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World of Blu-ray Drive > Blu-ray technology descriptions¡iStable and secure with large data capacity¡j

Rushing wave of digitization
High-definition programs viewed and recorded on personal computers
Blu-ray plays a principal role in the video lifestyle
So get started with Blu-ray right now
What kind of technology is Blu-ray?
Stable and secure with large data capacity
Structure and types of Blu-ray discs
Methods for using a Blu-ray Drive
Technologies of Pioneer
 

Blu-ray is the evolution of an optical disc technology accumulated with DVD and CD. In other words, the more plentiful the optical disc (including laser discs or "LD") related technological amassment, the more advantageous for creating high performance and highly reliable products. Track pitch is only 0.32 microns, which is less than half the 0.74 microns of DVD-RW. The minimum mark length is only 0.149 microns, compared to 0.4 microns with DVD-RW. Blu-ray technology is a challenge to DVD and CD in terms of its thinness and extreme precision, and is incomparable.



It is necessary to focus laser beams on Blu-ray as well as DVD discs with a lens, to expose the recording layer on the disc with a perfectly matched focus. A lens with an aperture of 0.085 is used to squeeze a high-frequency bluish violet laser onto a beam spot diameter that is only one-fifth the size those on DVD discs. The "aperture number" is an evaluation axis for representing the resolution of a lens and a markedly precise lens (compared to 0.6 of a DVD) is used for Blu-ray.



In order to accurately expose a laser beam onto a small beam spot in data tracks, with even smaller spacing than a DVD, the accuracy of the operation of the pickup needed to be thoroughly improved. Not even a drift by a fraction of a micron could be permitted. Furthermore, in order to instantaneously track problems arising in the disc, such as vibration on the disc while spinning or the eccentricity of the disc itself, a strong yet accurate servo mechanism needed to be developed. The performance of the drive is significantly impacted by not only the mechanical accuracy but also by other factors, such as the superiority or inferiority of the control technologies.

A high speed data transfer rate is also important. The data transfer rate of BS digital broadcasting, for example, is very high and can reach up to a maximum of 24Mbps, requiring a disc capacity of 10GB or more to store one hour of recording. Since a minimum of 35Mbps is secured for the data transfer speed of the latest BD, there is ample margin to deal with the recording of high-definition broadcasting, and high capacity data can also be copied at high speeds.