Wednesday, November 26, 2014
Search
  
Submit your own News for
inclusion in our Site.
Click here...
Breaking News
HP Reports Fiscal 2014 Full-Year and Fourth Quarter Results
Hitachi Wearable Device Monitors Brain Functions
Hitachi Technology Stores Digital Data In 100 Recording Layers, Data Can be Stored For 300 million Years
Sony To Provide Refunds To Users Over Misleading Ads For PlayStation Vita
Blu-ray Movie Discs Used As Templates For Improving Solar Cell Performance
PC Outlook Remains Cautious
Trade Your iPhone for BlackBerry Passport And Get $550
GreatFire.org Unblocks BBC Chinese
Active Discussions
Hi All!
cdrw trouble
CDR for car Sat Nav
DVD/DL for Optiarc 7191S at 8X
Copied dvd's say blank in computer only
Made video, won't play back easily
New Features In Firefox 33
updated tests for dvd and cd burners
 Home > News > Optical Storage > Sony Sh...
Last 7 Days News : SU MO TU WE TH FR SA All News

Wednesday, May 23, 2007
Sony Showcases Four-layer Micro-Reflector Holographic Recording System


Sony presented the results of its latest research in the multi-layer "Micro-Reflector recording" technology, a type of holographic recording.

In the Micro-Reflector recording technology, a laser light emitted from a blue violet semiconductor laser diode is split into two so that one irradiates the front side of a volumetric optical disc medium as a reference light, while the other is emitted to the back side as a recording light. By precisely aligning the focal points of the two laser beams using servo technology, the two counter-propagating light beams focus on the same point on the disc's holographic recording material. Their interference creates a diffraction-limited size fringe corresponding to a 1 bit of information. Changing the focal points results in recording in more layers. During reproduction, light is emitted on the front side of the medium.



Sony claims that the Micro-Reflector recording technology poses more advantages compared to other approaches of holographic storage. The recorded interference fringes are small enough to prevent the photopolymer from expanding and contracting due to temperature changes. This eliminates the need for adjusting the wavelength of the laser in accordance with the temperature - a problem commonly faced in Holographic storage technologies. In addition, Sony's recording system can use a common, commercially available blue-violet semiconductor laser diode. The system does not require the use of other components such as spatial light modulators, CMOS sensors or other parts, making its cost lower than other Holographic recording systems.

Sony's demonstration of reading/writing operations included an optical system with a wavelength of 405 nm and a numerical aperture (NA) of 0.5. The system involves 17pp modulation, already implemented by the Blu-ray Disc. The laser had an output power of 4.5 mW / 0.5 mW for the recording/reading operations, respectively. It's rotation speed was 70rpm (CAV), and the channel clock rate was 367 KHz.

Sony recorded data on a single layer at a recording density of 1.25 GB in a 12 cm-disk. The company says that it aims to achieve multi-layer recording by increasing the numerical aperture. In order to record on all four layers, Sony added optical parts to change the focal point depth.

The volumetric optical disc comprises a 0.25 mm thick photopolymer recording layer, sandwiched between two 0.6 mm glass substrates. The 12 cm disc included four layers capable of holding up to 1.25 GB per layer. The distance between adjacent layers was 50μm.

However, Micro-Reflector multi-layer recording does not avoid the issues met in multi-layer recording systems in general. The reproduction signal gets weaker as the system tried to read the deeper layers. In addition, a slow data rate is also listed as a problem.

Sony said that it plans to solve these issues in the future to achieve a storing capacity of 500 GB using 25-layer disc. The results of Sony's research were demonstrated at ODS 2007, currently held in Portland, U.S.A.


Previous
Next
Internet Advertising at Record High in 2006        All News        Moser Baer Unveils 8x Blu-ray Technology
Hitachi Maxell Releases Double-layer Blu-Ray Media     Optical Storage News      Moser Baer Unveils 8x Blu-ray Technology

Get RSS feed Easy Print E-Mail this Message

Related News
Sony to Reduce Smartphone, TV Lineups
New Sony Alpha 7 II Full-frame Mirrorless Camera Released
Sony Aims At Movie, TV Businesses
New Sony Exmor RS Stacked CMOS Image Sensor Supports Image Plane Phase Detection Signal Processing Function
Sony Unveils PlayStation Vue Cloud-Based TV Service
Sony's New Pocket SSD Drives Released In Europe
PlayStation 4 Sales Sustain Sony's Quarterly Loss
PS4 Remote Play Now Available for Xperia Z3 Series
Sony To Release Android Lollipop To Its Entire Xperia Xperia Z Series
New Sony Headphones, Portable Headphone DAC/Amplifier and Headphone Cables Support Hi-Resolution Audio
Sony Xperia Z3 Coming To The US
PlayStation TV Coming October 14th

Most Popular News
 
Home | News | All News | Reviews | Articles | Guides | Download | Expert Area | Forum | Site Info
Site best viewed at 1024x768+ - CDRINFO.COM 1998-2014 - All rights reserved -
Privacy policy - Contact Us .