Ultrahigh-capacity multidata layer ROM

Tetsuya Nishida; Yumiko Anzai; Takeshi Shimano; Kazuhiko Nakano; Nobuhiro Takeda; Jiroh Azuma; Toshihumi Takeuchi; Yoshito Tsunoda

doi:10.1117/12.251989

20 September 1996 Ultrahigh-capacity multidata layer ROM

Tetsuya Nishida, Yumiko Anzai, Takeshi Shimano, Kazuhiko Nakano, Nobuhiro Takeda, Jiroh Azuma, Toshihumi Takeuchi, Yoshito Tsunoda

Author Affiliations +

Proceedings Volume 2890, Optical Recording, Storage, and Retrieval Systems; (1996) https://doi.org/10.1117/12.251989
Event: Photonics China '96, 1996, Beijing, China

Abstract

We have developed an ultra-high-capacity double-sided multi- data-layer ROM that includes additional UV-cured-resin space-layers on two polycarbonate (PC) substrates. This ROM is made using the photo-polymerization (2P) method and has a structure that bonds the two substrates together. In a double-sided dual-data-layer ROM, using the smallest mark size of 0.44 micrometers with a 0.74-micrometer track-pitch for each layer provides a total data capacity of 17 GB using the 8-16 modulation method. Each side of the double-sided dual-sided dual-data-layer ROM consists of a Si-rich silicon nitride semi-reflective layer (layer 0 or 2) on a 570- micrometers-thick PC substrate and an Al reflective layer (layer 1 or 3) on an additional 50-micrometer-thick space layer. We achieved a base jitter of less than 8 percent and a radial tilt margin of 0.7 degree for all four data layers. We also examined the double-sided multi-data-layer ROM disc structure, and demonstrated the feasibility of the double- sided tri-data-layer ROM that includes a total of six layers and has an ultra-high capacity of 25.5 GB.

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Tetsuya Nishida, Yumiko Anzai, Takeshi Shimano, Kazuhiko Nakano, Nobuhiro Takeda, Jiroh Azuma, Toshihumi Takeuchi, and Yoshito Tsunoda "Ultrahigh-capacity multidata layer ROM", Proc. SPIE 2890, Optical Recording, Storage, and Retrieval Systems, (20 September 1996); https://doi.org/10.1117/12.251989

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