Dr. Sumio Ashida Profile

Dr. Sumio Ashida

at Toshiba Corp

SPIE Involvement:

Author

Publications (5)

Proceedings Article | 11 July 2007 Paper

Development of 40 GB dual-layer rewritable HD DVD media

Yasuhiro Satoh, Tsukasa Nakai, Sumio Ashida

Proceedings Volume 6620, 66202A (2007) https://doi.org/10.1117/12.738922

KEYWORDS: Digital video discs, Thermal analysis, Interfaces, Reflectivity, Radium, Crystals, Mechatronics, Tellurium, Germanium antimony tellurium, Oxides

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Proceedings Article | 9 September 2004 Paper

The Effect of Boundary Thermal Resistance on HD DVD-ARW Optical Recording Media

Tsukasa Nakai, Sumio Ashida, Kenji Todori, Keiichiro Yusu, Katsutaro Ichihara, Shin'ichi Tatsuta, Naoyuki Taketoshi, Tetsuya Baba

Proceedings Volume 5380, (2004) https://doi.org/10.1117/12.567626

KEYWORDS: Molybdenum, Resistance, Thermal effects, Thin films, Optical recording, Diffusion, Digital video discs, Temperature metrology, Interfaces, Titanium

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Proceedings Article | 16 September 2003 Paper

Dual-layer phase-change recording media for system with NA of 0.65 and light incidence on 0.6-mm-thick substrate

Takayuki Tsukamoto, T. Nakai, Sumio Ashida, Keiichiro Yusu, Katsutaro Ichihara, Noritake Ohmachi, Naoki Morishita, N. Yoshida, Naomasa Nakamura

Proceedings Volume 5069, (2003) https://doi.org/10.1117/12.532422

KEYWORDS: Interfaces, Lithium, Bismuth, Reflectivity, Germanium antimony tellurium, Transmittance, Optical discs, Crystals, Diffusion, Digital recording

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Proceedings Article | 16 September 2003 Paper

Phase-change recording media of 20-GB capacity for system with 0.6-mm-thick substrate

Noritake Ohmachi, Akihito Ogawa, Naoki Morishita, Naomasa Nakamura, Keiichiro Yusu, Sumio Ashida, Takayuki Tsukamoto, Katsutaro Ichihara

Proceedings Volume 5069, (2003) https://doi.org/10.1117/12.532417

KEYWORDS: Optical recording, Objectives, Transparent conducting films, Interfaces, Crystals, Semiconductor lasers, Diffusion, Bismuth, Absorption, Data modeling

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Proceedings Article | 10 January 2002 Paper

Experimental study of 28-GB optical disk using a blue laser

Hiroshi Hasegawa, Shintaro Takehara, Akihito Ogawa, Hideaki Ohsawa, Naomasa Nakamura, Keiichiro Yusu, Sumio Ashida

Proceedings Volume 4342, (2002) https://doi.org/10.1117/12.453377

KEYWORDS: Optical discs, Objectives, Semiconductor lasers, Signal processing, Monochromatic aberrations, Light sources, Digital video discs, Data storage, Head, Relays

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