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BLU-RAY DISC ASSOCIATION
LASER & OPTICS
WHY BLUE LASER
BLUE-RAY VS DVD QUALITY
Blu-ray, also known as Blu-ray Disc (BD) is the name of a next-generation optical disc format. The format was developed to enable recording, rewriting and playback of high-definition video (HD), as well as storing large amounts of data.
The format offers more than five times the storage capacity of traditional DVDs and can hold up to 25GB on a single-layer disc and 50GB on a dual-layer disc.
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
Blu-ray Disc Association
Apple Computer, Inc.
Hewlett Packard Company
LG Electronics Inc.
Matsushita Electric Industrial Co., Ltd.
Mitsubishi Electric Corporation
Royal Philips Electronics
Samsung Electronics Co., Ltd.
Twentieth Century Fox
Walt Disney Pictures
Warner Bros. Entertainment
Laser and optics
Blu-ray systems use a blue-violet laser operating at a wavelength of 405 nm, similar to the one used for HD DVD, to read and write data. Conventional DVDs and CDs use red and infrared lasers at 650 nm and 780 nm respectively.
Variations and Sizes
A single-layer Blu-ray disc (BD) has enough storage capacity (25GB) for approximately two hours of high-definition video with audio.
A dual-layer (50GB) BD can hold enough data for approximately four hours of HD video.
TDK recently announced that they have created a working Blu-ray disc capable of holding 200GB of data (six 33GB data layers).
Why Blue Lasers?
High-definition TV provides six times more picture information than standard-definition TV
More bits per second required
More gigabytes per disc required
Single layer: 25 GBDual layer: 50 GB
Diameter: 120 mm
Thickness: 1.2 mm
Center hole diameter: 15 mm
Uses GaN laser of wavelength 405 nm
The smaller laser, compared to the DVD and CD, keeps the process more efficient (~5 mW)
In January 2004 was introduced a clear polymer coating that gives Blu-ray Discs unprecedented scratch resistance. The coating was developed by TDK Corporation and is called "Durabis". It allows BDs to be cleaned safely with only a tissue.
CD vs DVD vs Blu-ray writing
This issue has introduced a competitor, the HD-DVD, that based its technology around being compatible with the DVD
Recently the BDA has developed recorders that are BD/DVD/CD compatible
JVC has advanced the BD by developing a BD/DVD combo disc that stores both DVD and BD data. It is composed of two DVD layers and a third BD layer storing 33.5 GB total
Record high-definition television (HDTV) without any quality loss
Instantly skip to any spot on the disc
Record one program while watching another on the disc
Edit or reorder programs recorded on the disc
Automatically search for an empty space on the disc
Expect the BD to become more prevalent once the HDTV market establishes its presence
Audio and video will reach higher qualities with larger storage space
Look for BD with more than two layers as the technology is further refined
Both DVD and BD would most likely co-exist for quiet some time until HDTVs become more widespread.
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