JP2004039014A - Hybrid optical disk and its drive for reproduction - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hybrid optical disk, in which the write once is allowed for only an original hybrid optical disk but not allowed for the hybrid optical disks other than the original, and to provide its drive for reproduction. <P>SOLUTION: In the hybrid optical disk (original optical disk 10) furnished with a ROM area (ROM part 11) exclusively used for reproduction and a RAM area (RAM part 12) where the write once is allowed, the information (1st DiscID) for identifying the original optical disk respectively is stamped to both of a 1st area (data part 11c) and a 2nd area (PMA part 11a) of the above ROM area. By this procedure, the DiscIDs stamped or recorded on the 1st area and 2nd area are compared, and the disk is judged as the original optical disk when they are the same DiscID, and can be judged as the already copied optical disk when they are not the same. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a hybrid optical disk and a drive for reproducing the same, and more particularly, to a hybrid optical disk and a drive for reproducing the hybrid optical disk which permit only additional writing to an original hybrid optical disk and do not allow additional writing to a hybrid optical disk other than the original.
[0002]
[Prior art]
A “CD-ROM” in which an OS (basic software), application programs, and data for a PC (personal computer) are stamped (recorded in a ROM format during mass production) is known. Since this CD-ROM is a read-only CD, there is a disadvantage that it is not possible to modify an application program or additionally record data. However, from a different point of view, the fact that the CD-ROM cannot be additionally recorded has an advantage that data or the like cannot be falsified or erased.
On the other hand, “CD-R / RW” is an optical disk on which data can be additionally written or rewritten, and thus has the advantage that application programs can be easily modified and data can be easily updated. On the other hand, data can be falsified or erased. It also has disadvantages.
[0003]
Also, a CD-R / RW in which data is recorded by a drive (driving device) (created by duplication) has advantages of a CD-ROM (cannot be altered or erased) and advantages of a CD-R / RW ( It is a recording medium that has both data correction and update. However, since it is necessary to record data with a drive, it is difficult to mass-produce the data quickly and inexpensively.
As a recording medium suitable for mass production at low cost, a "hybrid CD-R / RW" (hereinafter, referred to as a hybrid optical disk) including a ROM and a RAM having both advantages of a CD-ROM and a CD-R / RW. ) Has been proposed. In this hybrid optical disc, the first session is a read-only ROM area formed by pits having the same irregularities as the CD-ROM, and the second and subsequent sessions are a write-once and erasable RAM area.
[0004]
By the way, the CD-ROM uses Al (aluminum) as a reflective layer material. On the other hand, the hybrid optical disk has an entire disk surface for the purpose of additionally writing data and for making the reflectance the same in the ROM section and the RAM section (this enables reproduction by a commercially available CD recording / reproducing apparatus). Is formed of a dye material of write-once (a recording method in which writing can be performed only once but cannot be erased) or a rewritable phase-change recording material.
[0005]
[Problems to be solved by the invention]
However, the hybrid optical disk created by the duplication using the above-mentioned drive can copy or add contents such as data, and the original (original) hybrid optical disk and the hybrid optical disk for copying can be similarly copied / recorded. It becomes possible to postscript.
[0006]
This has the following disadvantages. For example, one original hybrid optical disc of the latest hit song is regularly purchased, and the hit song is copied to a hybrid optical disc for copying (blank disc). Then, the copied hybrid optical disk is copied to another hybrid optical disk for copying. In this case, the copied hybrid optical discs are successively copied to another hybrid optical disc for copying.
Here, under the copyright law, copying from the original is permitted only for private use. Therefore, it is in violation of the copyright law to copy one after another from a copied hybrid optical disc to a hybrid optical disc for copying.
In addition, even when the hybrid optical disk for copying consists only of a RAM area in which additional writing and erasing can be performed, there is the same disadvantage as described above.
[0007]
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a hybrid optical disk and a drive for reproducing the hybrid optical disk, which allow additional writing only to an original hybrid optical disk and do not allow additional writing to a non-original hybrid optical disk. And
[0008]
[Means for Solving the Problems]
According to an aspect of the present invention, there is provided a hybrid optical disk including a read-only ROM area and a write-once RAM area.
Information (first Disc ID) for identifying an original optical disc is provided in both the first area (data section 11c in FIG. 1A) and the second area (PMA section 11a) of the ROM area. Is stamped.
