This  Electronics Engineering Seminar Topic deals with the following:

Tokyo Japan, February 19, 2002: Nine leading companies today 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 play back of up to 27 gigabytes (GB) of data on a single sided single layer 12cm CD/DVD size disc using a 405nm blue-violet laser.

By employing a short wavelength blue violet laser, the Blu-ray Disc successfully minimizes its beam spot size by making the numerical aperture (NA) on a field lens that converges the laser 0.85. In addition, by using a disc structure with a 0.1mm 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 0.32um, 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 30GB on a single sided single layer disc and over 50GB 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.

Concept of the format establishment :

• To realize the large capacity with 12cm disc – More than 2-hour high definition video recording – High capacity of more than 4-hour recording by double layer technology.
•  To cope with digital broadcasting – High compatibility with digital broadcasting – To prevent illegitimate duplication of contents
• To enhance the Blu-ray Disc world – Adoption of the Blu-ray Disc in variety of media and applications

Main Features of physical format:

• Large recording capacity up to 27GB: By adopting a 405nm blue-violet semiconductor laser, with a 0.85NA field lens and a 0.1mm optical transmittance protection disc layer structure, it can record up to 27GB video data on a single sided 12cm phase change disc. It can record over 2 hours of digital high definition video and more than 13 hours of standard TV broadcasting (VHS/standard definition picture quality, 3.8Mbps)
• 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
• High-speed data transfer rate 36Mbps: 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 pre-recorded video on the disc while simultaneously recording images being broadcast on TV.
• Recording format:
• Like the DVD, the Blu-ray disc uses phase change recording. This must be good news for those who plan to make the new format compatible with its wildly popular predecessor. This recording format will also makes a two-sided disc easily realizable because both writing and reading can be executed by a single pickup.
• Multiplexing:
• Blu-ray disc utilizes global standards like MPEG-2 Transport Stream compression technology for video and audio multiplexing. This makes it possible for a Blu-ray Disc to record high definition broadcasting and other data simultaneously with video data if they are received together.

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