Patent Issued for Manufacturing Method for Optical Disc, Optical Disc, Playback Method for Optical Disc, Playback Apparatus for Optical Disc, Recording Apparatus for Optical Disc
The assignee for this patent, patent number 8750084, is
Reporters obtained the following quote from the background information supplied by the inventors: "Optical discs (including magneto optical discs) such as the Compact Disc (CD), the Mini-Disc (MD), the Digital Versatile Disc (DVD), the BLU-RAY Disc (registered trademark), and the like, for example, are known as recording media that record and play back digital data.
"'Optical disc' is a generic name for a recording medium in the shape of a circular disc in which a thin metal plate is covered by plastic and from which a signal can be read by shining a laser beam onto the disc and reading the changes in the reflected beam."
In addition to obtaining background information on this patent, VerticalNews editors also obtained the inventor's summary information for this patent: "In recent years, remarkable increases in capacity have been achieved by high-density recordings such as those seen on a Blu-ray Disc.
"Among the current Blu-ray Discs, those with one recording layer and two recording layers are known, having recording capacities of approximately 25 gigabytes (GB) and 50 GB, and they are used for recording video content and application programs.
"The use of high-density recording, multi-layer structures, and the like are being studied as ways to further increase the capacity of the Blu-ray Disc format.
"However, various types of equipment specifications have established that are compatible with the current version of the Blu-ray Disc (hereinafter called the Ver. 1.0 disc), and there is concern that a new version will create problems with disc drive devices that are already commercially available (hereinafter called the Ver. 1.0 drives).
"For example, if a new version of the Blu-ray Disc that incorporates a multi-layer structure of at least three layers (hereinafter called the Ver. 2.0 disc) becomes commercially available in the future, it could happen that a user would load a Ver. 2.0 disc into a Ver. 1.0 drive.
"Basically, because the Blu-ray Disc format is the same, recording and playing back a Ver. 2.0 disc on a Ver. 1.0 drive would not be absolutely impossible. However, if the Ver. 2.0 disc is achieved by using higher density and more layers, it can be assumed that the various types of specifications with which the Ver. 1.0 drive is provided would not he adequate.
"Therefore, in a case where recording and playback of a Ver. 2.0 disc are done on a Ver. 1.0 drive, there is concern that recording errors and playback errors would occur with greater frequency.
"The present invention is made in view of the above-mentioned issue and makes recording and playback impossible of a Ver. 2.0 disc is loaded into a Ver. 1.0 drive. In other words, rather than being able to record and play back in an unacceptable way, the present invention renders the Ver. 2.0 disc incompatible with the Ver. 1.0 drive. Conversely, this increases the usability of the Blu-ray Disc system for the user.
"According to the present invention as described above, the error correction encoded address information is recorded on the second version recording medium after being transformed such that the address decoding cannot be performed by a playback device that is not compatible with the second version of the recording medium. Therefore, the address decoding for the second version recording medium cannot be performed by the incompatible playback device (for example, a playback device that was manufactured to be compatible only with the first version of the recording medium).
"In other words, the same error correction encoding processing is used for both the first version and the second version, but because the error correction encoded address information is transformed by the inverting of specific bits or the like, a state is created in which address errors cannot be corrected, so the address decoding becomes impossible. Because the address decoding cannot be done, even if the second version recording medium is loaded into the incompatible playback device, it can be put into a state in which it cannot be accessed (recording and playback are impossible).
"According to the present invention, with the recording medium according to the present invention (the second version recording medium), it is possible to create a state in which the address decoding cannot be done, thus making recording and playback impossible, in the known recording device and the known playback device that are compatible only with the first version of the recording medium, which uses the same data format and the same error correction processing as the second version. Thus, even though the second version recording medium according to the present invention is the same type of recording medium as the first version, it is possible to make only the second version recording medium unusable in the known recording device and the known playback device, making it possible to avoid the occurrence of an unstable operating state. The usability of the entire system is therefore improved."
For more information, see this patent:
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