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JVC develops BD/DVD disk to ease Blu-ray transition

Posted: 31 Dec 2004 ?? ?Print Version ?Bookmark and Share

Keywords:dvd? blu-ray disc? jvc? blu-ray? rom disc?

Hoping to ease the transition from DVD to Blu-ray Disc, JVC has developed a Blu-ray/DVD Combo ROM Disc, containing two DVD layers and one BD layer.

Earlier this month, toshiba and memory-tech developed a dual-layer DVD/HD DVD disk able to store both DVD and HD DVD content. JVC expects the Blu-ray/DVD disc to likewise enable customers to view both standard and high-definition video content. The company intends to propose the disc to the Blu-ray Disc Association next spring, with production to begin when BD-ROM players emerge in early 2006.

"We expect that standard definition (SD) and high-definition (HD) video contents would coexist for a certain period," said a JVC spokesman. "Even when a BD player/recorder is installed in a living room, people will want to watch SD contents using DVD players/recorders in other rooms," he said.

The Blu-ray/DVD combo ROM disc is a single sided disc with two DVD-ROM layers in the middle and one BD layer on top. These two platters are pasted together like a dual layer DVD disc, with a 0.1mm cover layer on the BD layer side.

Disc capacity is 33.5GB, including 8.5GB for DVD content and 25GB for BD content.

JVC developed a proprietary reflective film for the outer BD layer that reflects blue light but passes red light. During BD reproduction, a blue laser reads the outer BD layer. When a red laser reads the inner DVD dual layers, the BD layer is transparent to the red laser.

The development of the film was a breakthrough for the combo disc, the JVC spokesman added.

"The disc is suitable for volume production, which is almost comparable to simple BD-ROM discs," said the spokesman, who declined to reveal details. The combo disc's cost is estimated to be 20 to 30 percent higher than regular BD-ROM discs.

JVC expects the combo disc to undergo further development to fully meet the performance needs of both DVD and BD formats. "We are developing a dual BD layer combo disc with 50GB of capacity for BD contents and 8.5GB for DVD contents," the spokesman said.

- Yoshiko Hara

EE Times

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