JP2001034948A - Optical disc control system and optical disc - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical disc control method whereby control data peculiar to discs can be given to the discs, without using a marking press. SOLUTION: An optical disc control method applied to this system is such that in initializing phase change type optical discs D1-D3, control data peculiar to the discs are given not so as to be erased in the data recording after initialization. The light intensity of an initializing laser beam is varied or its irradiation is intermitted to record the control data as a variation of the reflectivity of specified patterns a-c in the diametral or circumferential directions over data recording regions De of the discs D1-D3. In scanning over the discs after initialization, the variation of the reflected light quantity corresponding to the variation of the reflectivity of the patterns a-c is detected from reflected lights obtained from the data recording regions De, and the control data peculiar to the discs being scanned are read from the detected specified patterns a-c.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk management system for managing recording and reproduction of a disk using management data unique to the disk, and an optical disk.

[0002]

2. Description of the Related Art Conventionally, an optical disk management system assigns a management number to each disk, manages a large number of disks using the management number as a key, and records a large amount of software information (content information). In order to charge a fee for reading the specified content information by playing the disc, the management number and the content information to be played back are linked to accurately specify the content information to be charged, In order to prevent unauthorized copying of a disk, there is a disk system in which the authenticity of a disk is determined based on the presence or absence of the management number.

[0003]

In the above-described disk system, since a different management number must be assigned to each disk, from the disk manufacturer's point of view, the number of man-hours and costs for the disk manufacturing are reduced. There were additional drawbacks. This will be described with an example.

For example, as a recent high-density optical disk, D using a red laser beam having a wavelength of about 630 nm is used.
VD (Digital Versatile Disc) has appeared. This DVD-ROM has a merit that a fine information signal (signal track) is imprinted on a 0.6 mm-thick disk substrate and can be copied in large quantities. For DVDs having such a shape, there is a BCA (burst cutting area) standard as one of the DVD standards.

[0005] BCA refers to a method in which a high-power laser beam such as a YAG laser is used, and after a DVD is completed, in a specific area (BCA area) of the DVD disk substrate, a disc number corresponding to a different management number is assigned to each disc. Burn out into a bar code pattern that is linear in the diameter direction. Thus, a different management number is assigned to each DVD. Thereafter, when reproducing the DVD, by irradiating the reproduction laser beam onto the BCA code in the BCA area of the disk substrate, the amount of light reflected from the BCA code fluctuates greatly in a bar code pattern (from the portion not burned out). The reflected light amount (reflectance) is large, while the reflected light amount (reflectance) from the burnt-out portion is small. Different management numbers can be detected.

However, according to the system using the BCA standard, when a disc is manufactured, a new BC
Since it is necessary to purchase an A stamping machine, there is a disadvantage that the production cost is increased. It also has the disadvantage that the number of steps for engraving increases.

On the other hand, the above-mentioned BCA is used for DVDs.
-ROM but other DVD (DVD-R, D
VD-RW, DVD-RAM)
It is also effective for D. However, in the case of a recordable DVD, a recording condition test area (recording or reproducing laser beam output which is specific to a recordable DVD) is located at a recording start radius position of the disc where the BCA stamping machine exerts its effect. (For example, there is a PCA (power calibration area), RMA (record management area), etc.)
When the above-mentioned BCA code is recorded in this test area, the recording condition cannot be tested, and it is impossible to imprint the BCA code (that is, a different management number for each DVD). Further, even if such a recording condition test area is moved to another location, the cost disadvantage that the BCA stamping machine must be purchased and the disadvantage that the number of steps is increased can be solved. Not reached.

Therefore, the present invention has been made to solve the above-mentioned drawbacks, and when initializing a phase-change optical disk, management data unique to the disk is used when data is recorded after the initialization. By providing an optical disk management system that manages recording and reproduction of the disk using the management data by providing the disk with management so that the management data unique to the disk can be written to the disk without using the stamping machine. The purpose is to grant.

[0009]

