JP2003178464A - Optical information recording medium, and optical information recording/reproducing method and device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high-performance optical information recording medium applied to land groove recording while a stable clock is secured, and an optical information recording/reproducing method and a device using the same. <P>SOLUTION: On one side wall of each of a land track 101 and a groove track 102, an address information block containing address information is formed by meandering or recessing/projecting, the address information block of the land track and the address information block of the groove track are arranged to be shifted from each other in a track direction. Meandering of a fixed cycle is formed on the side wall of each of the land track and the groove track except the address information block. Thus, address recognition is easily carried out, and a stable synchronizing clock is extracted. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical information recording medium for recording and reproducing information by irradiating a light beam, an optical information recording and reproducing method for recording information or reproducing recorded information using the same. It relates to the device.

[0002]

2. Description of the Related Art Conventionally, an optical disk for recording information with a laser beam or reproducing the recorded information is capable of large-capacity recording and can be accessed at high speed in a non-contact manner. There is. Such an optical disc is classified into a read-only type known as a compact disc and a laser disc, a write-once type that can be recorded by the user, and a rewritable type that can be repeatedly recorded by the user. These optical disks are used as an external memory of a computer or as a document / image file.

In the currently used optical disc, a reproduction signal is detected from the laser beam which is modulated and reflected by the optical disc. For example, in the reproduction-only type, a reproduction signal can be obtained by utilizing the change in the amount of reflected light from the uneven pits formed on the disc. Further, in the write-once type, minute pits formed by high-power laser irradiation or a change in reflected light amount due to a phase change is used for reproduction. Further, in a rewritable magneto-optical disk, the magnetization state of the recording film is read out as a change of the polarization plane by utilizing the magneto-optical effect of the recording film. In another rewritable type phase change optical disk, the change in the reflected light amount of the recording film due to the phase change is used for reproduction, as in the write-once type.

[0004]

By the way, when information is recorded or reproduced using an optical disk medium, it is formed in a spiral shape of 0.61 μm to 1.6 μm pitch formed on a transparent resin or glass substrate. A method of recording / reproducing information is used while controlling the focused laser light to track along the groove.

In the DVD-RAM format adopting this method, one track is divided into a plurality of sectors,
At the beginning of each sector, a track address of the sector, a sector address, and a pre-format concave / convex pit in which a synchronization signal is embedded are recorded. In this system, the track used for recording employs so-called "land groove recording" in which recording is performed on both the concave and convex portions of the groove, and the recording capacity per one side of the disk is 4.7 GB.

In order to increase the track density in this way, the "land / groove recording" system is adopted.
The disk 1 rotation track is divided into a plurality of sectors, and the track address of each sector, the sector address, and the pit as a preformat in which the synchronization signal is embedded are formed, so the amount of data required for this preformat is the entire disk. 10% or more, which itself limits the capacity of the disk.

Further, as a recording format using the groove, there are a CD-R format and a DVD-RW format. In this format, so-called Wobble is used in which the tracking groove is made to meander at a low frequency, and track address information and a synchronization signal are recorded in this Wobble frequency change. For example, in CD-R, Wobble having a fundamental frequency of 22.05 kHz is formed. 140kHz for DVD-RW
A frequency wobble is formed.

[0008] In such a Wobble system, unlike the DVD-RAM, it is not necessary to separately provide a pre-formatted area consisting of pre-pits, so that the format efficiency is improved, but
From the viewpoint that it is difficult to add an independent Wobble signal to the adjacent land and groove, use is limited to groove recording so far.

In the recording format adopting Wobble, as a method of recording on both the land and the groove, a Wobble common to the land and groove is formed on the sidewall common to the land and the groove track, and shared address information is given to the Wobble portion. A method has been proposed. This is described in, for example, Japanese Patent Laid-Open No. 10-27349.

However, this method is complicated because it is necessary to use the address information after determining whether the current track is a land or a groove. Further, since the Wobble is not formed in the portion other than the portion to which the address information is added, there is a problem that it is difficult to extract the clock at the time of recording / reproducing.

The present invention has been made in view of the above-mentioned conventional problems, and an object thereof is not to determine whether it is a land or a groove, and moreover, a stable clock can be secured. An optical information recording medium, and an optical information recording / reproducing method and apparatus using the same.

[0012]

In order to achieve the above object, the optical information recording medium of the present invention has land tracks and groove tracks formed alternately and records information on both the land tracks and the groove tracks. In an optical information recording medium, an address information block including address information is formed by meandering or unevenness on one side wall of each of the land track and the groove track, and the address information block in the land track and the address in the groove track are formed. The information blocks are arranged so as to be displaced in the track direction.

The optical information recording medium of the present invention is an optical information recording medium in which land tracks and groove tracks are alternately formed, and information is recorded on both the land tracks and the groove tracks. An address information block containing address information is formed by meandering or unevenness on each one side wall of each of, and the address information block in the land track and the address information block in the groove track are arranged so as to be displaced in the track direction, and the land The side walls of the track and the groove track are formed with meanders having a constant period except for the address information block.

The optical information recording / reproducing method of the present invention is a method of recording information on the optical information recording medium or reproducing the recorded information, wherein a focused spot is formed on a track of the optical information recording medium. However, the meandering of the track is detected by the change in the intensity distribution of the reflected light from the focused spot, and the address information and the synchronization signal are detected.

The optical information recording / reproducing apparatus of the present invention is an apparatus for recording information on the optical information recording medium or reproducing the recorded information, wherein a focused spot is formed on a track of the optical information recording medium. However, the meandering of the track is detected by the change of the intensity distribution of the reflected light from the focused spot, and the address information and the synchronization signal are detected.

An optical information recording / reproducing apparatus of the present invention is an apparatus for recording information on the optical information recording medium or reproducing the recorded information, which is divided into at least two in the track scanning direction of the recording medium, A photodetector that detects the return light from the recording medium, a differential amplifier that detects the difference between the sum signals of the outputs of the photodetectors on both sides of the photodetector with respect to the track scanning direction, and the differential amplifier Means for detecting the address information and the synchronization signal based on the generated difference output.

An optical information recording / reproducing apparatus of the present invention is an apparatus for recording information on the optical information recording medium or reproducing the recorded information, which is divided into at least two in the track scanning direction of the recording medium. A photodetector for detecting return light from the recording medium, and means for detecting address information based on the output of one of the photodetectors on both sides of the photodetector in the track scanning direction. It is characterized by that.

An optical information recording / reproducing apparatus of the present invention is an apparatus for recording information on the optical information recording medium or reproducing the recorded information, which is divided into at least two in the track scanning direction of the recording medium. A photodetector that detects the return light from the recording medium, and a unit that detects address information and a sync signal based on the output of one of the photodetectors of the photodetectors on both sides in the track scanning direction. It is characterized by having and.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. First, in an optical information recording medium according to an embodiment of the present invention, a track groove is formed in advance on a substrate, and a side wall of the track groove is meandered to provide address information, and a portion to which the address information is provided. The side walls other than the above are characterized by grooves that meander in a constant cycle.

FIG. 1 is a diagram showing an embodiment of the optical information recording medium of the present invention. 1 is an enlarged plan view showing a part of the disc-shaped recording medium according to the present embodiment. In FIG. 1, 101 is a land and 102 is a groove. The lands 101 and the grooves 102 are formed on a substrate (not shown) alternately in the form of convex portions and concave portions at regular intervals, and information can be recorded on both the lands 101 and the grooves 102. These land 101 and groove 10
Reference numeral 2 is formed in the center of the disk in a spiral or concentric shape. In the following description, land is a land track,
The groove is called a groove track.

A wobble 51, which is a meandering portion to which the address information of the land track is added, is formed on a part of one side wall of the land track 101, and the address of the groove is also formed on a part of one side wall of the groove track 102. A wobble 52, which is a meandering portion to which information is added, is formed. In the side wall portion where the address information Wobble is not formed, both the land track and the groove track have a constant period Wo.
The bble 50 is formed.

Wobble 51 in land track 101
The Wobble 52 in the groove track 102 is formed so as to be displaced in the track scanning direction. The formation position of the Wobble which is the address information block may be one side wall on the right side with respect to the focused beam scanning direction as shown in FIG. 1 or one side wall on the left side as shown in FIG. good.

Here, in the prior art, for example, Japanese Patent Laid-Open No. 10-27
Japanese Patent No. 349 proposes a method using a wobbled track groove for land groove recording as described above. In the publication, as shown in FIG. 3, an address information Wobble 55 shared by lands and grooves is provided at the boundary between the target land track 101 and the groove track 102.

In this embodiment, address information is added.
Wobbles are individually provided on desired sidewall tracks or groove tracks on one side wall of the track, and are not shared. For this reason, it is possible to omit the complicated process that has been caused by the conventional address sharing, for example, the process of checking the address after determining whether the current track is a land track or a groove track. Further, since the side walls other than the side wall to which the address information is added are all Wobbles 50 having a constant cycle, a signal for synchronization can be obtained by detecting a signal from this constant cycle Wobble 50.

