Large Capacity Optical Disc Video Recording Format ""Blu-ray Disc"" Established

The Blu-ray Disc, Using Blue-Violet Laser, Achieves Over Two-Hour Digital High-Definition Video Recording On A 12 cm Diameter CD/DVD Size Phase Change Optical Disc

20-Feb-02

Nine leading companies announced that they have jointly established the basic specifications for a next-generation, large capacity optical disc video recording format, called ""Blu-ray Disc"". The Blu-ray Disc enables the recording, rewriting, and playback of up to 27 gigabytes (GB) of data on a single-sided, single-layer 12 cm CD/DVD size disc using a 405 nm blue-violet laser. The companies that established the basic specifications for the Blu-ray Disc are: Hitachi Ltd., LG Electronics Inc., Matsushita Electric Industrial Co., Ltd., Pioneer Corporation, Royal Philips Electronics, Samsung Electronics Co. Ltd., Sharp Corporation, Sony Corporation, and Thomson Multimedia.  In addition to actively promoting the new format throughout the Industry, the nine companies listed above plan to begin licensing the new format as soon as specifications are completed. Licensing is expected to start around the spring of 2002. By employing a short wavelength blue violet laser, the Blu-ray Disc successfully minimizes its beam spot size by making the numerical aperture (NA) 0.85, on a field lens that converges the laser. In addition, by using a disc structure with a 0.1 mm optical transmittance protection layer, the Blu-ray Disc diminishes aberration caused by disc tilt. This also allows for disc better readout and an increased recording density. The Blu-ray Disc's tracking pitch is reduced to 0.32 um, almost half of that of a regular DVD, achieving up to 27 GB high density recording on a single sided disc.  Because the Blu-ray Disc utilizes global standard ""MPEG-2 Transport Stream"" compression technology, highly compatible with digital broadcasting for video recording, a wide range of content can be recorded. It is possible for the Blu-ray Disc to record digital high-definition broadcasting, while maintaining high quality and other data simultaneously with video data, if they are received together. In addition, the adoption of a unique ID written on a Blu-ray Disc realizes high quality copyright protection functions. The Blu-ray Disc is a technology platform that can store sound and video, while maintaining high quality and also access the stored content in an easy-to-use way. This will be important in the coming broadband era as content distribution becomes increasingly diversified. The nine companies involved in the announcement will respectively develop products that take full advantage of Blu-ray Disc's large capacity and high speed data transfer rate. They are also aiming to further enhance the appeal of the new format through developing a larger capacity, such as over 30 GB on a single-sided, single-layer disc and over 50 GB on a single-sided, double-layer disc. Adoption of the Blu-ray Disc in a variety of applications including PC data storage and high-definition video software is being considered. ""Blu-ray Disc"" Key Characteristics - Large recording capacity up to 27GB: by adopting a 405 nm blue-violet semiconductor laser, with a 0.85 NA field lens and a 0.1 mm optical transmittance protection disc layer structure, it can record up to 27 GB video data on a single-sided 12 cm phase change disc. It can record over two hours of digital high definition video and more than 13 hours of standard TV broadcasting (VHS/standard-definition picture quality, 3.8 Mbps).- High speed data transfer rate of 36 Mbps: it is possible for the Blu-ray Disc to record digital high-definition broadcasts or high-definition images from a digital video camera, while maintaining the original picture quality. In addition, by fully utilizing an optical disc's random accessing functions, it is possible to easily edit video data captured on a video camera or play back prerecorded video on the disc while simultaneously recording images being broadcast on TV.- Easy-to-use disc cartridge: an easy-to-use optical disc cartridge protects the optical disc's recording and playback phase from dust and fingerprints.