Transcript
Holographic Versatile Disc
ContentsIntroduction to HVDBasics of Holographic MemoryCloser look at HVDThe HVD system: Writing dataThe HVD system: Reading dataMajor competitorsHow HVD comparesConclusionReferences
Introduction to HVD
• Optical disc• Data storage up to 3.9
TB• Data transfer rate is 1
Gbps• Next-next generation
technology• HVD alliance, led by
Optware Corporation, Japan
• Toshiba, Panasonic, Fuji photo film, Intel Capital and Konica Minolta
HVD
Basics of Holographic Memory
• Holography is a method of recording patterns of light to produce a 3-D object
• Recorded patterns of light are Hologram• Focused beam of light, hence Laser
• Laser beam split into two: Reference & Information
• Reference remains unchanged
• Information beam encounters object, carries that image in its waveform
• These beams intersect creating Light Interference
• This is recorded on Photographic plate generating hologram
Holographic recording
• Shine reference/reconstruction beam on Hologram
• Reflected wave consists the light pattern of the image stored in hologram
• Reconstructed wave sent to CMOS sensor to recreate original image
Reconstruction
• Recording layer placed between 2 substrate layers
- Dichoric mirror layer reflects blue light, which reads data encoded as interference fringes
- Aluminum reflection layer reflects red light, which acts as reference beam, tracks the reading position
Cross section of HVD
The HVD system: Writing data
• Laser source• Beam splitter/merger• Mirrors• Spatial light
modulator (SLM)• CMOS sensor • Photopolymer
recording medium
HVD write system
• Information is encoded into binary data & stored in SLM
- 1’s & 0’s converted into opaque & translucent areas on a page
- This page acts as image through which info beam is going to pass
• Firing of laser beam- portions of light are
blocked by opaque areas of the page
- portions pass through the translucent areas
- thus info beam carries image
Page data stored as hologram
• When reference & information beam rejoin on same axis, creating a pattern of light interference i.e. the holography data
• This joint beam carries the interference pattern to the photopolymer disc & stores it there as a hologram.
The HVD system: Reading data
• Laser projects light beam (identical to reference beam) onto the hologram
• Hologram diffracts this beam according to specific pattern of light interference it is storing
• Resulting light recreates the image of the page data that established the light-interference pattern in the first place
Read system 1
• When reconstruction beam bounces back off the disc, it travels to the CMOS sensor.
• CMOS sensor then reproduces the page data.
Page data in an HVD and recreated CMOS
sensor
Major competitors Optware Corporation, Japan Founded in 1999 Toshiba Corp, Fuji Films,
Panasonic etc
InPhase Technologies, Colorado
Founded in 2000 Hitachi Maxell, Bayer
MaterialScience etc 40 patents associated with
holographic technology
DVD V/S HVD
How HVD compares
Blu-ray HD DVD HVD
Initial cost for recordable disc
$18 $10 $120-180
Initial cost for recorder/player
$2000 $2000 $18000
Initial storage capacity
27 GB54 GB
15 GB30 GB
200 GB-300GB
Read/write speed
36.5 Mbps
36.5 Mbps
1 Gbps
Conclusion
o More storage spaceo Greater access rate o Major drawback: Cost is too higho Initial target customers: Big businesseso Consumer devices could hit the market
around 2010
References
www.inphase-technologies.com http://electronics.howstuffworks.com/
hvd.htm http://en.wikipedia.org/wiki/
Holographic_Versatile_Disc www.tech-faq.com/hvd.shtml http://hvd-forum.org/abouthvd/
technology.html
Thank you
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