[0009]
By doing so, the original optical disc 10 becomes, for example, as shown in FIG. 1A, and the first Disc ID is stamped on both the data section 11c and the PMA section 11a.
On the other hand, the copied optical disc 20 stamped from the original optical disc 10 is as shown in FIG. 1B, the first Disc ID is recorded only in the data section 21c, and the “second Disc ID” is recorded in the PMA section 21a. Is recorded. The second DiscID is generated and recorded by the drive that has performed the copy at random, and is different from the second DiscID and the first DiscID.
[0010]
Therefore, the disc IDs stamped or recorded in the first area and the second area are compared, and if they are the same Disc ID (that is, the first Disc ID), it is determined that the disc is the original optical disc. (1st DiscID and 2nd DiscID).
If, for example, a drive for reproduction / recording is provided with this comparison judgment function, "additional recording / copying is possible in the case of an original optical disk", and "additional recording / copying is impossible in the case of a copied optical disk" can do. That is, additional writing / copying from the copied optical disk to the copy optical disk can be disabled.
[0011]
According to a second aspect, in the hybrid optical disk according to the first aspect,
The ROM area is stamped with a write enable / disable determination program for determining whether the hybrid optical disk to be copied is write-once or non-write-once.
According to this configuration, when the original optical disk is copied to the copy optical disk, the additional write enable / disable determination program is also copied at the same time. Therefore, it is possible to determine whether the additional write / copy is possible only with the copied optical disk.
[0012]
According to a third aspect, the drive for reproducing the hybrid optical disk according to the second aspect is
An additional-recording-possibility determining program reading means (an additional-recording-possibility determining program reading unit 31 in FIG. 2) for reading an additional-recording permission / non-permission judgment program for the hybrid optical disc loaded in the drive;
A hybrid optical disc identification information reading means (Disc ID reading unit 32) for reading the hybrid optical disc identification information;
Based on the read-write enable / disable determination program and the hybrid optical disk identification information read by the additional write enable / disable determination program reading means and the hybrid optical disk identification information reading means, it is determined whether additional writing is possible on the hybrid optical disk loaded in the drive. And a means for determining whether additional writing is possible (an additional writing determination unit 33).
[0013]
With this configuration, the drive alone reads the Disc ID and the additional write enable / disable determination program for the loaded original optical disk or copy optical disk, and determines whether the additional write is or is not possible for these optical disks. Can be determined.
[0014]
According to a fourth aspect, the drive for reproducing a hybrid optical disk (the CD-RW drive 30 in FIG. 2) according to the third aspect is connected to a personal computer (PC).
In this way, as shown in FIG. 2, for example, if the playback drive (CD-RW drive 30) is connected (for example, built-in) to a personal computer (PC), the optical disc loaded by the personal computer It is possible to determine whether additional writing / copying to the (original optical disk 10 or copied optical disk 20) is possible or not.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described based on the illustrated embodiments.
FIG. 1A is a schematic diagram of an original hybrid optical disk of the present embodiment, FIG. 1B is a schematic diagram of a case where an original disk is copied to a hybrid optical disk for copying (blank disk), and FIG. FIG. 3 is a flowchart of a determination as to whether or not additional writing is possible on an optical disk, and FIG. 4 is a diagram illustrating a process of forming a hybrid optical disk according to the present embodiment.
[0016]
As shown in FIG. 1A, a hybrid optical disc (hereinafter, referred to as an original optical disc) 10 according to the present embodiment includes a ROM section 11 on which read-only data is stamped, and a write-once RAM section 12.
The ROM section 11 has a PMA (program memory area) section 11a, a TOC (Table of Contents) section 11b, a data section 11c, and a read-out section 11d that records data indicating that reading of necessary data has been completed. To form
[0017]
The PMA unit 11a is stamped with “1st Disc ID” (original optical disc identification information), which is information for identifying each original optical disc, at the time of mass production, and the first disc ID and “append record” are added to the data unit 11c. Stamp the "possibility judgment program" at the time of mass production.
Here, the write-once / non-writable program is a program for determining whether the optical disk loaded in the CD-RW drive 30 (described later) is an original optical disk or a copy optical disk (blank disk).
[0018]
On the other hand, a copied hybrid optical disk (hereinafter, referred to as a copied optical disk) 20 copied from the original optical disk 10 to a hybrid optical disk for copying has a ROM 21 and a RAM 22 as shown in FIG. Is provided.
