Wednesday, August 05, 2015
Search
  
Submit your own News for
inclusion in our Site.
Click here...
Breaking News
New PC Accessories For Windows 10
Xbox Unveils New Game Lineup
Nero TuneItUp Gets Windows-based PCs Back In Shape
Seagate Micron Alliance Introduce New SAS Solid State Drive
SanDisk and SK Hynix Expanded IP and Commercial Relationship
WD and 20th Century Fox Partner to Offer 4K UHD Movies
Toshiba Announces Third Generation of Enterprise SAS SSDs, Starts Production Of 3D NAND
Xiaomi Has Reclaimed Top Spot in China, Huawei Pushes Ahead of Apple
Active Discussions
How to back up a PS2 DL game
Copy a protected DVD?
roxio issues with xp pro
How to burn a backup copy of The Frozen Throne
Help make DVDInfoPro better with dvdinfomantis!!!
Copied dvd's say blank in computer only
menu making
Optiarc AD-7260S review
 Home > News > Optical Storage > Sony De...
Last 7 Days News : SU MO TU WE TH FR SA All News

Friday, September 21, 2001
Sony Develops Blue-Purple LEDs with Small Aspect-Ratio of 2.3


Sony has developed a large output blue-purple semiconductor laser diode with a small laser beam aspect ratio of 2.3.

The company announced it at the "2001 Autumn Japan Society of Applied Physics (JSAP)" annual meeting held Sept. 11-14 at Aichi Institute of Technology.

If the laser beam aspect ratio is lowered within the range of 2 and 2.5, it becomes easier to assemble a semiconductor laser into an optical pickup for an optical-disk apparatus. Based on the judgment of its blue-purple LED's life and reliability characteristics being reached to the commercialization level of volume production, Sony is setting the next development target "to realize the blue-purple LEDs with prominent characteristics, which will be easy to use for the optical disk apparatus manufactures," such as to lower the laser beam aspect ratio.

In order to realize the reduction of laser beam aspect ratio, it is necessary to expand the far field pattern of the laser beam to the direction of the horizontal plane along the activated layer of the element, and to shrink to a vertical direction.

The far field pattern of the light emission spot at the plane of the diode element edge is reversed against the beam spot figure along the activated layer plane. Therefore, in the development of this LED, Sony tried to process the figure of the light emission spot, which spreads out within the activated layer plane of the element, as 1) to shrink the beam spot to a direction of the horizontal plane along the activated layer, and 2) to expand to the vertical direction of the activated layer.

As for the LED elements with a large aspect ratio of 3.2, Sony said it already has realized the characteristics of volume production level. The major LED characteristics of its announcement are as follows: 1) the threshold current of 34.3mA and threshold voltage of 4.1V, 2) the operation current of 56mA and operation voltage of 4.6V at its continuous oscillation with a light output power of 30mW, and 3) the mean time to failure of the LED at an operating temperature of 60 degrees Celsius, and at its continuous oscillation with a light output power of 30mW is estimated to be around 15,000 hours from the experimental life test slope of the characteristics. This MTTF and other characteristics shows the LED devices of this development are well within the level of commercialization.


Previous
Next
TDK to Market Flat Speakers Made of Glass Fiber        All News        TDK to Market Flat Speakers Made of Glass Fiber
TDK to Market Flat Speakers Made of Glass Fiber     Optical Storage News      TDK to Market Flat Speakers Made of Glass Fiber

Source Link Get RSS feed Easy Print E-Mail this Message

Related News
Sony's Midrange Xperia C5 Ultra and M5 Smartphones Come With Strong Cameras
Sony Profit Rises Following Demand For Mobile Cameras
Android Lollipop Rolls For the Xperia Z3 and Xperia Z2 Series
Sony Mobile and ZMP to Develop Enterprise Solutions that Utilize Autonomous Unmanned Aerial Vehicles
Sony's New Wireless Speakers Available In The U.S.
Sony Launches Crowdfunding Platform For Its Products
Android M Developer Preview Available for Xperia Devices
First Sony X900C and X910C Ultra-thin 4K Ultra HD TVs Launching
Sony Has Three New Cameras For You
Android 5.0, Lollipop Rolls for the Xperia Z Series, Android 5.1 coming for Xperia M2 and Xperia M2 Aqua
Sony Delivers New Entry-level Professional Camcorder, New 4K Laser Projection Options And Professional Laser and Lamp Projectors
Sony to Acquire Optical Archive As It Enters The Data Center Storage Market

Most Popular News
 
Home | News | All News | Reviews | Articles | Guides | Download | Expert Area | Forum | Site Info
Site best viewed at 1024x768+ - CDRINFO.COM 1998-2015 - All rights reserved -
Privacy policy - Contact Us .