Blu-ray Disc format is required by the forthcoming of High Definition TV era, which calls for a new generation ofoptical storage after DVD. The storage demanding MPEG2 format HDTV normally has a data rate between 20 and 30
Mbps. For example, a 135 minutes recording of 25Mbps HDTV program requires a storage capacity about 24GB. Bluray
Disc is specifically defined for such a capacity. To have the capacity five times that of DVD, BD employs the
wavelength short as 405nm and numerical aperture high as 0.85. It is regarded the blue-violet wavelength will be the
shortest wavelength in optical disc and 0.85 will also be the highest numerical aperture used for far-field optical storage.
To ensure a quick learning curve not only for the drive manufacturing but also for the disc production, Blu-ray Disc is
designed to have even wider disc tolerances than those of DVD. Thanks for those more innovative concepts Blu-ray Disc
is the most economical storage solution in terms of cost per giga byte. We can expect an even better result at a mass
production level.
To introduce a new generation of optical storage, a long term standard is much more preferred rather than an interim
solution. It is just like what happened in the history when the DVD format was defined. At that time, an interim solution
of less capacity was proposed. Finally this solution was not introduced to the market.
No comments:
Post a Comment