The ROM section 22 includes a PMA section 21a, a TOC section 21b, a data section 21c, and a lead-out section 21d. Then, the “second disc ID” described below is recorded in the PMA unit 21a by copying from the original optical disc 10 described above. Further, the data of the TOC section 11b of the original optical disc 10 is copied as it is to the TOC section 21b, the first Disc ID and the additional write enable / disable determination program are copied as it is to the data section 21c, and the original optical disc 10 is copied to the lead-out section 21d. The data of the lead-out section 11d is copied as it is.
[0019]
Here, the probability that the second DiscID matches the first DiscID recorded on the original optical disc 10 is close to zero because the drive that has executed the copy records a random value on the copy optical disc.
The PMA unit 21a, the TOC unit 21b, the data unit 21c, and the lead-out unit 21d can be additionally written only once by the write-at-once operation of the drive. This is shown as a ROM.
[0020]
Next, the personal computer (personal computer) PC shown in FIG. 2 will be described. The personal computer PC loads the above-mentioned original optical disk 10 and the copied optical disk 20 separately, and determines “whether or not additional writing to the optical disk is possible”.
As shown in FIG. 2, a personal computer PC is loaded with an original optical disk 10 or a copied optical disk 20, respectively, and a CD-RW drive 30 for performing reproduction, additional recording, and the like, and an optical disk for determining whether or not additional recording is possible on the loaded optical disk. It comprises a judgment control unit 40 and a display unit 50 for displaying whether or not additional writing is possible.
[0021]
The CD-RW drive 30 includes an additional recordability determination program reading unit 31, a DiscID read unit 32, and an additional recordability determination unit 33. The additional recording possibility determination program reading unit 31, the Disc ID reading unit 32, and the additional recording possibility determination unit 33 can be configured by a program.
The additional recording possibility determination program reading unit 31 reads the additional recording possibility determination program recorded or copied in the data part of the optical disk (original or copied). Here, "copy" refers to copying from the original optical disc, and "recording" refers to recording with a stamp during mass production of the original optical disc.
[0022]
The Disc ID reading unit 32 reads various Disc IDs of the loaded original optical disc 10 or copied optical disc 20. As shown in FIGS. 1A and 1B, in the case of the original optical disc 10, the disc ID includes the “first disc ID” recorded in the PMA section 11a and the “first disc ID” recorded in the data section 11c. 1 DiscID ”. In the case of the copied optical disc 20, there are a "second Disc ID" recorded in the PMA section 21a and a "first Disc ID" copied in the data section 21c.
[0023]
The additional-recording permission / non-permission determining unit 33 determines that additional recording is possible when “the first Disc ID is stamped on both the PMA unit 11a and the data unit 11c” by the read Disc ID and the additional-recording permission / non-permission determination program. Then, a signal (Disc Identification Validation bit, hereinafter referred to as DIVB = 1) capable of additional recording is generated, and DIVB = 1 is returned to the optical disc determination control unit 40.
On the other hand, in the case of the copied optical disc 20, the first DiscID is copied to the data section 21c, but the second DiscID is copied to the PMA section 21a. Therefore, “the first DiscID cannot be read from both the PMA unit 21a and the data unit 21c”. That is, as described above, the probability that the second DiscID generated by the drive at random and the first DiscID stamped in advance coincides is extremely low. In this case, it is determined that the additional recording is not possible by the additional recording permission / inhibition determination program, and a signal indicating that additional recording is not possible (DIVB = 0) is returned to the optical disk determination control unit 40.
[0024]
In addition, even in the case of an original optical disc, for example, in the case of an original optical disc stamped with “third DiscID (that is, a completely different DiscID)”, the discID read is different, so the additional recording permission / inhibition determination program requires additional recording. Judge as impossible. Then, a signal indicating that additional recording is not possible (DIVB = 0) is returned to the optical disc determination control unit 40.
Further, when nothing is recorded or copied on the PMA units 11a and 21a, a signal indicating that additional recording is not possible (DIVB = 0) is returned to the optical disc determination control unit 40.
[0025]
Next, the optical disc determination control unit 40 includes a determination request command transmission / reception unit 41 and a display control unit 42. The determination request command transmitting / receiving unit 41 and the display control unit 42 can be configured by a program.
