Blu Ray Discs1

8/8/2019 Blu Ray Discs1

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Blu-rayis the next-generation digital

video disc. It can record, store andplay back high-definition video anddigital audio, as well as computer

data. The advantage to Blu-ray is thesheer amount of information it canhold.

INTRODUCTION

BLU RAY DISC


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In the 90s Shuji Nakamura invented practical blue laserdiodes.

Sony then started two projects :UDO and DVR Blue, a formatof rewritable discs which eventually became Blu-ray.

The first consumer devices were in stores on April 10,2003.A Sony BDZ-S77 a BD-RE recorder that was only madeavailable in Japan.

Blu-ray physical specifications were finished in 2004.

The first Blu-ray Disc titles were released on June 20, 2006.

BLU RAY DISC

HISTORY


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Blu-Ray disc is of same size as DVD .

Its thickness is 1.2 mm .

It is made up of polycarbonate.

It is read by blue laser (450 nm).

It requires a special player.

BLU RAY DISC

TECHNICAL FEATURES


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A single-layer Blu-ray disc, can hold up to 27GB of data -- that's more than two hours ofhigh-definition video or about 13 hours ofstandard video.

A double-layer Blu-ray disc can store up to50 GB, enough to hold about 4.5 hours ofhigh-definition video or more than 20

hours of standard video.

TECHNICAL FEATURES(contd.)

BLU RAY DISC


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Discs store data in pits. A laser reads the otherside of these pits -- the bumps to read the

data on the DVD.

To store more data smaller pits are requiredand to read smaller bumps smaller laser is

required.

Presently, DVDs use infrared(600 700 nm),Blu-ray uses a bluelaser(450nm).

CONSTRUCTION AND DESIGN

BLU RAY DISC


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The minimum "spot size" on which a laser can

be focused depends on

Diffraction

Wavelength

Numerical aperture

CONSTRUCTION AND DESIGN


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By decreasing the wavelength, using a highernumerical aperture (0.85, compared with 0.6for DVD), higher quality, dual-lens system, andmaking the cover layer thinner to avoid

unwanted optical effects the laser beam can befocused much more tightly. So it allows data tobe stored in a much smaller area therebyincreasing blu-raysize to 5 times than normal

dvd.It also consists of a scratch protective layer.


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Blu-ray is designed in several differentformats:

BD-ROM (read-only) - for pre-recordedcontent

BD-R (recordable) - for PC data storage

BD-RW (rewritable) - for PC data storage

BD-RE (rewritable) - for HDTV recording

BLU RAY DISC

BLU RAY DISC FORMATS


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Storage area is enormous rangingfrom 25 to 50 GB of space

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 create playlists

BLU RAY DISC

BLU RAY DISC


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In its initial days only BD has enoughcompetitors to handle.

o Hitatchis AOD or HD-DVD.

o Warner Bros. Pictures has developedits own system, called HD-DVD-9.

o Taiwan has created the Forward

Versatile Disco Sony has developed XDCAM and

ProData.


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The future holds a whole lot more than 25to 54 GB on a single disc. Time is nearwhen there will be discs that will blow away

the hard disc in most of our PCs in termsstorage capacity, holding 500 GB of datausing ultraviolet lasers, which have an evenshorter wavelength than the blue.

Meanwhile, we have Blu-ray to serve ourneeds.


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Blu Ray Discs1

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