Next, the shape of the address information added portion formed by Wobble will be described. The Wobble for giving address information is formed on the side wall on one side of the groove. The shape is (1) the phase of Wobble of a single cycle is 18
A combination of two types of Wobble with a constant cycle that differs by 0 degrees
(2) A combination of two or more types of Wobble with different cycles,
(3) A combination of two kinds of 1/2 cycle wobbles having a constant cycle, and (4) a combination of two or more kinds of meandering in which the meandering cycle changes by a certain amount with respect to the reference cycle are used. Hereinafter, specific shapes in the cases of (1) to (4) will be described.

In FIG. 4A, the phase of a single cycle Wobble is 1.
The shape when two types of Wobbles having a constant cycle different by 80 degrees are combined is shown. In FIG. 4A, Wobb in the normal phase state
Information is given by associating le with 1 and Wobble in the opposite phase state with 0. The data in this case is 1011.

FIG. 4B shows two types of Wobble having different periods.
The shape in the case of combining is shown. Information is provided by associating the Wobble of the cycle d with 1 and the Wobble of the cycle 2d with 0. Of course, two or more types with different cycles
Wobble may be used for multilevel information recording. In this case, the data is 10.

FIG. 4 (c) shows a shape in the case where different selected 1/2 cycle length partial waveforms of Wobble having a constant cycle are combined. Information is given by associating the Wobble 53 of the shape Wu with 1 and the Wobble 54 of the shape Wd with 0. The data in this case is also 10
Is.

FIG. 4 (d) shows a shape in the case where two types of Wobbles whose cycle changes by a fixed amount with respect to the reference cycle are combined. Information is provided by associating the wobble of the period d + Δd with 1 and the wobble of the period d−Δd with 0. Of course, multi-valued information recording may be performed using two or more types of Wobbles having different periods. The data in this case is 01.

Although not shown in FIG. 4, in order to identify that each address information added Wobble is an address information added Wobble, an address mark portion composed of a Wobble having a certain shape is formed. good. Although the address information is formed by meandering in FIGS. 1 and 2, the present invention is not limited to this and may be formed by unevenness as in FIG.

Next, the shape of the synchronizing Wobble portion other than the address information added portion formed by Wobble will be described. This Wobble is formed in order to secure the synchronization signal, and is formed on all tracks other than the portion to which the address information is added as described above. In detecting the sync signal, it is desirable that the tracks meander in a state where the phases on both sides of the track are aligned.

Since the formation of the wobble of the track groove is usually realized by meandering the groove side wall of the groove part,
Also in this Wobble formation, the groove portion is formed to meander. In this case, since the side wall of the land part is common to the one side wall of both adjacent groove parts, in order to align the Wobble phase of the land part side wall, the Wobble of the adjacent groove part should also be in the same phase. desirable. FIG. 5A shows a state in which the land track 101 and the groove track 102 are in phase, and FIG. 5B shows a state in which the phase is not. If the phases are not aligned as shown in FIG. 5B, the Wobble signal cannot be detected well.

In order to make the phases of adjacent tracks uniform, for example, when the medium is rotated at a constant angular velocity (CAV), the number of Wobbles per track from the inner track to the outermost track is It may be formed so as to be constant. In this case, the length of one cycle of Wobble becomes longer toward the outer circumference, but the Wobb reproduced from these Wobbles
Since the frequency of the le signal is CAV rotation, it becomes a constant frequency signal.

If it is desired to avoid a long Wobble cycle at the outer circumference, the recording medium itself is divided into a plurality of concentric zones from the inner circumference to the outer circumference, and the so-called ZCAV is set so that the angular velocity is constant in each zone. The rotation method may be used.
In this case, in each zone,
Wobbles are formed by aligning the phases so that the number of Wobbles is constant.

Further, for forming the Wobble described here, a process conventionally used for producing an optical disc master can be used. That is, a short wavelength laser, for example, a wavelength of 351n is applied to a glass master that is a glass coated with a photoresist.
A sub-micron width track is formed by using an ultraviolet Ar ion laser of m or a semiconductor laser excitation type ultraviolet laser of 266 nm in wavelength for exposure. The track shape of the present embodiment is a Wobble shape in which address information is included only on one side, and since a synchronization Wobble is formed on the other side wall,
So-called two-beam exposure, which focuses two beams on the same track on the master, is essential. In the two-beam exposure, the exposure is performed in such a manner that each beam shares the formation of both side walls of the groove.

Next, the cross-sectional structure of the optical information recording medium having the desired format according to the present embodiment will be explained. FIG. 6 is a sectional view of the recording medium. FIG. 6A shows a basic structure in which the recording layer 2 is formed on the substrate 1 on which a desired format is formed. FIG. 6B shows the structure in the case of the double-sided structure. This is two pieces of the same structure, the adhesive layer 3
It is a structure that is bonded via.

Normally, as the substrate 1, a disc-shaped substrate having a thickness of 1.2 mm or 0.6 mm is used. Figure 6 (b)
As shown in FIG. 6, when the two basic structures are bonded together, the structure is such that the recording layer 2 side is placed inside and the adhesive 3 is used for bonding. However, as shown in FIG. It is also possible to adopt a structure in which the recording layer 2 is formed on a thick substrate 1 having a relatively high rigidity, and an extremely thin cover layer 4 is further formed thereon. Although not shown in FIG. 6, the recording layer 2 and the cover layer 4 may be provided on both sides of the substrate plate 1 to form a double-sided medium.

As the substrate 1, in the case of the substrate incident type, a material having high optical transparency is used. For example, resin such as glass or polycarbonate is used. Substrate 1 has
A guide groove for tracking is formed in advance. Both concave and convex portions of the guide groove or concave and convex can be used for recording data, but in the present embodiment, so-called land-groove recording using both convex and concave portions is used.

The recording layer 2 can be used as a magneto-optical recording medium by sequentially forming, for example, a base protective film, a magneto-optical recording film, an upper protective film, and a metal reflective film. In this case, a dielectric such as SiN or AlN is used for the base protection film and the upper protection film, and TbFe, GdTbFe, Tb is used for the magneto-optical recording film.
A single layer film or a multilayer film of a rare earth transition metal alloy such as DyFe, TbFeCo, GdFeCo is used.

Further, as the recording layer 2, for example, a base protective film, a phase change recording film, an upper protective film, a reflective film, or a first dielectric film, a phase change recording film, a second dielectric film, A reflective film, or a first dielectric film, a second dielectric film, a phase change recording film, a third dielectric film, a reflective film, or at least a first dielectric film, a phase change recording film By forming the second dielectric film and the transmissive reflective film, it can be used as a phase change optical recording medium.

In this case, the underlying protective film, the upper protective film, the first dielectric film, the second dielectric film and the third dielectric film are ZnS, SiO2, ZnS-SiO2, GeN, GeCrN, AlN. , TaO, GeA
A single dielectric material such as 1N, SiO, Al2O3, SiN, or a multilayer film is used. Further, as the phase change recording film, GeSbTe, Ge
Thin films such as SbSnTe, AgInSbTe, GeTe, SbTe, InSbTe are used. Further, Al, Ag, Au, NiCr or an alloy containing these as the main components is used as the reflective film, and Si, Ge or a compound containing these as the main components can be used as the transmissive reflective film.

When a write-once type so-called recordable medium (R medium) is formed as the recording layer 2,
A thin film containing an organic dye exhibiting a certain absorption with respect to the laser wavelength used or a low melting point metal such as Sn, Bi, In, Te, Pb is used. In some cases, these organic dye and the low melting point metal thin film are used. It is also possible to use a structure in which a dielectric protective film and a reflective film are formed above and below the substrate. Thereby, it can be used as a write-once type optical recording medium.

Next, a method of recording and reproducing information by using the optical information recording medium of the present invention will be described. In this embodiment, the land and groove tracks are formed.
The Wobble signal is detected and the address information and the clock signal for synchronization are extracted. FIG. 7 shows a schematic configuration of the detection system during Wobble reproduction. Here, a case where a photodetector divided into two in the track scanning direction is used will be described.

Reference numeral 10 in the figure denotes the optical information recording medium (here, an optical disc) described with reference to FIGS. now,
It is assumed that the groove track 102 of the optical disc 10 is irradiated with a light beam from a laser light source (not shown).
The reflected light 30 from the groove track of the optical disc 10 is condensed by the condenser lens 21 and detected by the left and right light receiving portions of the two-divided photodetector 22.

In this case, the reflected light from the optical disk 10 is
Since the intensity is changed in the track direction by being modulated by the Wobble, the differential amplifier 33 differentially detects the output signals of the left and right light receiving portions of the two-divided photodetector 22 to obtain the Wobble.
A signal 31 reflecting the modulation is obtained. In addition, the sum signal 32 is obtained by adding the output signals of the left and right light receiving portions of the two-divided photodetector 22 by the addition amplifier 34. The sum signal 32 is a reproduction signal when information is reproduced as a change in reflected light amount.