In order to solve the above-mentioned problems, the present invention provides an optical disk management system and an optical disk having the following constitutions (1) to (5). (1) As shown in FIGS. 1 to 3, when initializing a phase-change optical disk D, an optical disk management system that manages recording / reproduction of the disk D using the management data by using the management data. An optical disk management system, wherein the management data is recorded on the disk D at the time of initialization by the light intensity of the initialization laser beam L whose light intensity is set higher than at the time of recording or reproduction. (2) As shown in FIGS. 1 to 3, when initializing the phase-change optical disk D, an optical disk management system that manages the disk-specific management data by using the management data to record and reproduce the disk D is used. At the time of initialization, the light intensity of the initialization laser beam L whose light intensity is set to be higher than that at the time of recording or reproduction (using the initialization laser beam irradiation device 3) is changed, or the irradiation of the laser beam L is intermittent. By doing so, (using the initialization condition control device 2) the management data is transferred to the specific pattern a over the diameter direction or the circumferential direction on the data recording area De on the disk D.
Recorded as a change in the reflectance of ~ c and recorded on the disk after initialization (recording / reproduction using an optical head or an optical pickup)
During scanning, a change in the amount of reflected light corresponding to a change in the reflectance of the specific patterns a to c is detected from the reflected light obtained from the disk D, and scanning is performed from the detected specific patterns a to c. An optical disk management system for reading management data unique to a disk. (3) As shown in FIGS. 1 to 3, an optical disk management system for managing management data unique to a disk by using the management data when initializing the phase change optical disk D. (Disk rotating device 1
By changing the linear velocity of the disk during initialization or by intermittently rotating the disk)
Initializing laser beam L whose light intensity is set to be higher than at the time of recording or reproduction during initialization over the diameter direction or circumferential direction on disk D (using initialization condition control device 2).
Is used to record the management data as a continuous or discontinuous change in the reflectance of the specific patterns a to c, and scan the disk after initialization (recording and reproduction using an optical head or an optical pickup). Then, a change in the amount of reflected light corresponding to a change in the reflectance of the specific patterns a to c is detected from the reflected light obtained from the disk D, and the specific patterns a to c are scanned from the detected specific patterns a to c. An optical disk management system characterized by reading management data of the optical disk. (4) As shown in FIGS. 2 and 3, a phase-change optical disk used in the optical disk management system according to any one of claims 1 to 3, wherein the disk D is initialized after being initialized.
An optical disc characterized in that management data unique to the disc is recorded as a change in the reflectance of a specific pattern in the upper diameter direction or circumferential direction. (5) The optical disk according to claim 4 is a CD-RW, D
An optical disc characterized by being one of VD-RAM and DVD-RW.

Further, the present invention can provide the following optical disk management methods (A) to (F), a disk management number assigning method, an optical disk optical disk, and a disk management information system. (A) An optical disc management method for assigning a disc management number to a data recording area of each phase change optical disc having a phase change recording film laminated on a substrate,
In the disk initialization process of crystallizing a phase-change optical disk in an amorphous state and in an unrecorded state, by changing the intensity of the initialization laser beam or stopping the laser beam intermittently, the disk diameter direction Alternatively, the management number is given by giving a change in the amount of reflected light that is continuous or discontinuous in the circumferential direction. (B) In a recordable optical disk in which recording is performed by changing the crystalline state of a recording material, after the recording film is formed on the optical disk substrate, the recording medium is initialized in the recording medium initialization step. A method for assigning a management number to an optical disc, characterized by giving a continuous or discontinuous change in the amount of reflected light in the radial or circumferential direction of the disc by changing the linear velocity or intermittently stopping the rotation. . (C) In a recordable optical disk in which recording is performed by changing the crystalline state of a recording material, in a recording medium initialization step after a recording film is formed on an optical disk substrate, the reproduction track direction of the recording disk is An optical disc management number assigning method, wherein initialization is performed in a fluctuating manner. (D) An optical disk obtained by performing the operations of claims 1 to 3, wherein the variation of the reflectance of the unrecorded disk has a peculiar pattern in one round of the disk. (E) An optical disc management information system having a detecting means for detecting, as information, a fluctuation of a reproduction output signal obtained at the time of reproduction in a recordable optical disk in which recording is performed by changing a crystal state of a recording material. (F) An optical disk management information system for identifying a disk and controlling playback of the disk based on the information detected by the system of (E).

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An optical disk management system and an optical disk according to the present invention will be described below.

FIG. 1 is a diagram for explaining an optical disc recording / reproducing apparatus used in the optical disc management system of the present invention, and FIGS. 2 and 3 are diagrams for explaining a state of the optical disc of the present invention after initialization. FIG. 4 is a reproduction output waveform diagram when the optical disc of the present invention is in an unrecorded state after initialization, FIG. 5 is a reproduction output waveform diagram when the optical disc of the present invention is initially recorded, and FIG. FIG. 7 is a signal output waveform diagram obtained by extracting a reflectance signal, FIG. 7 is an envelope detection output waveform diagram, FIG. 8 is a diagram showing a main part of a signal processing circuit, and FIG. 9 is a diagram for explaining an example of initialization of the optical disk of the present invention. It is.

As will be described later, the optical disk management system of the present invention assigns, when initializing a phase-change optical disk, management data unique to the disk so as not to be erased when data is recorded after the initialization. Is an optical disk management system for managing recording and reproduction of a disk by using the management data. Then, by changing the light intensity of the initialization laser beam or by interrupting the irradiation of the laser beam, the management data is transferred in the diametrical or circumferential direction on the phase-change optical disk (for example, on the data recording area). It is recorded as a change in reflectance of a specific pattern. Then, when scanning the disk after the initialization, from the reflected light obtained from the disk, a change in the amount of reflected light corresponding to a change in the reflectance of the specific pattern is detected. This is for reading out management data unique to the disk being scanned.

