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Proceedings Paper

Ultrahigh-capacity multidata layer ROM
Author(s): Tetsuya Nishida; Yumiko Anzai; Takeshi Shimano; Kazuhiko Nakano; Nobuhiro Takeda; Jiroh Azuma; Toshihumi Takeuchi; Yoshito Tsunoda
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Paper 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.

Paper Details

Date Published: 20 September 1996
PDF: 8 pages
Proc. SPIE 2890, Optical Recording, Storage, and Retrieval Systems, (20 September 1996); doi: 10.1117/12.251989
Show Author Affiliations
Tetsuya Nishida, Hitachi, Ltd. (Japan)
Yumiko Anzai, Hitachi, Ltd. (Japan)
Takeshi Shimano, Hitachi, Ltd. (Japan)
Kazuhiko Nakano, Nippon Columbia Co., Ltd. (Japan)
Nobuhiro Takeda, Hitachi, Ltd. (Japan)
Jiroh Azuma, Hitachi, Ltd. (Japan)
Toshihumi Takeuchi, Hitachi, Ltd. (Japan)
Yoshito Tsunoda, Hitachi, Ltd. (Japan)

Published in SPIE Proceedings Vol. 2890:
Optical Recording, Storage, and Retrieval Systems
Baogen Feng; Yoshito Tsunoda, Editor(s)

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