Thursday, July 19, 2018
Search
  
Submit your own News for
inclusion in our Site.
Click here...
Breaking News
TSMC Cuts Sales, Spending Outlook
Alphabet to Deploy Balloon Internet in Kenya
New Xiaomi Mi Max 3 has a 6.9-inch Screen But Only 1080p
Corning Gorilla Glass 6 Promises Improved Durability for Mobile Devices
Samsung's Foldable Phone Coming Next Year, WSJ Claims
Microsoft Could Release New Xbox Hardware Next Month
European Commission Fines Google $5 billion For Illegal Practices Regarding Android Devices
Sony Releases New SXRD Full HD Reflective LCD and Signal Processing Drive LSI for Portable Projectors
Active Discussions
Which of these DVD media are the best, most durable?
How to back up a PS2 DL game
Copy a protected DVD?
roxio issues with xp pro
Help make DVDInfoPro better with dvdinfomantis!!!
menu making
Optiarc AD-7260S review
cdrw trouble
 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 Releases New SXRD Full HD Reflective LCD and Signal Processing Drive LSI for Portable Projectors
New Xperia XA2 Plus Features a 18:9 Display and Sony's Hi-Res Audio Technology
Sony at E3: Death Stranding, The Last of Us Part II, Spider-Man, Nioh 2, and More
New Sony 0.5-type OLED Microdisplay Supports UXGA Resolution and the World's Smallest Pixel Pitch
Sony to Spend $2.3bn to Make EMI Music Full Subsidiary, Outlines Content-centric Strategy
Sony SPRESENSE IoT Boards Come With Multi-core CPU and GNSS Receiver Onboard
Sony Says God of Wars Sold More Than 3.1 M Copies in Three Days
Sony Profits Soar to $4.5 bn on Image Sensor Sales, Movies
Sony's DPT-CP1 Paper E Ink Tablet Coming Early June
Sony's Xperia XZ2 Premium Brings Ultra-high Sensitivity Dual Camera, 4K HDR Movie Recording and Display
New Sony a7 III 24MP Full Frame Mirrorless Camera Retails For Less Than $2,000
Sony's New Xperia XZ2 Supports 4K HDR Video Recording

Most Popular News
 
Home | News | All News | Reviews | Articles | Guides | Download | Expert Area | Forum | Site Info
Site best viewed at 1024x768+ - CDRINFO.COM 1998-2018 - All rights reserved -
Privacy policy - Contact Us .