On February 19, 2002, Japan, Sony, Hitachi, Panasonic, Sharp, Samsung, LG, U.S. Pioneer, Philips, Thomson Multime dia and other nine international mainstream electronics giant (New 9C) joint announced that it will use the blue laser as the light source to develop a new generation of optical disc standard, and from the spring of 2002 to provide a standard license. Next-generation optical disc called Blue-ray Disc

While Toshiba and NEC are to propose an alternative to the DVD Forum, Blue-ray Disc - HD-DVD specification, it is more easily compatible with the existing DVD.

  In November 2002, Taiwan's ITRI's Opto-Electronics also issued a third set of Blue-ray Disc, which has two separately with Blue-ray Disc and HD-DVD a similar program.

Opto-Electronics & proposals, and actively seek support from the industry the mainland, with a view to alleviate cross-strait CD-ROM industry in the pressure on the issue of royalties

The above-mentioned three Blue-ray discs are 120mm diameter discs. In addition, Plasmon presents a year called UDO (Ultra Density Optical) Blue-ray Disc. This is a 5.25 "double-sided record with a casing of the CD-ROM, with a capacity of 30GB-120GB.

The emergence of Blue-ray disc of the human indicates the progress in the optical storage technology. 4.7G DVD-discs can store 133 minutes by the MPEG2-encoded video information. With the emergence of high-definition video, DVD volume is too small. For example, 1 hour of high-definition digital TV programs require the storage capacity of about 12GB, to make a full save 2 hours HDTV programs, CD-ROMs need to 24GB capacity. It is expected that a new higher-capacity CD-ROM appear. In order to improve the capacity of CD-ROM in the DVD disc, based on the information to further reduce the size of pits and shorten the distance between pit in order to improve recording density, while, in order to reduce the spot size, using a shorter wavelength laser light source, increasing the value of lens aperture, to ensure the laser head in high-density optical disc can accurately read and write data. CD, VCD using a wavelength of 780nm infrared laser, DVD uses a wavelength of 635nm ~ 650nm red laser. While the new disc using a laser wavelength of 405nm, which is a Blue-Violet Laser, deserves the name Blue-ray Disc.





Blue-ray Disc



Blue-ray Disc, referred as BD, its specifications as shown above. BD disc features are: It consists of a thickness of 1.1mm of the recording layer and a thickness of only 0.1mm composite made of a transparent protective layer. The work of the shorter wavelength light source, in the recording layer surface can be comparable with the operating wavelength of fingerprints; dust will read and write CDs a serious impact on the quality. Starting from the DVD disc, it is used in the substrate as a protective layer. Protective layer can protect the recording layer from being scratched, but also easy to wipe the surface. BD's NA than 1.42 times the big DVD, resulting in the optical axis and the optical disc recording surface tilt angle allows to narrow the scope of 2.9 times. Laser wavelength shorter, but also to narrow the angle of inclination is about 1.6 times the permissible range. Tilt angle is inversely proportional to the thickness of the permissible range and CD-ROM, in order to obtain a more lenient to allow the scope, only the protective layer to reduce the thickness of 0.1mm thickness of selected programs.

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