02-02-2010, 02:23 PM
BLURAY-DISC new.ppt (Size: 538.5 KB / Downloads: 467)
Foundation
Blu-ray disc (BD) is appropriately named after the blue laser
used to write the data
The first blue laser was developed in 1996 by Shuji Nakamura
(Nichia Corporation)
In 2002, an alliance was formed, called the Blu-ray Disc
Association, including the likes of Sony, Samsung, Sharp,
Hewlett-Packard, and Royal Phillips
The e is intentionally left out of the name due to trademark
restrictions
Evolution
VHS: analog
DVD: digital
BD: high-definition
Enables recording, rewriting, and playback of high-definition
video
Capable of storing information that the DVD and CD are not
capable of holding
Disc Characteristics
Single layer: 25 GB
Dual layer: 50 GB
Diameter: 120 mm
Thickness: 1.2 mm
Center hole diameter: 15 mm
Uses GaN laser of wavelength 400 nm
The smaller laser, compared to the DVD and CD, keeps the process
more efficient (~5 mW)