The optical disk management system according to the present invention is the above-described optical disk management system, wherein the optical disk management system changes the linear velocity of rotation of the disk during initialization or interrupts the rotation of the disk so that the disk (for example, The management data is recorded as a continuous or discontinuous change in reflectance of a specific pattern over the diameter direction or the circumferential direction of the data recording area). Then, when scanning the disk after the initialization, from the reflected light obtained from the disk, a change in the amount of reflected light corresponding to a change in the reflectance of the specific pattern is detected. This is for reading out management data unique to the disk being scanned.

Further, the optical disk of the present invention is a phase change type optical disk used in the above-mentioned two optical disk management systems, and after being initialized, is directed in a diameter direction or a circumferential direction on a data recording area of the disk. All over the disk, management data unique to the disk is recorded as a change in reflectance of a specific pattern. Furthermore, the optical disk of the present invention is a CD-RW, DVD-RAM, DV
This is a phase-change optical disk that is either D-RW or PD.

The inventors of the present invention have studied whether the above-mentioned method of assigning a different management number to each disc, which is called a BCA code, can be applied more simply and whether it can be applied to a recordable disc. Thus, the present invention can be disclosed.

First, in order to explain the optical disk of the present invention, PD, CD-RW, DVD-RAM,
A method of manufacturing a disc that is a recordable optical disc using a series of phase change recording media such as a DVD-RW will be described. In this description, the effectiveness of the present invention is also described. These recordable optical disks are manufactured by performing the same steps up to the intermediate steps as those of a read-only optical disk which is a DVD-ROM. (Method of Manufacturing Optical Disc) (1) First, a laser beam for cutting is irradiated from a cutting machine onto a glass disk on which a thin resist is applied on the entire surface, and a spiral groove (groove) is formed at a predetermined track pitch. Record and form. (2) Next, a spiral groove is deposited on the glass plate as a change in shape by passing through a developing step. (3) Next, a thin nickel conductive film is formed on the resist-coated glass master, nickel-plated in a wet nickel plating bath, and the finished nickel disk is cut into a predetermined size. Obtain a metal master. (4) Next, a mold for molding an optical disk is mounted on an injection molding machine, the metal master is mounted in the mold, and polycarbonate resin or the like is injection-molded to obtain a disk substrate.
The disc substrate is usually 120 mm in diameter, and the CD-R
If W, the thickness is 1.2 mm, DVD-RAM, DV
In the case of D-RW, the thickness is 0.6 mm. A spiral groove is formed on the surface of the formed substrate. (5) Next, a step of applying a recording film on the formed disk substrate is performed. The disk substrate is placed in a vacuum film forming apparatus for applying a recording film. CD-RW, DVD-R
In AM, DVD-RW, and the like, a dielectric film containing zinc sulfide or the like as a component is formed as a first layer on a disk substrate in a vacuum film forming apparatus. Thereafter, a recording film containing antimony, tellurium, or the like as a component is formed as a second layer on the first layer. (6) Next, a dielectric film containing zinc sulfide or the like as a component is formed again as a third layer formed on the recording film. Then, a metal reflection film of aluminum or the like is formed as a fourth layer on the third layer. In this way, the dielectric film, the recording film, the dielectric film, and the metal reflection film are sequentially laminated on the disk substrate to complete the disk. (7) Thereafter, in addition to these four layers, between the first layer and the second layer, or between the second layer and the third layer, for the purpose of increasing the sensitivity of the recording film and improving the performance of repeated recording. A new layer may be provided between the layers, between the third layer and the fourth layer, and may have a five-layer structure or a six-layer structure as a whole. Further, for a next-generation high-density recording optical disk, in the case of a DVD-RAM for two-layer recording, when the fourth layer metal reflection film is not used, or in the fourth layer, the fourth layer has high thermal conductivity and high transparency. In some cases, a semiconductor such as silicon carbide is formed. (8) After the recording film is formed, in the case of a single-plate type DVD such as a CD, a protective film made of an ultraviolet curable resin is applied on the recording film to a thickness of about 5 μm, and ultraviolet light is applied to the protective film. The cured resin is cured to form a protective film. A label layer is formed thereon. The label layer prints, for example, characters such as “DVD-RW” as the content information of the disc and the name of the manufacturer. In the case of a bonding type such as a DVD, a disk substrate (also referred to as a dummy disk) having the same diameter and the same thickness as the disk disk on which the recording film is formed is prepared and, for example, an adhesive is formed on the recording film. An ultraviolet curable resin is applied as an agent, a dummy board is overlaid, and bonded using a spinner or the like (2P method). (9) After bonding, the surface of the disk adhesive is irradiated with ultraviolet rays in order to cure the ultraviolet curing resin as the adhesive. Thereafter, label printing is performed on the non-reproducing surface side (dummy board side) of the disk. Furthermore, blue laser light (wavelength 400n)
m) is a next-generation high-density disk typified by an optical disk for recording / reproducing by using m) and a high-density disk having a numerical aperture of about 0.8 of the objective lens of the optical head. A disk is obtained by forming each functional film in the reverse order to that described above on the prepared disk substrate (substrate thickness 1.2 mm). That is, first, the above-mentioned reflective film as the fourth layer is formed on the injection-molded disk substrate, then the dielectric layer as the third layer, the recording film as the second layer, and finally the first layer. It is formed by sequentially forming dielectric layers as layers. Then, for example, a UV curable resin is applied to a thickness of about 0.1 mm on a dielectric layer which is a first layer formed as a last layer by a spinner or the like, and cured with UV to form a read / write surface for recording / reproducing. It is. In this case, the label area of the disc is on the surface of the injection molded substrate on which the spiral recording groove is not formed.

