peeling off the first mold 3a is not damaged. Then, after the master la is washed, this step is performed again to obtain a plurality of first molding dies 3a. Epoxy adhesive on the back of the first mold 3a When the stainless steel substrate is bonded by using the method, the flatness of the first mold 3a is improved. Next, an ultraviolet curable resin liquid is prepared. Considering heat and light absorption characteristics, mold release properties, light resistance, durability and hardness, the resin liquid has a color number (APHA) of 30 to 50 and a refractive index of 25 ° C. It is preferably about 4 to 1.8. The specific gravity of the resin liquid is preferably about 0.8 to 1.3 at 25, and about 10 to 480 CPS at 25 ° C. in terms of transferability.

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

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

The first mold 3a left after peeling is not damaged and can be used repeatedly. Therefore, many second molding dies 4a can be formed from one first molding die 3a. The production of the second mold 4a is easy, and one piece can be produced in 15 to 60 minutes.

Next, based on the second molding die 4a, a third molding die made of metal (a "metal stamper" according to claim 13) is formed. The manufacturing method is the same as that of the first molding die 3a. That is, the second molding die 4a is set in a sputtering device, and a Ni layer 6 (conductive layer) is deposited on the surface, thereby completing the conductive process. By energizing An Ni electrode is applied to obtain a Ni plating layer 6 having a predetermined thickness (7). Then, when the Ni plating layer 6 is peeled off from the second mold 4a, a third mold 6a is obtained (8).

A protective coating (for example, KLINCOAT S (manufactured by Fine Chemical Japan)) is applied to the uneven surface of the third mold 6a by spin coating. After application, the coating is allowed to air dry. As a result, the uneven surface is covered with the protective coat. After polishing the back surface of the third molding die 6a, the inner and outer diameters are punched out and dropped, thereby completing a donut-shaped third molding die 6a. Used as a stamper for manufacturing discs.

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

That is, for an optical information recording medium having a diameter of 120 mm, if the track pitch and the linear velocity are set so that the recording time is from 90 minutes to 120 minutes, the reproduction of the push-pull signal and the formed pit can be performed. The signal can be obtained with a margin even with a conventional recording device and reproducing device having a pickup with a wavelength of 780 mn and a number of openings of 0.45.

Recording and reproduction are possible even with an optical information recording medium having a longer recording time, but a stable and high quality signal can be obtained as compared with an optical information recording medium having a recording time longer than this range.

When the recording time is 90 minutes or more, 15 to 20 songs can be reliably recorded on an 80 mm disc. Then, it becomes possible to record more than 790 MB as digit information.

Note that the present invention is applicable to a device in which the position of the minimum recording unit is indicated by an evening record such as ATIP as described above. The present invention is applicable to an optical information recording medium in which the recording area of the optical information recording medium increases as a new area other than the above-described area. Example

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 disk and the laser of the present embodiment are each formed to conform to the standard. Note that since the optical disk can be used as an optical disk even if it exists between the start of the group and the start of the PCA area, the start area of the PCA area is not specified here.

(Example 1)

An optical disk according to the present invention was manufactured. The size of the optical disk is 120 mm. First, a stamper according to the present invention was manufactured. One important point was the laser boosting process. In this process of recording the group on the photo resist master, the ATI P conforming to CD-R and CD-format was recorded by groove wobbling.

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

Group start and ATIP start radius 2 lmni, Group end and ATIP end position 59 mm, lead-in area start time 97: 27: 00, Program area start time 00: 00: 00, readout area time

—Rate time (last 'possible' start time of 'lead-out area') 4 5: 3 0: 0 2, track pitch from groove start position to lead-in start position is 1.52〃m and linear velocity ( The track speed in the lead-in area is 1.52〃m and the linear velocity (at 1x speed) is 1.2m / s. The track pitch in the program area is 1.34〃m and the linear velocity (at 1x speed) is 1.5mZs. The track pitch in the 1.2 m / s read format area was 1.34 m and the linear velocity (at 1x speed) was 1.2 m / s. The program area is 45 minutes 30 seconds 0 2 frames, but the frame information increases by 1 second in 2 seconds (2 frames increase by 1 frame), so actually the frame area is 91 minutes 00 seconds 0 4 frames Up to the length.

After developing the photoresist master exposed under these conditions, the nickel conductive film is spun, and nickel electrolysis is performed, the nickel mask is peeled from the master, the photo resist is removed, cleaning is performed, a surface protective film is applied, and the back surface is polished. Then, coating of the backside protective film, punching of the inner and outer diameters, peeling of the both-sided protective film, and surface cleaning were performed in this order to produce a stamper. The stamper is set in an injection molding machine (SD40 Alpha manufactured by Sumitomo Heavy Industries), injection molded, and a large number of polycarbonate disc substrates are duplicated. Such a long-time CD-R was produced.

The dye is a phthalocyanine dye (Ciba Super Green), the solvent is DBE, the protective coat lacquer is a UV curable coating material (DSM), and the print ink applied on it is from Teikoku Ink. Data is recorded on this long-duration CD-R using a 1- to 12-times speed CD-R writer (manufactured by Plexter), and recording and playback is performed using a standard CD-R inspection device (CD-CATS manufactured by Audio Equipment). An evaluation was performed. As a result, the lead-in start radius was 22.95 mm, and there was no problem. It was 24.9mm without any problem.