Although a two-division photodetector is used as the photodetector in FIG. 7, the invention is not limited to this, and it is divided into four divisions and six divisions.
It is also possible to use a photodetector divided into many light receiving portions such as division or eight divisions. In that case, the difference between the sum signal obtained by adding the outputs of the right-half light-receiving portions to the track scanning direction and the sum signal obtained by adding the outputs of the left-half light-receiving portions may be calculated.

As a signal detecting method, desired address information can be obtained only from the signal of either the left or right light receiving unit without necessarily taking the difference between the signals of the left and right light receiving units detected by the photodetector 22. It is possible to obtain a synchronization signal.
Therefore, the address information and the synchronization signal may be detected based on the signal of either one of the left and right light receiving portions of the photodetector.

FIG. 8 is a diagram showing an example of an optical head of an optical information recording / reproducing apparatus for recording / reproducing information using the optical information recording medium of the present invention. Here, recording and reproduction are performed on the phase change type optical recording medium. Information is recorded / reproduced on / from the optical disc 10, which is an optical information recording medium, by using the optical head 20. The optical head 20 includes at least a condenser lens 21, a photodetector 22, a laser light source 23, polarized beam splitters 24 and 25, condenser lenses 24 and 27,
A photodetector 28 is provided. The photodetector 28 is for servo control. In FIG. 8, the same parts as those in FIG. 7 are designated by the same reference numerals, and the condenser lens 21 and the photodetector 22 are shown in FIG.
Is the same as

When recording information on the optical disk 10,
The laser light source 23 is driven by a drive circuit (not shown) that is modulated according to the recording data, and the laser light that is modulated according to the recording data is focused on the optical disc 10.
In the case of a phase change type recording film, the recording film is once heated to a temperature equal to or higher than the melting point and then rapidly cooled to form an amorphous recording mark. On the other hand, at the time of reproducing the recorded information, the optical disk 10 is irradiated with a reproducing laser beam that is considerably weaker than that at the time of recording, and the difference in the return light level caused by the difference in the reflectance between this recording mark and the surrounding crystalline erased portion is reduced. A reproduction signal is obtained by detecting with the photodetector 22.

Here, prior to the recording of information, the focused laser beam from the optical head 20 is focused on the land track or groove track of the optical disk 10. At this time, the change of the return light generated by the Wobble 50 having a constant cycle formed on the track is reproduced as a differential output of the photodetector 22 divided into two in the track scanning direction, and a synchronization signal is obtained. Further, the address information is reproduced from the address information part in which the wobble is formed only on one side of the track.

The sector to be recorded is confirmed based on this address information, and recording is performed after the focused laser beam moves to the desired sector. As for the correspondence between the recording sector and the address information section in which the one-sided Wobble is formed, the recording sector may be immediately after the address information section 51 or 52 as shown in FIG. 1, or a sector several sectors later may correspond to the address information section. It may be used as a sector. What is required is that the address information part 51 or 52 of the Wobble on one side and the sector of that address are 1
It corresponds to one-to-one.

When the recorded data is reproduced after the recording, the address information from the address information section 51 or 52 of the one-sided Wobble is reproduced as in the case of the recording, and it is confirmed based on the reproduced address information. Data is reproduced after the focused laser beam moves to a desired sector.

It should be noted that the Wobble having a constant period for forming the synchronization signal
Is the address Wo of the track with the address information block
Although it is formed on all the tracks except the side wall where the bble is not formed and the address information block, since the wobble for forming the synchronization signal is formed only on one side wall in the address information block, compared to other track parts. There is a possibility that the S / N ratio at the time of detecting the synchronization signal may decrease. To address this, (1) the sync signal is detected only from tracks other than the address information block, (2) the frequency difference between the constant period Wobble and the address Wobble is set large, and the signals are separated by a bandpass filter or the like at the time of detection. However, a method of extracting the sync signal from all the tracks may be adopted.

FIG. 9 is a block diagram showing an embodiment of an optical information recording / reproducing apparatus for recording information or reproducing recorded information by using the optical information recording medium of the present invention. The recording medium is the optical disk 10 as in FIG. Also,
An optical head 20 is the same as that of FIG.

In the figure, 201 is a spindle motor for supporting and rotating the optical disk 10, 202 is a rotation control circuit for controlling the rotation of the spindle motor 201, and 204 is driving and rotating the laser light source 23 in the optical head 20. Information is recorded by condensing a recording laser beam at a predetermined position on the optical disc 10, and at the time of reproduction, reproduction of recorded information is performed based on an output signal of a photodetector in the optical head 20. Circuit.

The recording / reproducing circuit 204 also generates a signal such as a Wobble signal, a focus servo error signal or a tracking servo error signal based on the output signal of the photodetector in the optical head. Reference numeral 203 denotes a servo control circuit that performs focus control, tracking control, and position control of the optical head 20 based on the focus error signal or tracking error signal from the recording / reproducing circuit 204 and the control of the controller 210, and 205 denotes a signal from the recording / reproducing circuit 204. Based on Wo
A wobble detection circuit that detects the bble signal, and 206 is an address detection circuit that detects address information indicating the position of the light beam on the optical disc 10 by demodulating and decoding the wobble signal from the wobble detection circuit 205.

Reference numeral 208 denotes a sync signal generation circuit for generating a sync signal based on the signal from the Wobble detection circuit 205, 21
Reference numeral 1 denotes an interface for exchanging recording / reproducing instruction data and recording / reproducing data with a host computer, and 207 adds an error correction code to the recording data from the interface 211 to generate the recording data and converts the recording data into a format suitable for recording. A recording data processing circuit for converting and modulating, a reproduction data processing circuit 209 for generating reproduction data by demodulating a reproduction data signal from the recording / reproducing circuit 204 and performing error correction of the reproduction data, and 210 controls each part of the apparatus. It is a controller to do.

FIG. 10 is a block diagram showing an example of the synchronization signal generation circuit 208. The circuit of FIG. 10 cuts the high frequency component of the phase difference signal from the phase comparison circuit 208b and the phase comparison circuit 208b which compares the phase of the Wobble signal extracted by the Wobble detection circuit 205 with the frequency division signal from the frequency division circuit 208a. The low-pass filter 208c and the VFO 208d that generate a synchronization signal based on the phase difference signal from the low-pass filter 208c, and the frequency dividing circuit 208a that divides the frequency of the VFO 208d to the frequency corresponding to the Wobble signal.

The synchronizing signal generating circuit 208 is a PLL (Ph
ase lock loop) circuit, and the divider circuit 208
The frequency division ratio set by a is set by the ratio between the frequency required for the recording / reproducing synchronization signal and the Wobble signal frequency. Therefore, the synchronization signal generation circuit 208 generates a reference synchronization signal having a constant ratio based on the frequency of the Wobble signal.

FIG. 11 is a signal waveform diagram showing signals of respective parts of the synchronizing signal generating circuit 208. 11A is a Wobble signal, FIG. 11B is an output of the frequency dividing circuit 208a, and FIG.
(C) shows the signal waveform of the reference synchronization signal. The cycle of the Wobble signal and the cycle of the output of the frequency dividing circuit 208a are controlled so as to coincide with each other, and a reference synchronization signal having a frequency higher than the frequency of the Wobble signal is obtained.

Next, a method of detecting address data from the address information block will be described. In the present embodiment, as described in FIG. 4, there are four types of address information blocks.
Wobble form is used. First, FIG. 4A shows a shape in which two types of Wobbles of a constant cycle in which the phase of a single cycle of Wobble differs by 180 degrees are combined, and FIG. 12 shows an example of the address detection circuit 206 suitable for this mode. It is a block diagram.

In FIG. 12, the bandpass filter 20 corresponding to the Wobble frequency is used as the address detection circuit 206.
61a and the phase detector 2061b are used. here,
The bandpass filter 2061a is a circuit that extracts only the Wobble signal in a specific frequency band related to address information from the Wobble signal. This signal is output to the phase detector 2061b, and the phase detector 2061b detects the phase of the Wobble signal to restore the address information.

FIG. 4B shows two types of Wobble having different periods.
FIG. 13 is a block diagram showing an example of an address detection circuit suitable for this mode. In FIG. 13, a bandpass filter 2062a and a frequency detector 2062b corresponding to the Wobble frequency are used as the address detection circuit 206. Bandpass filter 2
Reference numeral 062a is a circuit for extracting only a Wobble signal in a specific frequency band related to address information from the Wobble signal.

This signal is sent to the frequency detector 2062b, and the frequency detector 2062b determines 0 or 1 depending on whether the Wobble signal is higher or lower than the reference frequency. For example, if the Wobble signal is 350kHz and 700kHz, 2
In the case of frequency, the frequency detector performs binarization with 525 kHz as the threshold value.