Next, the recording film of the recordable optical disk prepared by the above procedures (1) to (9) is initialized.

In the initialization of the recording film, if the recording film remains formed, the recording film is in an amorphous state (amorphous state), and good recording cannot be performed. For this reason, a good recording can be performed by irradiating the entire surface of the recording film with a high-power initialization laser beam and performing initialization for crystallization of the amorphous recording film by the heat of the laser beam. . In a data recording area in which initialization has been performed, when this area is irradiated with a reproduction laser beam, the reflectance is generally improved as compared with an area in which data has not been initialized. Since the reflectivity increases as a laser beam with a large output is irradiated at the time of initialization, the recording conditions for recording information vary greatly depending on the initialization conditions (the magnitude of the output of the initialization laser beam). do. By performing such initialization of the recording film, the recordable optical disk has a recording function for the first time. In the present invention, the initialization step has been described as being performed before label printing, but may be performed after label printing.

Information can be recorded for the first time on a recordable optical disk that has been initialized. The recording of information is performed by a recording device (not shown). When a recording laser beam is applied to the initialized recording film of the recordable optical disc to record information, the crystalline recording film becomes amorphous. Are formed, and a place (mark) having a lower reflectivity than the surrounding (space) in a crystalline state is formed, and becomes information called a mark. On the other hand, when the recording laser beam is not irradiated, there is no change in the recording film, the same reflectance as that at the time of initialization is maintained, and the information becomes information called space. When rewriting information on a recording film on which a mark is formed, an overwrite recording condition is applied. These overwrite recording conditions are thought to be such that the recording film once reaches the crystallization temperature, undergoes various processes, and is rewritten into a mark or a space under the output conditions of the recording laser beam during recording. Have been.

The step of initializing the recording film is not as simple as applying heat with a laser beam.
It is characterized in that the recording characteristics of the recordable optical disk change significantly depending on how heat is applied. The present invention has been made by paying attention to the fact that the recording characteristics of a disc change depending on such initialization conditions of the recording film.

As described above, satisfactory information cannot be recorded unless the recording film of the phase-change recording disk which is a recording type optical disk is initialized. A recording device (not shown) for recording data on such a phase-change recording disk uses an intensity of a recording laser beam during recording and an irradiation time of the laser beam so as to obtain a satisfactory recording state on the phase-change recording disk. Are predetermined. The predetermined recording conditions of the laser beam include the conditions in the laser recording sequence stored in a storage circuit (memory) built in the recording machine, and the optimum recording conditions for each disc for each disc. This is a condition when recording is performed according to a recording sequence of a laser recorded in the inside.

Since the recording conditions in such a recording machine are determined on the assumption that the disk has already been initialized, an uninitialized disk will have a sufficient amount on the recording film of the disk. No record of the state is made. That is, the output power of the initialization laser beam used at the time of initialization is higher than the output power of the recording laser beam used at the time of recording. For this,
If there is an uninitialized area on the disc, the uninitialized area will be initialized even if the optical disc has been rewritten many times with the recording laser beam (repeated recording). This shows that the location and length information of the unoccupied places will be kept.

Similarly, a laser beam for initialization is applied in excess of the irradiation intensity at the time of normal initialization, and excessive initialization (initialization is performed with 1.5 to 2 times the power of an appropriate power). ), It is not possible to sufficiently reduce the reflectivity so that the data can be recorded satisfactorily even if data is to be recorded on the disk, and satisfactory recording cannot be performed. This state has a feature that this state is maintained even after a state in which data is rewritten many times on the disk. Therefore, in order to perform good recording over the entire surface of the disk (for example, the data recording area), the initialization conditions (output intensity and irradiation power of the initialization laser beam) must be uniform over the entire surface of the disk. . Here, the outputs of various laser beams are compared as follows.

Excessive initialization laser beam output> Normal initialization laser beam output> Recording laser beam output> Reproduction laser beam output The optical disk management system of the present invention uses initialization conditions (initialization laser beam If the irradiation intensity) is different, the above-mentioned optical disc management number (ID code) is used by positively utilizing the phenomenon that the difference in the initialization condition remains without disappearing even if information is rewritten many times on the disc. ) Was used for recording.