The determination request command transmission / reception unit 41 transmits a “determination request command” for requesting a determination as to whether or not additional writing of the loaded optical disk is possible to the CD-RW drive 30 and receives a response from the CD-RW drive 30. The reception result is one of the above-mentioned “appendable (DIVB = 1)” and “appendable (DIVB = 0)”.
The display control unit 42 performs control to display “appendable” on the display unit 50 if the output of the determination command transmitting / receiving unit 41 is recordable, and performs control to display “appendable” if the record is not appendable. When the user sees the indication "append not possible", the user knows that further copying from the optical disk (actually, a copied optical disk) is impossible.
[0026]
Next, the operation of the present embodiment will be described based on the flowcharts shown in FIGS. 1, 2 and 3.
As shown in FIG. 3, the optical disc for which the additional recording is to be determined is loaded into the CD-RW drive 30 of the personal computer PC (step S1). A power switch (not shown) is turned on to operate the personal computer PC (step S2). The loaded optical disk rotates, and in this rotating state, the additional recording permission / non-permission determination program reading section 33 of the CD-RW drive 30 reads the additional recording permission / non-permission determination program (Step S3), and the DiscID reader 32 reads the Disc ID (Step S4). ).
[0027]
If the disc IDs of the read PMA section and the data section match, the loaded optical disc is the original optical disc 10 as described above, so it is determined that additional recording is possible (step S5: coincidence), and additional recording on the original optical disc 10 is performed. Is executed (step S6). This additional data is prepared separately.
Conversely, if the optical disc is the copied optical disc 20, the disc IDs of the PMA section and the data section do not match, so it is determined that additional recording is not possible (step S5: does not match), and the display section 50 displays "append impossible". It is displayed (step S7). In addition, even if the DiscID is not stamped, the display unit 50 displays “cannot be added”.
[0028]
In this way, it is possible to perform additional recording only on the original optical disc in which the Disc IDs of the PMA section and the data section match. Further, when the respective Disc IDs do not match (added optical disc), additional recording on the optical disc with completely different Disc ID even if it is the original can be made impossible.
[0029]
Next, a method for creating an original optical disk used in the present embodiment will be described.
FIG. 4 is a diagram illustrating a process of forming an original optical disc used in the present embodiment. In the present embodiment, a stamper for producing an optical disc can be manufactured by a method similar to that of Japanese Patent No. 3041388 (a method for manufacturing an optical information recording medium and a master for an optical information recording medium stamper).
[0030]
As shown in FIG. 4, a first photoresist is applied to a glass plate by spin coating (Step S11), and an intermediate layer is provided on the first photoresist (Step S12). The intermediate layer can be made of a transparent material using an argon laser beam wavelength to form pits and grooves, and a transparent oxide film of ZnO, ITO, or the like is formed by sputtering.
Next, after a second photoresist is formed on the intermediate layer by spin coating (step S13), laser cutting is performed. By laser cutting, PMA (Program Memory Area), TOC (Table Of Contents), data part, uneven pits of lead-out of ROM part, groove (groove) called ATIP (Absolute Time In Plegroove) and address of ROM and RAM part. Form information. Disc ID is formed in the PMA and the data section as identification information for identifying each optical disk (see FIG. 1A).
[0031]
In order to form pits in the ROM section and grooves in the ROM and RAM sections, two-beam exposure is performed, and the pit section is exposed with high power and the groove section is exposed with low power (step S14). In order to form ATIP address information with the groove, the address information is formed by wobbling a laser beam.
[0032]
After the exposure is completed, the first development is performed (Step S15), the exposed portion of the second photoresist is removed, and the intermediate layer is removed by etching (Step S16), and the second development is performed to have two depths of a pit and a groove. The original is completed (step S17). Thereafter, a conductive metal is deposited by Ni sputtering and electroforming (step S18), and the conductive metal is peeled off from the master to complete a stamper necessary for forming the ROM and RAM sections (step S19). Using this stamper, a large number of optical disk substrates are copied by an injection molding method, a 2P method, or the like (step S20).
[0033]
In the case of a phase change recording medium rewritable on the optical disk substrate by a sputtering method, a dielectric layer (such as ZnSSiO2) / a recording layer (such as AgInSbTe, AgInSbGeTe, GeSbTe) / a dielectric layer (such as ZnSSiO2) / a reflective layer (AlTi, AlTa). Is formed (step S21).