FIG. 4C shows a shape in which different selected 1/2 cycle length partial waveforms of Wobble having a constant cycle are combined, and FIG. 14 shows an example of the address detection circuit used in this mode. It is a block diagram. In FIG. 14, a low pass filter 2063a and a level comparator 2063b are used as the address detection circuit 206. The low-pass filter 2063a extracts the DC level of the Wobble signal of 1/2 cycle, and the level comparator 2063b determines whether the extracted DC level is binary. Thereby, 0 or 1 of the address information can be determined. For example, in FIG.
When detecting the Wobble, the Wobble 53 and the Wobble 54 respectively show a positive potential and a negative potential after passing through the low-pass filter 2063a, so the level comparator 2063b determines the level based on the zero level and performs binarization.

Although FIG. 4D shows a shape in which two types of Wobbles in which the cycle changes by a fixed amount with respect to the reference cycle are combined, the same address detection circuit 206 as in FIG. 13 can be used. That is, the band pass filter 2062a and the frequency detector 2062b corresponding to the Wobble frequency.
The address information can be detected by using. The bandpass filter 2062a extracts only the Wobble signal in the specific frequency band related to the address information from the Wobble signal as described above, and this signal is output to the frequency detector 2062b. The frequency detector 2062b makes a determination of 0 or 1 depending on whether the Wobble signal is higher or lower than the reference frequency. For example, the Wobble signal is 650kHz and 750k
In the case of two frequencies of Hz, the frequency detector performs binarization with 700 kHz as the threshold value.

Next, the information recording operation of the optical information recording / reproducing apparatus of FIG. 9 will be described. First, when a recording instruction is issued from the host computer, the controller 210 recognizes the recording instruction via the interface 211 and starts the processing for the recording operation. First, the controller 2
Reference numeral 10 sets the physical address from the recording start address instructed by the host computer and also sets the instructed recording sector number. Next, the controller 210 performs an access operation to the track including the sector position to be recorded.

Regarding this access operation, the controller 210 recognizes the current address information successively obtained from the address detection circuit 206 and controls the servo control circuit 203 to control the optical head 20 to move it to the target position. When the movement of the light beam of the optical head 20 to the desired position is completed, the Wobble detection circuit 205 extracts the Wobble signal in the groove or land track which the light beam is currently irradiating, and based on this, the recording synchronization signal is synchronized. It is generated by the signal generation circuit 208.

Further, the controller 210 uses the optical disc 1
The power condition necessary for recording is set according to the radial position of 0. Next, the controller 210 determines whether or not the current address obtained by the address detection circuit 206 matches the target address, and if they match, recording in sector units is started.

On the other hand, the recording data processing circuit 207 divides the recording data transmitted from the host computer via the interface 211 into predetermined sector sizes and adds an error correction code to generate recording data. At this time, the generated data is the synchronization signal generation circuit 20.
It is synchronized with the recording synchronization signal from the recording medium 8 and is output to the recording / reproducing circuit 204 as recording modulation data. The laser light source 23 in the optical head 20 is driven by this modulated data,
Information is recorded by irradiating a desired position on the optical disc 10 with a light beam from the optical head 20.

Next, the reproducing operation of the apparatus shown in FIG. 9 will be described. When the reproduction instruction is issued from the host computer, the controller 210 recognizes the reproduction instruction via the interface 211 and starts the processing for the reproduction operation. First, the controller 210 sets the physical address from the reproduction start address designated by the host computer. Next, the controller 210 performs an access operation to the track including the position to be reproduced.

When the movement of the light beam of the optical head 20 to the desired position is completed, the Wobble detection circuit 206 extracts the Wobble signal in the groove track or the land track where the light beam is currently tracing, and it is set in the zone of the disk radial position. The matching sync signal for reproduction is generated by the sync signal generation circuit 208. The controller 210 determines whether or not the current reproduction address obtained from the address detection circuit 206 matches a predetermined address, and if they match, the reproduction data processing circuit 209 reproduces the desired position. At this time, the reproduction data processing circuit 209 performs error correction processing and decoding of the reproduction signal in synchronization with the reproduction synchronization signal from the synchronization signal generation circuit 208 to generate reproduction data. The reproduction data is transmitted to the host computer via the interface 211.

[0073]

EXAMPLES Next, in order to confirm the effectiveness of the present invention, the inventors of the present application produced the optical information recording medium described with reference to FIGS. 1 to 6 and tried an evaluation experiment for recording and reproducing. As the optical information recording medium, a phase change optical recording medium, a magneto-optical recording medium, and an additional type optical recording medium were manufactured, and recording and reproduction of each recording medium were evaluated. Hereinafter, this will be described in Example 1
16 will be described.

(Example 1) In Example 1, the substrate of the recording medium has an outer diameter of 120 mm, an inner diameter of 15 mm, and a substrate thickness of 0.1 mm.
A 6 mm polycarbonate resin substrate was used. As the substrate, a substrate having Wobble grooves formed by mastering in advance was used. The shape of the groove formed on the substrate is
Depth of 60 nm, groove width of land and groove is 0.58
μm. This groove has a spiral shape and wobbles when the substrate is rotated at a linear velocity of 5.636 m / s from the inner circumference to the outer circumference.
Wobble was formed so that the frequency was 140 kHz.

At the innermost radius of 24 mm, 3746 Wobbles were formed per track, and at the outermost radius of 58 mm, 9000 Wobbles were formed. Wobb in the radial direction
The maximum displacement of le was 20 nm. Further, the recording area of the recording medium was divided into 100 zones in the radial direction, and in each zone, the Wobble was formed so that the Wobble phase was aligned in the radial direction on the land track and the groove track. On the other hand, the one-sided Wobble in which the address information is formed is formed in the form of FIG. 4A every 64 kBytes. Information “1” has 700kHz positive phase Wob
For ble, the information “0” is formed with Wobbles having an opposite phase of 700 kHz for 4 cycles each, and these are combined to record the address information.

On this substrate, as a recording layer, a first dielectric film made of ZnS-SiO2, GeSbTe, was formed from the substrate side by a sputtering method.
A phase-change recording medium was manufactured by sequentially forming a phase-change recording film made of, a second dielectric film made of ZnS-SiO2, and an AlTi reflective film. Next, on the side opposite to the side where the recording layer is formed, the thickness is 0.6 m.
m, an outer diameter of 120 mm, and an inner diameter of 15 mm, a polycarbonate substrate was attached with an adhesive.

Next, an optical head for a phase-change recording medium was used to try a recording / reproducing experiment on this medium. The laser wavelength of the optical head is 650 nm, and the NA of the condenser lens is 0.65. At the time of recording / reproducing, the address information and the synchronizing signal from the single Wobble were obtained using the differential output of the two-division photodetector of the optical head. An address detection circuit having the same configuration as that in FIG. 12 was used for detecting an address, and a synchronization signal generation circuit corresponding to that in FIG. 10 was used for detecting a synchronization signal. Recording and reproduction were performed using these, and it was confirmed that good recording and reproduction could be performed.

Example 2 In Example 2, as in Example 1, a polycarbonate resin substrate having an outer diameter of 120 mm, an inner diameter of 15 mm and a substrate thickness of 0.6 mm was used as the substrate. Further, a substrate having Wobble grooves formed by mastering in advance was used. The groove formed on the substrate has a depth of 60 nm, and the groove width of the land / groove is 0.58 μm. This groove has a spiral shape, and the Wobble was formed so that the Wobble frequency was 140 kHz when the substrate was rotated at a linear velocity of 5.636 m / s from the inner circumference to the outer circumference.

At the innermost radius of 24 mm, 3746 Wobbles were formed per track, and at the outermost radius of 58 mm, 9000 Wobbles were formed. Wobb in the radial direction
The maximum displacement of le was 20 nm. Further, the recording area of the recording medium was divided into 100 zones in the radial direction, and in each zone, a wobble was formed so that the land track and the groove track were aligned in the radial direction. On the other hand, the one-sided Wobble in which the address information is formed is formed in the form of FIG. 4B every 64 kBytes. Four cycles of 700 kHz Wobble were formed in the information "1", two cycles of 350 kHz Wobble were formed in the information "0", and the address information was recorded by combining them.

On this substrate, as a recording layer, a first dielectric film made of ZnS-SiO2, GeSb, was formed by sputtering from the substrate side.
A phase change recording medium was prepared by sequentially forming a phase change recording film made of Te, a second dielectric film made of ZnS-SiO2, and an AlTi reflective film. Next, on the side opposite to the side where the recording layer is formed, the thickness is 0.6 m.
m, an outer diameter of 120 mm, and an inner diameter of 15 mm, a polycarbonate substrate was attached with an adhesive.

Next, an optical head for a phase-change recording medium was used, and a recording / reproducing experiment for this medium was tried. The laser wavelength of the optical head is 650 nm, and the NA of the condenser lens is 0.65. At the time of recording / reproducing, the address information and the synchronizing signal from the single Wobble were obtained by using the differential output of the two-division photodetector of the optical head. An address detection circuit equivalent to that shown in FIG. 13 was used to detect the address information, and the threshold frequency of the frequency detector at that time was 525 kHz. Further, a sync signal generation circuit corresponding to FIG. 10 was used for detection of the sync signal. Recording and reproduction were performed using these circuits, and it was confirmed that good recording and reproduction could be performed.