In the first embodiment of the optical disk management system according to the present invention, information on a management number unique to a disk is recorded as a unique pattern based on a change in reflectance during one round of the disk. For example, the position on the disk that has not been initialized and its length, or the position on the disk that has been excessively initialized (initialized with 1.5 to 2 times the power of the appropriate power) If the length and the length are made different for each disc, the position and the length can be used as information so that a management number unique to the disc can be obtained.

However, if the initialization is performed with an excessively high intensity of the laser beam irradiated by the initialization laser beam such that the spiral groove for recording is deformed, the tracking guide adjacent to both sides of the spiral groove for recording may be used. Since the groove for use is deformed and satisfactory tracking cannot be obtained at the time of recording information or the like, excessive initialization must be performed within a range where the groove shape is not deformed. If there is a place that has not been initialized or a place that has been over-initialized, when trying to record information on a disc, the place that has not been initialized will be the place where the initialization is being performed. The reflectance is lower than that of. As a result, the reflectance fluctuation during one round of the disk has a peculiar pattern. By detecting this peculiar pattern, the information of the disk management number can be read.

More specifically, at the time of recording, the output fluctuation of the push-pull signal for obtaining the tracking error detection signal (that is, the output fluctuation of the push-pull signal obtained from the disk on which the information of the disk management number is not recorded) is obtained. Is significantly larger or smaller (for example, by envelope detection), it is possible to read out the information of the disk management number. Therefore, even when recording is performed on an unrecorded disk for the first time, the management number can be read from the tracking signal.

A second embodiment of the optical disk management system according to the present invention is a development of the first embodiment described above, and includes initialization conditions (irradiation intensity of the initialization laser beam).
Using the phenomenon that the recording condition of the disc changes, the scanning positions of the initialization laser beam partially overlap (that is, are initialized once and then further initialized), and the information of the disc-specific management number is obtained. Is recorded as a peculiar pattern based on the fluctuation of the reflectance during one round of the disk. For example, in general, the spot shape of the initialization laser beam on the disc is a strip extending in the diameter direction of the disc. The use of a laser beam extending in the form of a strip in the diameter direction while rotating the disk enables initialization of several tracks at a time, and is widely used because the efficiency of the initialization can be improved.

When an initialization laser beam having such a shape is used, if a strip-shaped end is set to overlap when the next disk rotation period comes, a certain track is initialized twice. Since the recording has been performed (that is, it has been initialized once and then further initialized), and the initialization state is different from other tracks, when information is recorded on the disc,
Tracks that have been initialized twice exhibit peculiar phenomena, such as an increase or decrease in the output signal during disc playback, as compared to other tracks. At this time, the laser beam for initialization is adjusted to the number of rotations of the disk, or by slightly varying at a specific cycle in the diameter direction of the disk in accordance with the linear velocity at the time of initialization of the disk,
After recording information on the disc and playing back the recorded information,
It can be seen that the output of the reproduction signal is amplitude-modulated at the fluctuation period of the initialization laser beam at the time of disk initialization.
By extracting the amplitude-modulated reproduction output fluctuation by envelope detection, it can be used as disc management information. Also in this case, even after the information on the disk is rewritten many times, the output fluctuation of the reproduced signal does not change, so that it is optimal as management information.

Specific examples of the first and second embodiments of the optical disk management system of the present invention described above are as follows.
That is, as shown in FIG.
e, on each track (spiral groove) g, an uninitialized area a,
The proper initialization area b and the excessive initialization area c are formed alternately in the radial direction and have the same length. Since the disk D1 shown in FIG. 2 is a CLV (constant linear velocity) type disk, the uninitialized area a, the properly initialized area b, and the excessively initialized area c are located on the same radial line (at the same position). Absent.
Further, as shown in FIG. 3, the data area D of the disk D2 is
On e, uninitialized areas a, proper initialized areas b, and excessively initialized areas c are formed alternately in the radial direction and have the same length. Since the disk D2 shown in FIG. 3 is a CAV (constant angular velocity) type disk, the uninitialized area a, the properly initialized area b, and the excessively initialized area c are located on the same line (same position) in the radial direction. . In this manner, a specific pattern using the uninitialized area a, the properly initialized area b, and the excessively initialized area c is formed over the entire surface of the disk D according to the management number unique to the disk. As a result, the reproduced waveform based on the reflected light obtained by irradiating the initialized disks D1 and D2 with the ordinary recording laser beam or the reproducing laser beam has a step-like shape as shown in FIG. Become. In FIG. 4, the waveform portion a1 corresponds to the disks D1, D
2 shows a reproduction signal output based on reflected light obtained by irradiating a normal recording laser beam or a reproduction laser beam on the uninitialized area 2 of FIG. Similarly, waveform portions b1 and c1 indicate reproduced signal outputs based on the reflected lights of the proper initialization area b and the excessive initialization area c, respectively.

