Bookmark and Share


Ricoh has reportedly invented a technology, which allows a single laser to read and write all currently available types of optical discs, e.g., Blu-ray discs, CDs, DVDs and HD DVDs. Potentially, this may end the format war in the consumer electronics space, as all manufacturers will be able to support both competing standards – Blu-ray and HD DVD – without much additional spending.

The data layer of the Blu-ray discs is located 0.1mm from the disk’s surface, whereas the HD-DVD data layer has data layer depth of 0.6mm from the disk’s surface, the same as DVD disks, meanwhile CD’s data layer resides 1.1mm deep from the disk surface. In order to read or record the data, laser beam needs to be adjusted appropriately. According to EETimes web-site, Ricoh has invented a special component, which – a diffraction plate – which can “target” the laser beam at an appropriate data layer.

The 3.5mm diameter, 1mm thick round diffraction plate with minute concentric groves on both sides which function as a diffraction grating is placed between lasers and an objective lens. The diffraction grating is designed to adjust a light beam to an optimum incident ray relative to the objective lens so that light focuses on the proper position for each disk format.

Multi-format optical disc readers and recorders can recognize which format media is loaded. When the format is clear, Ricoh’s optical diffraction element adjusts the laser beam with its diffraction grating for each format and passes it to the objective lens. The lens then forms a beam spot at the appropriate depth for each disk format, the web-site cites the company as saying.

“This diffraction device is the first one that is ready for four formats, including BD and HD-DVD. It will make it possible to build players and recorders ready for all formats, which will benefit consumers,” a Ricoh spokesman is reported to have said.

Ricoh will demonstrate the device at International Optoelectronics Exhibition ‘06 outside Tokyo on July 12-14, 2006. The company plans to offer its new technology to its customers by year end. Initially, however, the diffraction plate will only be intended for players, as higher power lasers are required for recorders due to losses of the laser energy at the grating.


Comments currently: 1
Discussion started: 07/11/06 07:22:25 AM
Latest comment: 07/11/06 07:22:25 AM

Add your Comment

Related news

Latest News

Monday, July 28, 2014

12:11 pm | Intel Core i7-5960X “Haswell-E” De-Lidded: Twelve Cores and Alloy-Based Thermal Interface. Intel Core i7-5960X Uses “Haswell-EP” Die, Promises Good Overclocking Potential

Tuesday, July 22, 2014

10:40 pm | ARM Preps Second-Generation “Artemis” and “Maya” 64-Bit ARMv8-A Offerings. ARM Readies 64-Bit Cores for Non-Traditional Applications

7:38 pm | AMD Vows to Introduce 20nm Products Next Year. AMD’s 20nm APUs, GPUs and Embedded Chips to Arrive in 2015

4:08 am | Microsoft to Unify All Windows Operating Systems for Client PCs. One Windows OS will Power PCs, Tablets and Smartphones

Monday, July 21, 2014

10:32 pm | PQI Debuts Flash Drive with Lightning and USB Connectors. PQI Offers Easy Way to Boost iPhone or iPad Storage

10:08 pm | Japan Display Begins to Mass Produce IPS-NEO Displays. JDI Begins to Mass Produce Rival for AMOLED Panels

12:56 pm | Microsoft to Fire 18,000 Employees to Boost Efficiency. Microsoft to Perform Massive Job Cut Ever Following Acquisition of Nokia