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[BIZ] 30GB per (HD) DVD-R da Toshiba

Aperto da Turrican3, 19 Luglio, 2005, 14:25:05

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Fonte: Nikkei

Toshiba Prototypes 30 GB, Double Layer DVD-R Disc

Jul 19, 2005 16:50

Both the Layer 0 and Layer 1 have been verified standard quality playback signals.

At the ISOM/ODS '05 event, Toshiba Corp. presented recording and readout results of the HD DVD-R DL, the company's new double layer HD DVD-R disc with a capacity of 30 GB. Toshiba revealed details of the prototype, following a press meeting in May 2005, at which the company only showed its playback signals. Along with the development of an organic dye for the recording layer, the company also established a manufacturing process requiring lower costs than the previous DVD-R DL manufacturing process.

To make an HD DVD disc double-layered, the company needed to reduce the thickness of the Ag reflection layer, located closer to the optical head, so the laser beam can reach the other layer (Layer 0) easily. However, the thinner the Ag reflection layer gets, which also works as a heat sink, the weaker its heat releasing effects become; and therefore the larger heat interferences between recorded marks grow. Toshiba overcame these problems with an organic dye with good heat conductivity, newly developed in conjunction with raw material manufacturers. This dye is a low to high polarity dye, which increases reflection when exposed.

Conventional 2P (photopolymer) process is used to form the middle layer. In existing double layer DVD-R media, disposable polyolefin stampers are used to transcribe the recording layer's concavities and convexities onto the photopolymer. Toshiba has employed 0.6 mm-thick, polycarbonate injection molded stampers instead of the polyolefin stampers. As a result, polycarbonate once used in stampers can be reused as alternative dummy substrates.