FIG. 5 shows the initial data recording after the initialization in the uninitialized area a, the proper initialized area b, and the over initialized area c of the disks D1 and D2 using a normal recording laser beam. 3 shows a reproduction signal output based on the reflected light when the above operation is performed. In FIG. 5, the waveform portion a2 is the disk D1,
The data is recorded by irradiating a normal recording laser beam onto the uninitialized area a of D2, and the reproduced signal output based on the reflected light obtained by this is shown. Similarly,
Waveform portions b2 and c2 indicate reproduced signal outputs based on the reflected light from the proper initialization area b and the excessive initialization area c, respectively.

Further, as a third embodiment of the optical disk management system according to the present invention, the information of the management number unique to the disk is changed by changing the output of the initialization laser beam due to the unevenness of the initialization state during one round of the disk. This is recorded as a peculiar pattern based on the resulting change in reflectance.

Furthermore, as a fourth embodiment of the optical disk management system of the present invention, the rotation speed of the disk may be changed at the time of initialization without changing the output of the laser beam for initialization. By temporarily stopping the rotation of the disk, the information of the management number unique to the disk is recorded as a unique pattern based on the reflectance fluctuation of the reflectance caused by the unevenness of the initialization state during one round of the disk. These series of operations have a feature that the management information in the disk can be read by recording the information signal on the disk by changing the initialization condition of the disk in the rotation direction of the disk.

Specific examples of the third and fourth embodiments of the optical disk management system of the present invention are as follows.
That is, as shown in FIG.
On each track (spiral groove) g on e, the output of the laser beam for initialization is periodically changed and initialized. Thus, the condition at the time of initialization is changed. FIG.
Middle and shaded portions indicate portions that are difficult to be initialized.

A fifth embodiment of the optical disk management system according to the present invention is as follows. That is, the recorded data information has two recordable locations inside and outside of a spiral groove like a DVD-RAM, so-called land-groove recording method. And a groove recording method of recording recording information in a spiral groove as represented by a CD-RW or a DVD-RW. The method described hereafter is a method that can achieve particularly good effects in the groove recording method.

First, in the initializing step, one or several tracks of the spiral groove (groove) are not initialized or are excessively initialized. Or 1
The initialization may not be performed intermittently within the track or may be excessively initialized. Then, when information is recorded in this state, it is not possible to form a satisfactory recording mark as compared with a groove in which normal initialization is performed, but some recording is possible. However, at locations outside the groove where recording is not sufficiently performed (specifically, at lands), it is difficult to form marks, so that the reflectance remains low or high. In such a track, even if rewriting is performed many times, recording on the land portion is not sufficiently performed, so that the land portion has low or high reflectance. When such a track is reproduced, a reproduction output different from that of the other tracks is obtained. For example, when a track that has not been initialized is reproduced, a relatively large reproduction output and a signal obtained by inverting the reproduction output of the mark and the space are obtained, and a relatively small signal output is generated at the position where the initialization is performed. Normal reproduction output of marks and spaces can be obtained.

In the case of excessive initialization, a mark is not formed normally at the time of recording, so that a smaller signal output can be obtained. Therefore, if the playback output is detected by envelope detection,
An envelope detection output corresponding to a change in the initialization condition is obtained. If the period or time of the initialization presence / absence area is used as information, the information can be extracted from the envelope detection output. It is also possible to use it as an information signal by detecting a DC component as a reflectance component of the output from the optical head instead of the envelope detection. A similar effect can be obtained by changing the laser beam output at the time of initialization within the track, not by the presence or absence of the initialization change area.

The fluctuation of the initialization condition is preferably set to a period of, for example, 10 kHz or more so as not to affect the tracking performance of the recording device when information is recorded on the disk by the disk recording device. In order not to interfere with the reproduction mark information, it is desirable that the length of the recording mark is at least twice as long as the longest recording mark, for example, at least 10 μm.

6 and 7 are obtained from the signal output obtained from the optical head by a detection method, and the output is led to a comparison circuit having a configuration shown in FIG. You can do it. Using information obtained by this signal processing (detecting the envelope detection signal output at three levels a4, b4, and c4), it can be used as key information for reproducing the disks D1 and D2. I can do it. For example, a disc for which the key information is not selected is discriminated as an illegally copied disc, and the disc is managed so that recording or reproduction is disabled.

That is, the reproduced signal output waveform has a stepped shape as shown in FIG. In FIG. 6, a waveform portion a3 represents a reproduced signal output (reflectance signal) based on reflected light obtained by irradiating a normal recording laser beam or a reproducing laser beam onto the uninitialized areas a of the disks D1 and D2. Is shown. Similarly, waveform portions b3 and c3 indicate reproduced signal outputs based on the reflected lights of the proper initialization area b and the excessive initialization area c, respectively.

FIG. 7 shows an envelope detected signal output waveform obtained by performing envelope detection on the reproduced signal output waveform shown in FIG. The reproduction signal output based on the reflected light when the first data recording is performed after the initialization using a normal recording laser beam is shown in the excessive initialization area c. In FIG. 7, a waveform portion a4 indicates an envelope detection signal output obtained by performing envelope detection on the waveform portion a3. Similarly, the waveform portions b4 and c4 respectively correspond to the waveform portions b3 and c3.
2 shows an envelope detection signal output obtained by performing envelope detection on.