Example 3 In Example 3, as in Example 1, a polycarbonate resin substrate having an outer diameter of 120 mm, an inner diameter of 15 mm and a substrate thickness of 0.6 mm was used as the substrate. Further, a substrate having Wobble grooves formed by mastering in advance was used. The groove formed on the substrate has a depth of 60 nm, and the groove width of the land / groove is 0.58 μm. This groove has a spiral shape, and the Wobble was formed so that the Wobble frequency was 140 kHz when the substrate was rotated at a linear velocity of 5.636 m / s from the inner circumference to the outer circumference.

At the innermost radius of 24 mm, 3746 Wobbles were formed per track, and at the outermost radius of 58 mm, 9000 Wobbles were formed. Wobb in the radial direction
The maximum displacement of le was 20 nm. Further, the recording area of the recording medium was divided into 100 zones in the radial direction, and in each zone, a wobble was formed so that the land track and the groove track were aligned in the radial direction. On the other hand, the one-sided Wobble in which the address information is formed is formed every 64 kBytes in the form of FIG. The information "1" has four 1/2 cycles displaced in the inner circumferential direction by Wobble of 700 kHz, and the information "0" has 700
Address information was recorded by associating four 1/2 cycles displaced in the outer peripheral direction with a wobble of kHz and combining them.

On this substrate, as a recording layer, a first dielectric film made of ZnS-SiO2, GeSb, was formed from the substrate side by a sputtering method.
A phase change recording medium was prepared by sequentially forming a phase change recording film made of Te, a second dielectric film made of ZnS-SiO2, and an AlTi reflective film. Next, on the side opposite to the side where the recording layer is formed, the thickness is 0.6 m.
m, an outer diameter of 120 mm, and an inner diameter of 15 mm, a polycarbonate substrate was attached with an adhesive.

Next, an optical head for a phase change recording medium was used, and a recording / reproducing experiment for this medium was tried. The laser wavelength of the optical head is 650 nm, and the NA of the condenser lens is 0.65. At the time of recording / reproducing, the address information and the synchronizing signal from the single Wobble were obtained using the differential output of the two-division photodetector of the optical head. An address detection circuit equivalent to that in FIG. 14 was used for address detection, and a synchronization signal generation circuit corresponding to that in FIG. 10 was used for detection of the synchronization signal. Recording and reproduction were performed using these circuits, and it was confirmed that good recording and reproduction could be performed.

Example 4 In Example 4, as in Example 1, a polycarbonate resin substrate having an outer diameter of 120 mm, an inner diameter of 15 mm and a substrate thickness of 0.6 mm was used as the substrate. Further, a substrate having Wobble grooves formed by mastering in advance was used. The groove formed on the substrate has a depth of 60 nm, and the groove width of the land portion / groove portion is 0.58 μm. This groove has a spiral shape, and the Wobble was formed so that the Wobble frequency was 140 kHz when the substrate was rotated at a linear velocity of 5.636 m / s from the inner circumference to the outer circumference.

At the innermost radius of 24 mm, 3746 Wobbles were formed per track, and at the outermost radius of 58 mm, 9000 Wobbles were formed. Wobb in the radial direction
The maximum displacement of le was 20 nm. In addition, the recording area of the recording medium was divided into 100 zones in the radial direction, and in each zone, wobbles were formed so that the lands and grooves were aligned in the radial direction. On the other hand, one-sided Wobble with address information formed
Are formed in the form of FIG. 4D every 64 kBytes. The information “1” is associated with the 750 kHz Wobble 4 cycle, and the information “0” is associated with the 650 kHz Wobble 4 cycle, and these are combined to record the address information.

On this substrate, as a recording layer, a first dielectric film made of ZnS-SiO2, GeSb, was formed from the substrate side by a sputtering method.
A phase change recording medium was prepared by sequentially forming a phase change recording film made of Te, a second dielectric film made of ZnS-SiO2, and an AlTi reflective film. Next, on the side opposite to the side where the recording layer is formed, the thickness is 0.6 m.
m, an outer diameter of 120 mm, and an inner diameter of 15 mm, a polycarbonate substrate was attached with an adhesive.

Next, an optical head for a phase change recording medium was used to try a recording / reproducing experiment on this medium. The laser wavelength of the optical head is 650 nm, and the NA of the condenser lens is 0.65. At the time of recording / reproducing, the address information and the synchronizing signal from the single Wobble were obtained using the differential output of the two-division photodetector of the optical head. An address detection circuit equivalent to that in FIG. 13 is used for address detection, and the threshold frequency of the frequency detector is 70
It was set to 0 kHz. A sync signal generation circuit corresponding to that shown in FIG. 10 was used to detect the sync signal. Recording and reproduction were performed using these, and it was confirmed that recording and reproduction could be performed well.

Example 5 In Example 5, as in Example 1, a polycarbonate resin substrate having an outer diameter of 120 mm, an inner diameter of 15 mm and a substrate thickness of 0.6 mm was used as the substrate. Further, a substrate having Wobble grooves formed by mastering in advance was used. The groove formed on the substrate has a depth of 60 nm, and the groove width of the land / groove is 0.58 μm. This groove has a spiral shape, and the Wobble was formed so that the Wobble frequency was 140 kHz when the substrate was rotated at a linear velocity of 5.636 m / s from the inner circumference to the outer circumference.

At the innermost radius of 24 mm, 3746 Wobbles were formed per track, and at the outermost radius of 58 mm, 9000 Wobbles were formed. Wobb in the radial direction
The maximum displacement of le was 20 nm. Further, the recording area of the recording medium was divided into 100 zones in the radial direction, and in each zone, a wobble was formed so that the land track and the groove track were aligned in the radial direction. On the other hand, the one-sided Wobble in which the address information is formed is formed in the form of FIG. 4A every 64 kBytes. Information “1” is 700kHz positive phase Wobble
In the information "0", Wobbles having an opposite phase of 700 kHz were formed for four cycles, respectively, and these were combined to record the address information.

On this substrate, as a recording layer, a SiN underlayer protective film, a TbFeCo magneto-optical recording film, an S
An iN upper protective film and an AlTi metal reflective film were sequentially formed to fabricate a magneto-optical recording medium. Next, a polycarbonate substrate having a thickness of 0.6 mm, an outer diameter of 120 mm, and an inner diameter of 15 mm was attached to the surface opposite to the recording layer forming side with an adhesive.

Next, using an optical head for a magneto-optical recording medium, a recording / reproducing experiment for this medium was tried. The laser wavelength of the optical head is 650 nm, and the NA of the condenser lens is 0.65. At the time of recording / reproducing, the address information and the synchronizing signal from the single Wobble were obtained using the differential output of the two-division photodetector of the optical head. An address detection circuit equivalent to that in FIG. 12 was used for address detection, and a synchronization signal generation circuit corresponding to that in FIG. 10 was used for detection of the synchronization signal. Recording and reproduction were performed using these, and it was confirmed that good recording and reproduction could be performed.

Example 6 In Example 6, as in Example 1, a polycarbonate resin substrate having an outer diameter of 120 mm, an inner diameter of 15 mm and a substrate thickness of 0.6 mm was used as the substrate. Further, a substrate having Wobble grooves formed by mastering in advance was used. The groove formed on the substrate has a depth of 60 nm, and the groove width of the land / groove is 0.58 μm. This groove has a spiral shape, and the Wobble was formed so that the Wobble frequency was 140 kHz when the substrate was rotated at a linear velocity of 5.636 m / s from the inner circumference to the outer circumference.

At the innermost radius of 24 mm, 3746 Wobbles were formed per track, and at the outermost radius of 58 mm, 9000 Wobbles were formed. Wobb in the radial direction
The maximum displacement of le was 20 nm. Further, the recording area of the recording medium was divided into 100 zones in the radial direction, and in each zone, a wobble was formed so that the land track and the groove track were aligned in the radial direction. On the other hand, the one-sided Wobble in which the address information is formed is formed in the form of FIG. 4A every 64 KByte. Information “1” is 700kHz positive phase Wobble
In the information "0", Wobbles having an opposite phase of 700 kHz were formed for four cycles, respectively, and these were combined to record the address information.

A TeSn alloy thin film was formed as a recording layer on this substrate by sputtering to obtain a write-once type optical recording medium. Next, on the side opposite to the side where the recording layer is formed, the thickness is 0.6 m.
m, an outer diameter of 120 mm, and an inner diameter of 15 mm, a polycarbonate substrate was attached with an adhesive.

Next, using the optical head, a recording / reproducing experiment for this medium was tried. The laser wavelength of the optical head is 650n
m, NA of the condenser lens is 0.65. At the time of recording / reproducing, the address information and the synchronizing signal from the single Wobble were obtained by using the differential output of the two-division photodetector of the optical head. An address detection circuit equivalent to that in FIG. 12 is used for address detection,
A sync signal generation circuit corresponding to that shown in FIG. 10 was used for sync signal detection. Recording and reproduction were performed using these, and it was confirmed that good recording and reproduction could be performed.

