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Sony, Toppan develop 'paper' disk for Blu-ray

Posted: 21 Apr 2004 ?? ?Print Version ?Bookmark and Share

Keywords:blu-ray? sony? toppan printing? paper disk? optical data storage 2004?

Taking advantage of the Blu-ray disk's thick substrate structure, Sony Corp. and Toppan Printing Co. Ltd have developed a "paper" disk that can hold 25GB of video data. The two companies will present the development at the Optical Data Storage 2004 conference.

Blu-ray disks have a recording layer just 0.1mm from the surface. Only the 0.1mm thick protection layer, or cover layer, must be transparent for a laser beam to reach the recording layer.

Researchers at the two companies have been working for the last year on a paper material to support the 1.1mm substrate. The newly developed material uses paper pulp with plastic soaked into it. Over 51 percent of its weight is a pulp material, a Sony spokesman said.

Substrate thickness is greater than DVD disks. The thickness and stiffness of newly-developed material yielded a warp-free disk, a Toppan spokesman added.

The two companies suggested the paper disk could also reduce disk costs as well. But the disk technology is still at laboratory stage, and volume production technology has to be developed for practical applications, Toppan said.

- Yoshiko Hara

EE Times

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