In addition, I was able to record a long time of 91 minutes (796 MB). I tested both the Disk At Once mode and the Track At-Once mode, and both tested fine. In particular, in the track-up / dance mode, data can be additionally recorded, so that data can be recorded little by little on a disc, and the usability is very good.

This CD-R can record a large amount of data for a long time of 91 minutes (796 MB), which is 12 minutes longer than the conventional 79 minutes limit time. In the recording day, both the land and night jitters were low, about 20 nsec for both the land and the night, and both the pit and land developments were spec-in. Both I 3 and I 11 were spec-in and reflectivity was 71%, low B L ER was obtained, push-pull signal was no problem, and tracking was good. This characteristic was maintained from 1x to 12x writing. Further, it was confirmed that there was no problem with 16 × speed writing and 20 × speed writing with the pulse take DDU 1000, and the performance was maintained. (Example 2)

An optical disk according to the present invention was manufactured. Group start and AT IP start radius 21 mm, Group end and ATIP end position 59 mm, Lead-in area start time 97:27:00, Program area start time 00: 00: 00: 00, Lead-out Area start time 52:01 1:01, track pitch from groove start position to lead-in start position is 1.52 m, linear velocity (at 1x speed) is 1.2 mZs, and track bit in lead-in area is 1.52 m At 1 m, the linear velocity (at 1x speed) is 1.2 m / s, the track pitch in the program area is 1.17 m, the linear velocity (at 1x speed) is 1.2 m / s, and the track pitch in the lead-out area is 1.17 m. The linear velocity (at 1x speed) was 1.2 mZs. Blog The ram area is 5 2 minutes 0 1 second 0 1 frame, but the frame information increases by 1 second in 2 seconds (2 frames increase by 1 frame), so actually 104 minutes 0 2 seconds 0 2 frames Can correspond to the length.

Thereafter, a long-time CD-R according to the present invention was produced in the same steps as in Example 1. '

This long-time CD-; is recorded overnight by a 1- to 12-times speed CD-R writer (manufactured by Plex Yuichi), and the CD-R standard inspection equipment (CD-CATS manufactured by Audiodaibukimento) is used. Was used to evaluate recording and reproduction. This CD-R can record a long-time large-capacity recording of 104 minutes (910 MB), which is 25 minutes longer than the conventional 79 minutes limit time. However, the same results as in Example 1 were obtained as the test results. This property was maintained from 1x to 12x writing. Furthermore, it was confirmed that there was no problem with 16-speed writing and 20-times writing by the Pulstec DDU1000, and that the performance was maintained. In addition, it is necessary to superimpose and record the time code called subcode Q on the written information. The absolute time from the beginning of the program area and its data individually, for example, the time (relative time) for each sector, track, and session are recorded as minutes, seconds, and frames. In the case of CD, since the minutes are two digits, the maximum is 99 minutes, so if the time information is more than 99 minutes 59 seconds 74 frames, it will be reset to 0 00 minutes 0 0 seconds 00 frames Will be done. However, as described above, the data read control does not use the AT IP signal, but uses the information of the sector 1 and the track session written together with the information in each frame. Since even these pieces of information are not the same, relative time information can be used, and there is no problem even if data recording or reproduction takes more than 100 minutes. However, when recorded as a music CD, the time display has only two digits. 1 04 minutes 1 0 0 minutes = 04 minutes 0 2 seconds 0 Only 2 frames will be displayed. However, in practice, 104 minutes of music will be played.

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

(Example 3).

An optical disk according to the present invention was manufactured. Group start and AT IP start radius 21 mm, group end and ATIP end position 59 mm, Lead-in area set time 9 7:27: 00, Program area start time 0 0: 00: 00 The lead-out area set time 49:59:74, the track pitch from the groove start position to the lead-in start position is 1.52 m, and the linear velocity (at 1x speed) is lJinZs. The track pitch in the lead-in area is 1.52. At 〃m, the linear velocity (at 1x speed) is lJmZs The track pitch in the program area is 1.29m and the linear velocity (at 1x speed) is 1.15m / s, and the track pitch in the lead-out area is 1.29m and the linear velocity (at 1x speed) Was set to 1.15 m / s. The program area is 49 minutes 59 seconds 74 frames, but the frame information increases by 1 second every 2 seconds (2 frames increase by 1 frame), so the actual frame is 99 minutes 59 seconds 74 frames Can correspond to the length.

Thereafter, in the same steps as in Example 1, a long-time CD-R according to the present invention was produced.