The comparison circuit 10 having the configuration shown in FIG.
Is the reflectance signal (waveform portions a3, b3, c3 (FIG. 6))
Is a circuit for reading the key information a5, b5, and c5 by performing envelope detection on the input terminal 10a to which the reflectance signals a3, b3, and c3 are supplied, an envelope detection circuit 10b, a signal DC output, or an envelope detection. The envelope detection output a4 of the circuit 10b
Switch 10c for selecting b4 and c4, switch 10c
And the reference voltage E are supplied to output the key information c5. The comparator 10d outputs the key information c5. The output of the switch 10c and the voltage obtained by dividing the reference voltage by the resistors R1 to R3 are supplied to output the key information b5 and a5. Comparator 10e, 1
0f.

Various information can be recorded in the disk by changing the intensity of the initialization laser beam at the time of initialization of the disk and the irradiation position on the disk. Can be used as key information for decrypting the management number for each disk or the information in the disk. In addition, since this information can be handled in the disk initialization device, there is no need to purchase a new information recording device, no additional information recording process is required, and low-cost, high-quality An appropriate management number can be assigned to the optical disc.

Next, a specific embodiment of the optical disk of the present invention will be described. (Example 1) Guide grooves (grooves) were formed in advance (track pitch 0.74 μm, groove depth 30 nm)
While the 0.6 mm thick polycarbonate disk substrate is planetary rotating at 60 revolutions per minute, by sputtering,
Vacuum film formation was performed in which the first dielectric layer (dielectric film), the recording layer (recording film), the second dielectric layer (dielectric film), and the reflection layer (reflection film) were stacked in this order.

The details are as follows. (1) First, the inside of the vacuum chamber was evacuated to 6 × 10 -5 Pa, and then 1.6 × 10 -1 Pa Ar gas was introduced. (2) Next, ZnS to which 20 mol% of SiO2 was added
With a film thickness of 7 on the substrate by high-frequency magnetron sputtering.
A 1 nm first dielectric layer was formed. (3) Subsequently, a four-element single target composed of Sb, Te, Ag, and In was sputtered by a DC power supply to form a film having a thickness of 20 n.
m recording layers were formed. The composition of the obtained recording layer is Ag
21n6 Sb63 Te29 (at%). (4) Further, a second dielectric layer of 17 nm of the same material as that of the first dielectric layer is formed to a thickness of 17 nm.
A two-element single target made of Ti was formed by a DC sputtering method to a composition of Al98,2T11,8 (at%) with a thickness of 150 nm.
Was formed. (5) After taking out this disk from the vacuum chamber, an acrylic ultraviolet curable resin (XR manufactured by Sumitomo Chemical Co., Ltd.)
11) was spin-coated and cured by irradiation with ultraviolet rays to form a protective resin layer having a thickness of 6 μm, thereby obtaining an optical recording medium of the present invention. Further, a slow-acting ultraviolet curable resin was applied on the protective film by using a screen printing method, and disks formed in the same manner were bonded and pressed and cured to produce a double-sided disk.

The optical disk thus manufactured was initialized by using an initialization apparatus as shown in FIG. Initialization device A
Has a disk rotating device 1 for rotating the optical disks D1 to D3, from which information about the number of rotations is sent to the initialization control device 2. The initialization laser beam L is incorporated in the initialization laser beam irradiation device 3,
The beam intensity information of the laser beam L and the radius information of the optical disc D irradiated by the laser beam L are sent to the initialization condition control device 2. The shape of the laser beam L for initialization is a spot shape in which the beam width in the track direction is narrower than the radial direction (beam shape = 1 μm in tangential direction × 20 in radial direction).
μm) to irradiate a wide-beam laser beam,
The recording film was heated to a temperature higher than the crystallization temperature to perform an initialization process.

The optical disks D to D3 were rotated at a linear velocity of 2 m / s, and the entire disk was initialized from the inner circumference to the outer circumference at a feed speed of 10 μm per rotation. The initializing laser beam output was set to the optimum power of 120 mW. At this time, the innermost peripheral portion of the disk D is not initialized, but is kept in an amorphous state as it was at the time of film formation.
The control number was recorded by modulating the initialization laser beam L based on the information from. The recording of the disc-specific management number is performed at a linear velocity of 1 m / s, the output of the initialization laser beam L is set to an excessive 160 mW, and the initialization condition is changed.
A disc recorder was turned on and off at 10 to 50 kHz so as not to affect the tracking state at the time of disc reproduction, thereby forming a region in which radially crystallized portions and amorphous portions were mixed in the radial direction. .

