Analyses of Signals from Dual-Layer Phase Change Optical Disks
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概要
- 論文の詳細を見る
The signals obtained from dual-layer optical disks were analyzed experimentally and theoretically with emphasis on reducing layer cross talk (LCT) and spherical aberration (SA). Using the dual-layer phase change optical disk, the DC element of the LCT was measured and phase change marks were written on both layers. Diffraction calculations were used to explain the experimental results and to determine the amount of LCT and signal degradation caused by SA as functions of spacer layer thickness and optical detector size. Analytical methods to estimate LCT and SA were proposed, and their predictions turned out to agree well with the experimental and diffraction calculation results. These findings indicate that for a blue laser, the conventional techniques cannot simultaneously keep the LCT and SA to within practical values. Accordingly, designs for disks and drives for dual-layer optical disks are discussed.
- 2003-09-15
著者
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Terao Motoyasu
Central Resarch Laboratory Hitachi Ltd.
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Andoo Keikichi
Central Research Laboratory Hitachi Ltd.
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Ariyoshi Tetsuo
Central Research Laboratory Hitachi Ltd.
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Shintani Toshimichi
Central Research Laboratory Hitachi Ltd.
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Anzai Yumiko
Central Research Laboratory Hitachi Ltd.
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Hirotsune Akemi
Central Research Laboratory Hitachi Ltd.
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Miyamoto Harukazu
Central Research Laboratory Hitachi Ltd.
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Maeda Takeshi
Central Research Laboratory Hitachi Ltd.
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Hirotsune Akemi
Central Research Laboratory, Hitachi, Ltd., 1-280 Higashi-Koigakubo, Kokubunji, Tokyo 185-8601, Japan
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Maeda Takeshi
Central Research Laboratory, Hitachi, Ltd., 1-280 Higashi-koigakubo, Kokubunji, Tokyo 185-8601, Japan
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Terao Motoyasu
Central Research Laboratory, Hitachi, Ltd., 1-280 Higashi-koigakubo, Kokubunji, Tokyo 185-8601, Japan
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Miyamoto Harukazu
Central Research Laboratory, Hitachi, Ltd., 1-280 Higashi-Koigakubo, Kokubunji, Tokyo 185-8601, Japan
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Shintani Toshimichi
Central Research Laboratory, Hitachi, Ltd., 1-280 Higashi-Koigakubo, Kokubunji, Tokyo 185-8601, Japan
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Andoo Keikichi
Central Research Laboratory, Hitachi, Ltd., 1-280 Higashi-koigakubo, Kokubunji, Tokyo 185-8601, Japan
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Anzai Yumiko
Central Research Laboratory, Hitachi, Ltd., 1-280 Higashi-Koigakubo, Kokubunji, Tokyo 185-8601, Japan
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