This long-time CD-R is recorded by a 1- to 12-times speed CD-R writer (Plex Yuichi) and recorded and reproduced by a CD-R standard inspection device (Audio-Depth Corp. CD-CATS). Was evaluated. Book C D-R can record a large amount of data for a long time of 99 minutes (8777 MB), which is 20 minutes longer than the conventional 79 minutes limit time. As a test result, the same performance as described in Example 1 was obtained. This property was maintained from 1x to 12x writing. Furthermore, it was confirmed that there was no problem in 16-speed writing and 20-times speed writing with the pulse test DDU 100, and that the performance was maintained. (Example 4)

An optical disk according to the present invention was manufactured. Group start and AT IP start radius 21 mm, group end and ATIP end position 59 mm, lead-in area set time 9 7: 27: 00, program area set time 0 0: 0 0 : 00, lead-out area set-up time 60: 1 0: 01, the track pitch from the group start position to the lead-in start position is m, and the linear velocity (at 1x speed) is

The track pitch in the lead-in area is 1.52 / m and the linear velocity (at 1x speed) is 1.2m / s. The track pitch in the program area is 1.2m and the linear velocity (at 1x speed) is 1.02m / s. The track bit was 1JOm and the linear velocity (at 1x speed) was 1.02m / s. The program area is 60 minutes 10 seconds 0 1 frame, but the frame information increases by 1 second in 2 seconds (2 frames increase by 1 frame), so actually 120 minutes 20 seconds 0 2 There is a frame length.

Thereafter, a long-time CD-R according to the present invention was produced in the same steps as in Example 1.

This long-time CD—R is recorded with a 1- to 12-times speed CD—R writer (manufactured by Plexter), and is recorded and played back by a CD-R standard inspection device (CD—CATS manufactured by Audio Div.). Was evaluated. This CD-R records long-time large-capacity recording data of 120 minutes (1.05 GB), which is 41 minutes longer than the conventional 79 minutes limit time. However, as the test results, exactly the same performance as described in Example 1 was obtained. This characteristic was maintained from 1x to 12x writing. Furthermore, it was confirmed that there was no problem with 16-speed writing and 20-times speed writing with the Pulstec DDU 100, and that the performance was maintained. In addition, it is necessary to superimpose and record the time code called subcode Q on the written information. The absolute time from the beginning of the program area and its time (for example, sector 1, track, session time (relative time)) are recorded as minutes, seconds, and frames. In the case of a CD, since the minute is displayed in two digits, the same problem as in the second embodiment occurs, but there is no practical problem.

Although the embodiments and examples of the present invention have been described above, it goes without saying that the scope of the present invention is not limited by these descriptions.

Industrial applicability

The optical information recording medium of the present invention can increase the storage capacity while using a conventional recording device and reproducing device, so that it can be used as a large-capacity data recording device such as a computer recording device, music, It can be used for video recording devices and the like. Further, the stamper of the present invention can be used for manufacturing the optical information recording medium of the present invention.

Claims

The scope of the claims

1. A disc-shaped optical information recording medium that records and reproduces information by means of an optical beam tracked along a meandering group or land, with a PCA area and a PMA area in order from the inner circumference to the outer circumference In a device having a lead-in area, a program area, and a lead-out area, time code information recorded in advance is increased by one frame for each of a plurality of real frames. Information recording medium.

2. Having a meandering groove or land, an evening record is defined according to the meandering period of the meandering groove or land, and information is obtained by a light beam tracked along the meandering group or land. An optical information recording medium for performing recording / reproduction according to claim 1, wherein said evening record is increased by one frame for every plural frames.

3. The optical information recording medium according to claim 1 or 2, wherein a PCA area, a PMA area, a lead-in area, a program area, and a lead-out area are arranged in order from an inner periphery to an outer periphery. An optical information recording medium, characterized in that the track pitch of the program area is smaller than the track pitch of the PCA area, the PMA area, and the lead-in area.

4. The optical information recording medium according to claim 1 or 2, wherein in order from an inner periphery to an outer periphery, a PCA area, a PMA area, a lead-in area, a program area, and a lead-out area. An optical information recording medium, characterized in that the track pitch of the program area and the lead-out area is narrower than the track pitch of the PCA area, the PMA area, and the lead-in area.

5. The optical information recording medium according to claim 3 or 4, wherein the linear velocity of the PCA area is the same as the linear velocity of the program area.

6. The optical information recording medium according to any one of claims 1 to 3, wherein the PCA area, the PMA area, the lead-in area, and the program are arranged in order from the inner circumference to the outer circumference. An optical information recording medium having an area and a lead-out area, wherein the linear velocity of the program area is lower than the linear velocity of the PCA area, the PMA area, and the lead-in area.

7. The optical information recording medium according to any one of claims 1 to 3, wherein the PCA area, the PMA area, the lead-in area, and the program are arranged in order from the inner circumference to the outer circumference. An optical information recording medium having an area and a lead-out area, wherein the linear velocity in the program area and the lead-out area is lower than the linear velocity in the PCA area, the PMA area, and the lead-in area.

8. A disc-shaped optical information recording medium that records and reproduces information by an optical beam tracked along a meandering group or land, and the diameter of the optical information recording medium is 12 O mm. , Program recording time

An optical information recording medium, wherein the recording time is 90 to 120 minutes.

9. A stamper having a convex portion corresponding to the concave portion formed on the optical information recording medium according to any one of claims 1 to 8, and a concave portion corresponding to the convex portion.