The discs D to D3 were recorded and reproduced using an optical disc drive tester (DDU1000) manufactured by Pulstec, equipped with a laser diode having a wavelength of 639 nm and an objective lens having a numerical aperture of NA = 0.60. Recording was performed from the disk substrate side into guide grooves (grooves are convex when viewed from the direction of incidence of the laser beam). In the control number area, the recording layer is shifted to the crystallized state at the position irradiated with the initialization laser beam L, the reflectivity is high, and the unirradiated position remains in the amorphous state and the reflectivity is low. Since there is a change in the reflectivity, it was possible to read the management number information as the output change of the reproduction signal. (Example 2) After initializing the optical disk D manufactured in the same manner as in Example 1 under the above-mentioned optimum conditions, excess power was repeatedly applied to the initialized portion to record the management number information. The optical disks D to D3 were rotated at a linear velocity of 2 m / s, and the entire disk was initialized from the inner circumference to the outer circumference at a feed speed of 10 μm per rotation by the initialization condition device 2 equivalent to that of the first embodiment. The initializing laser beam output is the optimum power 12
It was set to 0 mW. Then, the management number area is a rotation speed of 1 m / s in the proper initialization portion, the output of the initialization laser beam is set to an excess of 160 mW, and the initialization laser beam is turned on and off at 10 to 50 kHz. It was formed by mixing a crystallized portion having a high reflectivity and a crystallized portion having a low reflectivity in a radial direction.
The portion where the laser beam L for initialization is excessively irradiated is where the recording layer transitions to a state of high crystallinity, the reflectance is higher,
On the other hand, the portion irradiated with the appropriate power has a lower degree of crystallinity than the crystalline state and a lower reflectance. It was possible to read the management number information as the change in reflectance.

When recording is performed on this area using a predetermined strategy, satisfactory recording cannot be performed at a location where the initialization laser beam L is excessively irradiated, and good recording can be performed at a location where the proper power is irradiated. It was possible. Even after recording, the portion irradiated with excess power had a high reflectance, and the reflectance varied. Therefore, it was possible to read the management number information from the fluctuation of the amplitude of the reproduction signal.

[0051]

As described above, according to the present invention, there is provided an optical disk management system capable of giving disk-specific management data to a disk without using a stamping machine as in the conventional disk method. be able to.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining an optical disk recording / reproducing device used in an optical disk management system of the present invention.

FIG. 2 is a diagram for explaining a state after initialization of the optical disc of the present invention.

FIG. 3 is a diagram for explaining a state after initialization of the optical disc of the present invention.

FIG. 4 is a reproduction output waveform diagram when the optical disc of the present invention is in an unrecorded state after initialization.

FIG. 5 is a reproduction output waveform diagram at the time of initial recording on the optical disc of the present invention.

FIG. 6 is a signal output waveform diagram obtained by extracting a reflectance signal from the optical disc of the present invention.

FIG. 7 is an envelope detection output waveform diagram.

FIG. 8 is a diagram illustrating a main part of a signal processing circuit.

FIG. 9 is a diagram illustrating an example of initialization of the optical disc of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 disk rotating device 2 initialization condition control device 3 initialization laser beam irradiation device a to c specific pattern D1 to D3 phase change optical disk, optical disk De data recording area L initialization laser beam

Claims (5)

[Claims] 1. An optical disk management system for managing management data unique to a disk at the time of initializing a phase change optical disk using the management data. An optical disk management system, wherein the management data is recorded on a disk by the light intensity of an initialization laser beam whose light intensity is set to be higher than at a time. 2. An optical disk management system for managing management data unique to a disk when the phase change type optical disk is initialized by using the management data. By changing the light intensity of the initialization laser beam whose light intensity is set to be larger than the time or by interrupting the irradiation of the laser beam, the management data is converted into a specific pattern over the diameter direction or the circumferential direction on the disk. Recorded as a change in reflectivity, and when scanning on the disk after initialization, a change in the amount of reflected light corresponding to a change in the reflectivity of the specific pattern is detected from reflected light obtained from the disk. An optical disk management system for reading management data unique to a disk being scanned from a detected specific pattern. 3. An optical disk management system for initializing a phase-change optical disk, wherein the disk-specific management data is managed by using the management data to control recording and reproduction of the disk. By changing the linear velocity or interrupting the rotation of the disk, using an initializing laser beam whose light intensity is set to be larger than that at the time of recording or reproduction at the time of initialization over the diameter direction or circumferential direction on the disk. Then, the management data is recorded as a continuous or discontinuous change in reflectance of a specific pattern, and when scanning on a disk after initialization, the reflectance of the specific pattern is calculated from reflected light obtained from the disk. Detecting a change in the amount of reflected light corresponding to the change in the data, and reading management data specific to the disk being scanned from the detected specific pattern. Disk Management System. 4. A phase-change optical disk used in the optical disk management system according to claim 1, wherein the optical disk is initialized in a diametrical or circumferential direction on the disk after being initialized. An optical disc, wherein management data unique to the disc is recorded as a change in the reflectance of a specific pattern. 5. An optical disk according to claim 4, wherein the optical disk is a CD-R.
An optical disc characterized by being one of W, DVD-RAM, and DVD-RW.