Example 7 In Example 7, a polycarbonate resin substrate having an outer diameter of 120 mm, an inner diameter of 15 mm and a substrate thickness of 1.1 mm was used as the substrate. Further, a substrate having Wobble grooves formed by mastering in advance was used. The groove formed on the substrate has a depth of 40n.
m, and the groove width of the land portion / groove portion is 0.30 μm. This groove has a spiral shape, and Wobble was formed so that the Wobble frequency was 280 kHz when the substrate was rotated at a linear velocity of 5.636 m / a from the inner circumference to the outer circumference.

At the innermost radius of 24 mm, 7492 Wobbles were formed per track, and at the outermost radius of 58 mm, 18,000 Wobbles were formed. Wo in radial direction
The maximum bble displacement was 12 nm. Further, the recording area of the recording medium was divided into 200 zones in the radial direction, and in each zone, a wobble was formed such that the land track and the groove track were aligned in the radial direction. On the other hand, the one-sided Wobble in which the address information is formed is formed in the form of FIG. 4A every 64 kBytes. Information "1" has a positive phase wobble of 1.4MHz
In the information "0", wobbles of 1.4 MHz in antiphase are formed for four cycles, respectively, and these are combined to record the address information.

On this substrate, as a recording layer, an AlTi reflective film, a first dielectric film made of ZnS-SiO2, a phase change recording film made of GeSbTe, and a second dielectric film made of ZnS-SiO2 were formed by sputtering from the substrate side. A body film was sequentially formed to prepare a phase change recording medium. Then, a cover layer having a thickness of 95 is formed on the recording layer forming surface.
A polycarbonate cover film having a thickness of μm was adhered using an ultraviolet curable resin (SD-523 manufactured by Dainippon Ink). At this time, the total thickness of the cover film and the ultraviolet curable resin was 100 μm.

Next, an optical head for a phase change recording medium was used, and a recording / reproducing experiment for this medium was tried through the cover layer. The laser wavelength of the optical head is 405 nm,
NA is 0.85. At the time of recording / reproducing, the address information and single
Got the sync signal from Wobble. Figure 12 for address detection
An address detection circuit equivalent to the above was used, and a synchronization signal generation circuit corresponding to that in FIG. 10 was used to detect the synchronization signal. Recording and reproduction were performed using these, and it was confirmed that good recording and reproduction could be performed.

Example 8 In Example 8, as in Example 7, a polycarbonate resin substrate having an outer diameter of 120 mm, an inner diameter of 15 mm and a substrate thickness of 1.1 mm was used as the substrate. Further, a substrate having Wobble grooves formed by mastering in advance was used. The groove formed on the substrate has a depth of 40 nm and the groove width of the land portion / groove portion is 0.30 μm. This groove has a spiral shape, and the Wobble was formed so that the Wobble frequency was 280 kHz when the substrate was rotated at a linear velocity of 5.636 m / s from the inner circumference to the outer circumference.

At the innermost radius of 24 mm, 7492 Wobbles were formed per track, and at the outermost radius of 58 mm, 18,000 Wobbles were formed. Wo in radial direction
The maximum bble displacement was 12 nm. Further, the recording area of the recording medium was divided into 200 zones in the radial direction, and in each zone, a wobble was formed such that the land track and the groove track were aligned in the radial direction. On the other hand, the one-sided Wobble in which the address information is formed is formed in the form of FIG. 4B every 64 kBytes. Four wobble cycles of 1.4 MHz were formed in the information "1", and four wobble cycles of 700 kHz were formed in the information "0", and address information was recorded by combining them.

On this substrate, as a recording layer, an AlTi reflective film, a first dielectric film made of ZnS-SiO2, a phase change recording film made of GeSbTe, and a second dielectric film made of ZnS-SiO2 were formed from the substrate side by a sputtering method. A body film was sequentially formed to prepare a phase change recording medium. Then, a cover layer having a thickness of 95 is formed on the recording layer forming surface.
A polycarbonate cover film having a thickness of μm was adhered using an ultraviolet curable resin (SD-523 manufactured by Dainippon Ink). At this time, the total thickness of the cover film and the ultraviolet curable resin was 100 μm.

Next, an optical head for a phase change recording medium was used, and a recording / reproducing experiment for this medium was tried through the cover layer. The laser wavelength of the optical head is 405 nm,
NA is 0.85. At the time of recording / reproducing, the address information and single
Got the sync signal from Wobble. Figure 13 shows the address detection
An address detection circuit equivalent to the above was used, and the threshold frequency of the frequency detector at that time was 1.05 MHz. A sync signal generation circuit corresponding to that shown in FIG. 10 was used to detect the sync signal. Recording and reproduction were performed using these, and it was confirmed that good recording and reproduction could be performed.

Example 9 In Example 9, as in Example 7, a polycarbonate resin substrate having an outer diameter of 120 mm, an inner diameter of 15 mm and a substrate thickness of 1.1 mm was used as the substrate. Further, a substrate having Wobble grooves formed by mastering in advance was used. The groove formed on the substrate has a depth of 40 nm and the groove width of the land portion / groove portion is 0.30 μm. This groove has a spiral shape, and the Wobble was formed so that the Wobble frequency was 280 kHz when the substrate was rotated at a linear velocity of 5.636 m / s from the inner circumference to the outer circumference.

At the innermost radius of 24 mm, 7492 Wobbles were formed per track, and at the outermost radius of 58 mm, 18,000 Wobbles were formed. Wo in radial direction
The maximum bble displacement was 12 nm. Further, the recording area of the recording medium was divided into 200 zones in the radial direction, and in each zone, a wobble was formed such that the land track and the groove track were aligned in the radial direction. On the other hand, the one-sided Wobble in which the address information is formed is formed every 64 kBytes in the form of FIG. The information "1" has four 1/2 cycles displaced toward the inner circumference side by 1.4MHz Wobble, and the information "0" has 1.4MHz.
Address information was recorded by combining four 1/2 cycles displaced toward the outer peripheral side by the Wobble.

On this substrate, as a recording layer, an AlTi reflective film, a first dielectric film made of ZnS-SiO2, a phase change recording film made of GeSbTe, and a second dielectric film made of ZnS-SiO2 were formed by sputtering from the substrate side. A body film was sequentially formed to prepare a phase change recording medium. Then, a cover layer having a thickness of 95 is formed on the recording layer forming surface.
A polycarbonate cover film having a thickness of μm was adhered using an ultraviolet curable resin (SD-523 manufactured by Dainippon Ink). At this time, the total thickness of the cover film and the ultraviolet curable resin was 100 μm.

Next, an optical head for a phase change recording medium was used, and a recording / reproducing experiment for this medium was tried through the cover layer. The laser wavelength of the optical head is 405 nm,
NA is 0.85. At the time of recording / reproducing, the address information and single
Got the sync signal from Wobble. Figure 14 shows the address detection.
An address detection circuit equivalent to the above was used, and a synchronization signal generation circuit corresponding to that in FIG. 10 was used to detect the synchronization signal. Recording and reproduction were performed using these, and it was confirmed that good recording and reproduction could be performed.

(Embodiment 10) In Embodiment 10, Embodiment 7
Similarly, a polycarbonate resin substrate having an outer diameter of 120 mm, an inner diameter of 15 mm and a substrate thickness of 1.1 mm was used as the substrate. Further, a substrate having Wobble grooves formed by mastering in advance was used. The groove formed on the substrate has a depth of 40 nm and the groove width of the land portion / groove portion is 0.30 μm. This groove has a spiral shape, and the Wobble was formed so that the Wobble frequency was 280 kHz when the substrate was rotated at a linear velocity of 5.636 m / s from the inner circumference to the outer circumference.

At the innermost radius of 24 mm, 7492 Wobbles were formed per track, and at the outermost radius of 58 mm, 18,000 Wobbles were formed. Wo in radial direction
The maximum bble displacement was 12 nm. Further, the recording area of the recording medium was divided into 200 zones in the radial direction, and in each zone, a wobble was formed such that the land track and the groove track were aligned in the radial direction. On the other hand, the one-sided Wobble in which the address information is formed is formed in the form of FIG. 4D every 64 kBytes. Four cycles of 1.50 MHz Wobbles were formed in the information "1", and four cycles of 1.30 MHz Wobbles were formed in the information "0", and address information was recorded by combining these.

On this substrate, as a recording layer, an AlTi reflective film, a first dielectric film made of ZnS-SiO2, a phase change recording film made of GeSbTe, and a second dielectric film made of ZnS-SiO2 were formed from the substrate side by a sputtering method. A body film was sequentially formed to prepare a phase change recording medium. Then, a cover layer having a thickness of 95 is formed on the recording layer forming surface.
A polycarbonate cover film having a thickness of μm was adhered using an ultraviolet curable resin (SD-523 manufactured by Dainippon Ink). At this time, the total thickness of the cover film and the ultraviolet curable resin was 100 μm.

