How Blu-ray Discs Work by Dušan Ristić

Introduction to How Blu-ray Discs Work Introduction to How Blu-ray Discs Work Building a Blu-ray Disc How Blu-ray Reads Data Blu-ray Competitors

Introduction to How Blu-ray Discs Work  Şingle-layer Blu-ray disc- 27 GB data;2h HDTV; 13h st.  A double-layer Blu-ray disc- 50 GB;4.5h HDTV;20h st.  "blue,“- for the color of the laser ; “ray,“-for optical ray. The "e" in "blue“- left of because an everyday word cannot be trademarked. nazad slika početna

Building a Blu-ray Disc  Laser “writes”-pits; laser reads-the bumps  A blue laser has a shorter wavelength (405 nanometers);  pits are only 0.15 µm; track pitch from 0.74 µm to 0.32 µm  BD thickness (1.2 millimeters) as a DVD;  Birefringence-data between two polycarbonate layers(o.6 mm) disc tilt- the disc can not be read nazad slika početna

How Blu-ray Reads Data  data on top of a 1.1-mm-thick polycarbonate layer - no birefringence  recording layer sitting closer to the objective lens of the reading mechanism –no disc tilt  Because the data is closer to the surface, a hard coating is placed on the outside of the disc to protect it from scratches and fingerprints.  data transfer rate: BD - 36 Mbps ; DVD - 10 Mbps Nazad slika početna

Cost  DVDs – by injection molding the two 0.6-mm discs recording layer between them; must be done very carefully to prevent birefringence.  BD: -The two discs are molded. -The recording layer is added to one of the discs. -The two discs are glued together.  Blu-ray discs only do the injection-molding process on a single 1.1- mm disc; that savings balances out the cost of adding the protective layer; the end price of BD is no more than the price of a regular DVD.  Blu-ray discs are better armed than current DVDs. They come equipped with a secure encryption system -- a unique ID that protects against video piracy and copyright infringement. početna Nazad

Formats  DVDs and CDs started with read-only formats and only later added recordable and re-writable formats, Blu-ray is initially designed in several different formats: -BD-ROM (read-only) - for pre-recorded content -BD-R (recordable) - for PC data storage -BD-RW (rewritable) - for PC data storage -BD-RE (rewritable) - for HDTV recording početna Nazad

Blu-ray Competitors  JVC - Blu-ray/DVD combo disc GB  HD-DVD or AOD (Advanced Optical Disc), Toshiba and NEC; single-layer HD- DVD-RW -15 GB; a double-layer -30 GB; a triple-layer -45 GB  Warner Bros. Pictures -HD-DVD-9 ; uses a higher compression rate to put more information on a standard DVD.  Taiwan -Forward Versatile Disc (FVD)- 5.4 GB- single-sided disc and 9.8 GB - double-sided disc  China - Enhanced Video Disc (EVD)  Sony -XDCAM and ProData (Professional Disc for Data).  Pioneer is developing an optical disc that will blow away the hard disc in most of our PCs; holding GB; Pioneer's lasers are ultraviolet, which have an even shorter wavelength than the blue. nazad početna slika

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Samsung BD P100