blue ray disc(1)

8/3/2019 Blue Ray Disc(1)

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Why the name Blu-ray?

The name Blu-ray is derived from the underlyingtechnology, which utilizes a blue-violet laser to readand write data.

The name is a combination of "Blue" (blue-violetlaser) and "Ray" (optical ray).

According to the Blu-ray Disc Association the

spelling of "Blu-ray" is not a mistake; the character"e" was intentionally left out so the term could beregistered as a trademark.


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History of Blu-Ray Disc

The Blu-ray standard was jointly developed by agroup of consumer electronics and PC companiescalled the Blu-ray Disc Association (BDA),spearheaded by Sony.

It is currently competing with the HD DVD formatfor wide adoption as the preferred next generationoptical standard, similar to the videotape format

war between JVC's VHS and Sony's Betamax. As of 2006, neither format has succeeded insupplanting the present home video standard, theDVD.


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What Blu-ray formats are planned?

As with conventional CDs and DVDs, Blu-ray plans to provide awide range of formats including ROM/R/RW. The followingformats are part of the Blu-ray Disc specification:

BD-ROM - read-only format for distribution of HD movies, games,software, etc.

BD-R - recordable format for HD video recording and PC datastorage.

BD-RE - rewritable format for HD video recording and PC datastorage. There's also plans for a BD/DVD hybrid format, which combines

Blu-ray and DVD on the same disc so that it can be played in bothBlu-ray players and DVD players.


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How much data can you fit on a Blu-ray disc?

A single-layer disc can hold 25GB.

A dual-layer disc can hold 50GB.

To ensure that the Blu-ray Disc format is easily extendable(future-proof) it also includes support for multi-layer discs,

which should allow the storage capacity to be increased to100GB-200GB (25GB per layer) in the future simply by addingmore layers to the discs.


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How fast can you read/write data on a Blu-ray disc?

According to the Blu-ray Disc specification, 1x speed is defined

as 36Mbps. However, as BD-ROM movies will require a 54Mbps data transfer

rate the minimum speed we're expecting to see is 2x (72Mbps). If we assume a maximum disc rotation speed of 10,000 RPM,

then 12x at the outer diameter should be possible (about400Mbps). T

his is why the Blu-ray Disc Association (BDA) already has plansto raise the speed to 8x (288Mbps) or more in the future.


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When will I be able to buy Blu-ray products?

If you live in the US, you will most likely have to wait until June25, 2006 when Samsung will introduce their Blu-ray player(was recently pushed back from May 23, 2006).

Pioneer and Sony plan to introduce their respective Blu-rayplayers in July.

While we've heard very little about the launch plans for the

European market, we expect it to follow shortly after the US(some products might launch earlier).


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What will Blu-ray products cost?

As with any new technology the first generation of products willlikely be quite expensive due to low production volumes.

Once mass production of components for Blu-ray products begins

the prices are expected to fall quickly.

According to the Blu-ray Disc Association, the overall cost ofmanufacturing Blu-ray Disc media will in the end be no more

expensive than producing a DVD.


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What about Blu-ray for PCs?

There are plans for BD-ROM (read-only), BD-R (recordable)and BD-RE (rewritable) drives for PCs, and with the support ofthe worlds two largest PC manufacturers, HP and Dell.

It's very likely that the technology will be adopted as the next-generation optical disc format for PC data storage and replace

technologies such as DVDR, DVDRW, and DVD-RAM.


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Parameters Blu-ray DVD

Storage capacity 25GB (single-layer)50GB (dual-layer)

4.7GB (single-layer)8.5GB (dual-layer)

Laser wavelength 405nm (blue laser) 650nm (red laser)

Numerical aperture (NA) 0.85 0.60

Disc diameterDisc thickness

120mm1.2mm

120mm1.2mm

Protection layerHard coating

0.1mmYes

0.6mmNo

Track pitch 0.32m 0.74m

Data transfer rate (data)Data transfer rate (video/audio)

36.0Mbps (1x)54.0Mbps (1.5x)

11.08Mbps (1x)10.08Mbps (


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Parameters Blu-ray HD-DVD

Storage capacity 25GB (single-layer)50GB (dual-layer)

15GB (single-layer)30GB (dual-layer)

Laser wavelength 405nm (blue laser) 405nm (blue laser)

Protection layerHard coating

0.1mmYes

0.6mmNo

Track pitch 0.32m 0.40m

Data transfer rate (data)Data transfer rate

36.0Mbps (1x)54.0Mbps (1.5x)

36.55Mbps (1x)36.55Mbps (1x)

Video resolution (max) 19201080(1080p)

19201080 (1080p)28.0Mbps

Video codecs MPEG-2MPEG-4 AVCSMPTE VC-1

MPEG-2MPEG-4 AVCSMPTE VC-1

Audio codecs Linear PCMDolby Digital

Dolby Digital Plus

Linear PCMDolby Digital

Dolby Digital PlusDolby TrueHD


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Blu-ray Advantages

Record high-definition television (HDTV) withoutany quality loss.

Instantly skip to any spot on the disc. Record one program while watching another on the

disc. Create playlists. Edit or reorder programs recorded on the disc. Automatically search for an empty space on the

disc to avoid recording over a program. Access the Web to download subtitles and other

extra features.


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Construction of Blu-Ray Disc

Traditional DVDs are built by injection molding

the two 0.6-mm discs between which therecording layer is sandwiched. The process must be done very carefully to

prevent birefringence. 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-moldingprocess on a single 1.1-mm disc, which reducescost.

That savings balances out the cost of adding theprotective layer, so the end price is no more thanthe price of a regular DVD.


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Blu-ray vs. Other New Disc Formats

Will Blu-ray replace previous DVDs?

Its manufacturers hope so.

In the meantime, JVC has developed a Blu-ray/DVD combodisc with an approximate 33.5-GB capacity, allowing for therelease of video in both formats on a single disc.

But Blu-ray is not alone in the marketplace. A few otherformats are competing for a share of the DVD market.


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Parts of a Blu-Ray Disc A completeBlu-Ray Disc


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Working of a Blu-Ray Disc


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Cross Section of a Blu-Ray Disc


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Supporting Companies


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Reference Sites:

www.sony.com

www.wikipedia.com

www.blu-raydisc.com

www.howstuffworks.com

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