Next, an optical head for a phase change recording medium was used, and recording / reproducing was attempted on this medium through the cover layer.
The laser wavelength of the optical head is 405 μm, and the NA of the condenser lens is 0.85. At the time of recording / reproducing, the address information and single Wobb are used by using the differential output of the two-division photodetector of the optical head.
Got a sync signal from le. An address detection circuit equivalent to that shown in FIG. 13 was used for address detection, and the threshold frequency of the frequency detector at that time was 1.4 MHz. A sync signal generation circuit corresponding to that shown in FIG. 10 was used to detect the sync signal. Recording and reproduction were performed using these, and it was confirmed that good recording and reproduction could be performed.

(Embodiment 11) In Embodiment 11, Embodiment 7
Similarly, a polycarbonate resin substrate having an outer diameter of 120 mm, an inner diameter of 15 mm and a substrate thickness of 1.1 mm was used as the substrate. Further, a substrate having Wobble grooves formed by mastering in advance was used. The groove formed on the substrate has a depth of 40 nm and the groove width of the land portion / groove portion is 0.30 μm. This groove has a spiral shape, and the Wobble was formed so that the Wobble frequency was 280 kHz when the substrate was rotated at a linear velocity of 5.636 m / s from the inner circumference to the outer circumference.

At the innermost radius of 24 mm, 7492 Wobbles were formed per track, and at the outermost radius of 58 mm, 18,000 Wobbles were formed. Wo in radial direction
The maximum bble displacement was 12 nm. Further, the recording area of the recording medium was divided into 200 zones in the radial direction, and in each zone, a wobble was formed such that the land track and the groove track were aligned in the radial direction. On the other hand, the one-sided Wobble in which the address information is formed is formed for each 664 kByte in the form of FIG. Information "1" has a positive phase wobble of 1.4MHz
In the information "0", wobbles of 1.4 MHz in antiphase are formed for four cycles, respectively, and these are combined to record the address information.

On this substrate, as a recording layer, an AlTi metal reflection film, a SiN underlayer protection film, TbFeC were formed from the substrate side by a sputtering method.
A magneto-optical recording medium was manufactured by sequentially forming a magneto-optical recording film and a SiN upper protective film. Next, a 95 μm-thick polycarbonate cover film as a cover layer was adhered to the recording layer-formed surface using an ultraviolet curable resin (SD-523 manufactured by Dainippon Ink). At this time, the total thickness of the cover film and the ultraviolet curable resin was 100 μm.

Next, an optical head for a magneto-optical recording medium was used to attempt recording / reproduction on this medium through the cover layer.
The laser wavelength of the optical head is 405 nm, and the NA of the condenser lens is 0.85. At the time of recording / reproducing, the address information and single Wobb are used by using the differential output of the two-division photodetector of the optical head.
Got a sync signal from le. An address detection circuit equivalent to that in FIG. 12 was used to detect an address, and a synchronization signal generation circuit equivalent to that in FIG. 10 was used to detect a synchronization signal. Recording and reproduction were performed using these, and it was confirmed that good recording and reproduction could be performed.

(Embodiment 12) In Embodiment 12, Embodiment 7
Similarly, a polycarbonate resin substrate having an outer diameter of 120 mm, an inner diameter of 15 mm and a substrate thickness of 1.1 mm was used as the substrate. Further, a substrate having Wobble grooves formed by mastering in advance was used. The groove formed on the substrate has a depth of 40 nm and the groove width of the land portion / groove portion is 0.30 μm. This groove has a spiral shape, and the Wobble was formed so that the Wobble frequency was 280 kHz when the substrate was rotated at a linear velocity of 5.636 m / s from the inner circumference to the outer circumference.

At the innermost radius of 24 mm, 7492 Wobbles were formed per track, and at the outermost radius of 58 mm, 18,000 Wobbles were formed. Wo in radial direction
The maximum bble displacement was 12 nm. Further, the recording area of the recording medium was divided into 200 zones in the radial direction, and in each zone, a wobble was formed such that the land track and the groove track were aligned in the radial direction. On the other hand, the one-sided Wobble in which the address information is formed is formed in the form of FIG. 4A every 64 kBytes. Information "1" has a positive phase wobble of 1.4MHz
In the information "0", wobbles of 1.4 MHz in antiphase are formed for four cycles, respectively, and these are combined to record the address information.

On this substrate, a TeSn alloy thin film was formed as a recording layer by sputtering to obtain a write-once recording film. Next, a cover layer having a thickness of 95 μm is formed on the recording layer forming surface.
The polycarbonate cover film of m was adhered using an ultraviolet curable resin (SD-523 manufactured by Dainippon Ink). At this time, the total thickness of the cover film and the ultraviolet curable resin was 100 μm.

Next, an optical head was used to attempt recording / reproduction on this medium through the cover layer. The laser wavelength of the optical head is 405 nm, and the NA of the condenser lens is 0.85. At the time of recording / reproducing, the address information and the synchronizing signal from the single Wobble were obtained by using the differential output of the two-division photodetector of the optical head. An address detection circuit equivalent to that in FIG. 12 was used to detect an address, and a synchronization signal generation circuit equivalent to that in FIG. 10 was used to detect a synchronization signal. Recording and reproduction were performed using these, and it was confirmed that good recording and reproduction could be performed.

Example 13 In Example 13, Example 7
Similarly, a polycarbonate resin substrate having an outer diameter of 120 mm, an inner diameter of 15 mm and a substrate thickness of 1.1 mm was used as the substrate. Further, a substrate having Wobble grooves formed by mastering in advance was used. The groove formed on the substrate has a depth of 40 nm and the groove width of the land portion / groove portion is 0.30 μm. This groove was spiral and formed 18,000 Wobbles per track from the inner circumference to the outer circumference of the substrate. The maximum amount of Wobble displacement in the radial direction was 12 nm. In addition, the wobble was formed so that the land track and the groove track were aligned in the radial direction.

The frequency of this Wobble is 140 kHz when rotated at 4.68 m / a at a radius of 24 mm, and 1 when rotated at 11.34 m / s at an outer circumference of 58 mm.
It becomes 40kHz. On the other hand, one-sided Wob that formed the address information
The ble is formed in the form of FIG. 4A every 64 kBytes. The information "1" is formed with a positive phase Wobble of 1.4 MHz, and the information "0" is formed with four cycles of a 11.4 MHz opposite phase Wobble, and these are combined to record address information.

On this substrate, as a recording layer, an AlTi reflective film, a first dielectric film made of ZnS-SiO2, a phase change recording film made of GeSbTe, and a second dielectric film made of ZnS-SiO2 were formed from the substrate side by a sputtering method. A body film was sequentially formed to prepare a phase change recording medium. Then, a cover layer having a thickness of 95 is formed on the recording layer forming surface.
A polycarbonate cover film having a thickness of μm was adhered using an ultraviolet curable resin (SD-523 manufactured by Dainippon Ink). At this time, the total thickness of the cover film and the ultraviolet curable resin was 100 μm.

Next, an optical head for a phase change recording medium was used, and recording / reproducing was attempted on this medium through the cover layer.
The laser wavelength of the optical head is 405 nm, and the NA of the condenser lens is 0.85. At the time of recording / reproducing, the address information and single Wobb are used by using the differential output of the two-division photo detector of the optical head
Got a sync signal from le. An address detection circuit equivalent to that in FIG. 12 was used to detect an address, and a synchronization signal generation circuit equivalent to that in FIG. 10 was used to detect a synchronization signal. Recording and reproduction were performed using these, and it was confirmed that good recording and reproduction could be performed.

Example 14 In Example 14, in order to confirm the effectiveness of the present invention, a recording / reproducing experiment was performed using the optical information recording medium of Example 1 and the optical information recording / reproducing apparatus of FIG. Then, the recording / reproducing operation was evaluated.

First, at the time of recording / reproducing, using only one side output of the two-division photodetector of the optical head, address information and single Wo
I tried to reproduce the sync signal from bble. Although an address detection circuit equivalent to that in FIG. 12 was used for address detection, address detection can be performed by increasing the gain of the amplifier in the recording / reproducing circuit 204 and narrowing the band limitation of the bandpass filter 2061a. It was Further, although a sync signal generation circuit corresponding to that shown in FIG. 10 was used to detect the sync signal, it was possible to obtain a good sync signal by increasing the gain of the amplifier in the recording / reproducing circuit 204.

(Embodiment 15) In Embodiment 15, Embodiment 1
Recording / reproducing experiments were performed using the optical information recording medium of No. 1 and the optical information recording apparatus of FIG. 9, and particularly, the detection of the sync signal was evaluated. First, when reproducing the address information block area, a gate signal for interrupting the synchronization signal detection in this portion was generated. Next, the circuit configuration is such that the differential output of the two-divided photodetector of the optical head is intermittently interrupted by the gate signal during recording and reproduction, and the synchronizing signal is obtained only from the single Wobble of the track other than the address information block.