In the case of a non-rewritable write-once optical disk, a solution in which a dye material such as cyanine or phthalocyanine is dissolved in a solvent is applied by a spin coater, and a reflective film such as Au or Ag is formed by a sputtering method. Thereafter, an ultraviolet curable resin is formed on the recording film by spin coating, and is cured by irradiating UV light.
The hybrid optical disk (original optical disk 10) is completed by this process (step S22). In the case of a phase-change hybrid optical disk, an initialization device irradiates an LD beam having a larger diameter than the substrate surface to crystallize the recording layer, thereby completing a hybrid optical disk.
[0034]
【The invention's effect】
As described above, according to the present invention, the following effects can be exerted.
According to the first aspect of the present invention, since information (Disc ID) for identifying an original optical disk is stamped in both the first area and the second area of the ROM area, the first area is stamped. The disc IDs stamped or recorded in the area and the second area are compared. If the disc IDs are the same, the disc is determined to be the original optical disc. If not, the disc is determined to be the copied optical disc.
[0035]
According to the second aspect of the present invention, since the hybrid optical disc to be copied is stamped in the ROM area with a recordable / non-recordable determination program for determining whether the recordable or unrecordable data can be recorded on the copy optical disc. When a copy is made from the original optical disc, the program for judging whether additional recording is possible is also copied at the same time, so that it is possible to judge whether additional recording / copying is possible only with the copied optical disc.
According to the third aspect of the present invention, since the reproducing drive is provided with the additional recording permission / inhibition judgment program reading means, the hybrid optical disk identification information reading means, and the additional recording permission / inhibition judgment means, the original optical disk loaded alone by the drive is used. Alternatively, it is possible to read the Disc ID and the additional write enable / disable determination program for the optical disc for copying, and determine whether the additional write is possible or not for the optical disc.
[0036]
According to the fourth aspect of the present invention, since the drive for reproducing the hybrid optical disk according to the third aspect is connected to a personal computer, for example, as shown in FIG. It is possible to determine whether additional writing / copying to the original optical disk or copied optical disk) is possible or not.
[Brief description of the drawings]
FIG. 1 is a schematic diagram of a hybrid optical disc used in the description of an embodiment of the present invention, wherein (A) is an original hybrid optical disc and (B) is a copied hybrid optical disc.
FIG. 2 is a block diagram of an apparatus to which the hybrid optical disc according to the embodiment is applied.
FIG. 3 is a flowchart of the embodiment.
FIG. 4 is a diagram showing a process of forming an original hybrid optical disc used in the embodiment.
[Explanation of symbols]
PC personal computer 10 original optical disk 11 ROM section 11a PMA section 11b OC section 11c data section 11d lead-out section 12 RAM section 20 copied optical disk 21 ROM section 21a PMA section 21b TOC section 21c ... Data part 21d ... Lead-out part 22 ... RAM part 30 ... CD-RW drive 31 ... Recordable / non-recordable judgment program reading part 32 ... DiscID reading part 33 ... Recordable / non-recordable judgment part 40 ... Optical disk judgment control part 41 ... Decision request command transmitting / receiving part 42 display control unit 50 display unit

Claims (4)

In a hybrid optical disc including a read-only ROM area and a write-once RAM area,
A hybrid optical disc, wherein information for identifying an original optical disc is stamped in both the first area and the second area of the ROM area. The hybrid optical disc according to claim 1,
A hybrid optical disc characterized by stamping, in the ROM area, a recordable / non-writable program for judging whether the hybrid optical disc to be copied is recordable or not. A drive for reproducing the hybrid optical disk according to claim 2,
An additional-write-possibility determination program reading means for reading a write-enable / disable determination program for the hybrid optical disc loaded in the drive;
Hybrid optical disc identification information reading means for reading the hybrid optical disc identification information;
Based on the read-write enable / disable determination program and the hybrid optical disk identification information read by the additional write enable / disable determination program reading means and the hybrid optical disk identification information reading means, it is determined whether additional writing is possible on the hybrid optical disk loaded in the drive. A drive for reproducing a hybrid optical disk, comprising: a write-once / non-write enable / disable determination unit for determining whether the read / write operation is performed. A hybrid optical disc reproducing apparatus, wherein the hybrid optical disc reproducing drive according to claim 3 is connected to a personal computer.

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