When the sync signal was detected by using the sync signal generation circuit corresponding to that shown in FIG. 10, a good sync signal was obtained. In addition, since this synchronization signal is sampled and held and the synchronization signal here is complemented by using the synchronization signal of the area other than the address information block when reproducing the address information block portion, at which portion during the recording / reproducing operation. But it was never out of sync.

(Example 16) In Example 16, Example 1
In the same manner as in Example 5, the optical information recording medium of Example 1 and the optical information recording apparatus of FIG. 9 were used to evaluate the recording / reproducing operation, particularly the synchronization signal detection. First, at the time of recording / reproducing, an attempt was made to reproduce a synchronizing signal from a single Wobble by using the differential output of the two-division photodetector of the optical head. In this case, the bandpass filter that is provided in the Wobble detection circuit 205 and passes only the frequency of the single Wobble is set to be narrower than that in the first embodiment, and the synchronization signal corresponding to FIG. A generation circuit was used.

In this embodiment, the S / N drop of the Wobble signal at the time of reproducing the address information block can be suppressed to a minimum, and the generated sync signal is stable, so that the recording / reproducing can be performed well. .

The embodiments and examples of the invention of the present specification show only a part of the present invention, and various modifications can be made within the scope of the gist of the present invention. It goes without saying that the present invention can be broadly applied to a recording medium and an optical information recording / reproducing method and apparatus using this medium.

[0133]

As described above, according to the present invention, since the address information blocks including the address information are formed on the land track and the groove track so as to be displaced in the track direction, the signal processing circuit for address recognition can be simplified. It can be realized with a configuration. Further, since the Wobble having a constant cycle is formed in a portion other than the address information block, a stable synchronous clock can be extracted.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of an optical information recording medium of the present invention.

FIG. 2 is a diagram showing another embodiment of the optical information recording medium of the present invention.

FIG. 3 is a diagram showing an address recording unit of a conventional optical information recording medium.

FIG. 4 is a diagram showing an example of the shape of an address information block of the optical information recording medium according to the embodiment of FIG.

FIG. 5 is a diagram showing a comparison between a case where a land track and a groove track are in phase and a case where they are not in phase.

6 is a cross-sectional view showing a cross-sectional structure of the optical information recording medium according to the embodiment of FIG.

FIG. 7 is a diagram for explaining the principle of signal reproduction of the optical information recording medium of the present invention.

FIG. 8 is a diagram showing an example of an optical head used in the optical information recording / reproducing apparatus of the present invention.

FIG. 9 is a block diagram showing the configuration of an embodiment of an optical information recording / reproducing apparatus according to the present invention.

FIG. 10 is a block diagram showing an example of a synchronization signal generation circuit used in the optical information recording / reproducing apparatus of the present invention.

11 is a waveform diagram showing signals of respective parts of the synchronization signal generation circuit of FIG.

FIG. 12 is a block diagram showing an example of an address detection circuit used in the optical information recording / reproducing apparatus of the present invention.

FIG. 13 is a block diagram showing another example of the address detection circuit used in the optical information recording / reproducing apparatus of the present invention.

FIG. 14 is a block diagram showing still another example of the address detection circuit used in the optical information recording / reproducing apparatus of the present invention.

[Explanation of symbols]

1 substrate 2 recording layers 3 adhesive 4 cover layers 10 optical disc 20 optical head 21 Condensing lens 22 2-split photodetector 23 Laser light source 30 reflected light 31 Differential signal output 32 Sum signal output 51, 52 One-sided Wobble address information section 53 1/2 cycle Wobble (Wu) 54 1/2 cycle Wobble (Wd) Shared Wobble for 55 addresses 101 land truck 102 groove track 201 spindle motor 202 rotation control circuit 203 Servo control circuit 204 recording / reproducing circuit 205 Wobble detection circuit 206 address detection circuit 207 Recording data processing circuit 208 synchronization signal generation circuit 208a frequency divider 208b Phase comparison circuit 208c low pass filter 208d VFO 209 Playback data processing circuit 210 controller 211 interface 2061a bandpass filter 2061b Phase detector 2062a bandpass filter 2062b Frequency detector 2063a Low-pass filter 2063b Level comparator

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hideki Tanabe             5-7 Shiba 5-1, Minato-ku, Tokyo NEC Corporation             Inside the company (72) Inventor Masafumi Kubota             5-7 Shiba 5-1, Minato-ku, Tokyo NEC Corporation             Inside the company (72) Inventor Masaru Nakano             5-7 Shiba 5-1, Minato-ku, Tokyo NEC Corporation             Inside the company (72) Satoru Sugaya, Inventor             5-7 Shiba 5-1, Minato-ku, Tokyo NEC Corporation             Inside the company (72) Inventor Toshiaki Iwanaga             5-7 Shiba 5-1, Minato-ku, Tokyo NEC Corporation             Inside the company F-term (reference) 5D029 WA02                 5D090 AA01 BB04 CC01 CC04 CC14                       DD02 DD05 FF15 GG03 GG09                       GG27

Claims (14)

[Claims] 1. An optical information recording medium in which land tracks and groove tracks are alternately formed and information is recorded on both the land tracks and the groove tracks,
On one side wall of each of the land track and the groove track, an address information block containing address information is formed by meandering or unevenness, and the address information block in the land track and the address information block in the groove track are shifted in the track direction. An optical information recording medium, which is characterized by being arranged as follows. 2. An optical information recording medium in which land tracks and groove tracks are alternately formed and information is recorded on both the land tracks and the groove tracks.
On one side wall of each of the land track and the groove track, an address information block containing address information is formed by meandering or unevenness, and the address information block in the land track and the address information block in the groove track are shifted in the track direction. The optical information recording medium is characterized in that meanders having a constant period are formed on sidewalls of the land track and the groove track except for the address information block. 3. The optical information recording medium is a disk-shaped medium, and the recording area of the disk-shaped medium is divided into a plurality of zones in the radial direction, and the meandering of adjacent land tracks and groove tracks in the same zone is 3. The optical information recording medium according to claim 1, wherein the phases are substantially the same. 4. The phase of the address information block is 1
The optical information recording medium according to claim 1 or 2, wherein the optical information recording medium is composed of two kinds of combinations of meanders having a constant cycle different by 80 degrees. 5. The optical information recording medium according to claim 1, wherein the address information block is formed by combining two or more kinds of meanders having different periods. 6. The optical information according to claim 1, wherein the address information block is composed of a combination of different selected 1/2 cycle length partial waveforms of meanders having a constant cycle. recoding media. 7. The address information block is composed of a combination of two or more kinds of meanders in which the meandering cycle changes by a constant amount with respect to a reference cycle.
The optical information recording medium described in. 8. The optical information recording medium according to claim 1, wherein an address mark indicating that the address information is address information is provided at a head position of the address information block. 9. A method of recording information on or reproducing recorded information from the optical information recording medium according to claim 1, wherein the optical information recording medium is condensed on a track of the optical information recording medium. An optical information recording / reproducing method characterized in that a spot is formed and a meander of a track is detected by a change in intensity distribution of reflected light from the focused spot to detect address information and a sync signal. 10. An optical information recording / reproducing apparatus for recording information on or reproducing recorded information from the optical information recording medium according to claim 1. An optical information recording characterized in that a converging spot is formed on a track, and the meandering of the track is detected by the change of the intensity distribution of the reflected light from the converging spot to detect the address information and the synchronizing signal. Playback device. 11. An apparatus for recording or reproducing information on the optical information recording medium according to claim 1, wherein the apparatus is at least 2 in a track scanning direction of the recording medium. A photodetector that is divided and detects return light from the recording medium; a differential amplifier that detects a difference between sum signals of outputs of light receiving portions on both sides of the photodetector in the track scanning direction; An optical information recording / reproducing apparatus comprising: means for detecting address information based on a difference output detected by an amplifier. 12. An apparatus for recording information on or reproducing recorded information from the optical information recording medium according to claim 2, wherein the optical information recording medium is at least 2 in a track scanning direction of the recording medium. A photodetector that is divided and detects return light from the recording medium; a differential amplifier that detects a difference between sum signals of outputs of light receiving portions on both sides of the photodetector in the track scanning direction; An optical information recording / reproducing apparatus comprising: means for detecting address information and a synchronizing signal based on a difference output detected by an amplifier. 13. An apparatus for recording or reproducing information on the optical information recording medium according to claim 1, wherein the apparatus is at least 2 in a track scanning direction of the recording medium. Means for detecting address information based on an output of a photodetector that is divided and detects return light from the recording medium, and an output of one of the photodetectors on both sides of the photodetector in the track scanning direction. An optical information recording / reproducing apparatus comprising: 14. An apparatus for recording or reproducing information on the optical information recording medium according to claim 2, wherein the optical information recording medium is at least 2 in a track scanning direction of the recording medium. Address information and a synchronization signal are divided based on the output of one of the photodetectors that are divided and detect the return light from the recording medium and the photodetectors on both sides of the photodetector in the track scanning direction. An optical information recording / reproducing apparatus comprising: a detecting unit.