50-mm CAD-MSR disk system with blue laser

Yoshiteru Murakami; T. Numata; N. Ogata; N. Takamori; S. Maeda; Akira Takahashi; Yasuhito Tanaka; Yoshihiro Muto; M. Nishida; Masayoshi Kanno; Ariyoshi Nakaoki; K. Fujiie

doi:10.1117/12.453375

10 January 2002 50-mm CAD-MSR disk system with blue laser

Yoshiteru Murakami, T. Numata, N. Ogata, N. Takamori, S. Maeda, Akira Takahashi, Yasuhito Tanaka, Yoshihiro Muto, M. Nishida, Masayoshi Kanno, Ariyoshi Nakaoki, K. Fujiie

Author Affiliations +

Proceedings Volume 4342, Optical Data Storage 2001; (2002) https://doi.org/10.1117/12.453375
Event: Optical Data Storage, 2001, Santa Fe, NM, United States

Abstract

A mobile magneto-optical disk system with 2 Gbytes user- capacity is proposed. The disk consists of a center aperture detection type of magnetically induced super-resolution medium, a 0.5 mm thickness substrate with 50 mm in diameter, and a newly developed UV curing resin film to keep the disk tilt small even if its surrounding environmental condition changes. The optics contains a blue laser diode of a 406 nm wavelength and an objective lens with a numerical aperture of 0.6. A laser pulsed magnetic field modulation method is employed and it realizes land and groove recording with an effective track pitch of 0.40 micrometers . Practicable system margin values are confirmed at 0.146 micrometers bit density.

Citation Download Citation

Yoshiteru Murakami, T. Numata, N. Ogata, N. Takamori, S. Maeda, Akira Takahashi, Yasuhito Tanaka, Yoshihiro Muto, M. Nishida, Masayoshi Kanno, Ariyoshi Nakaoki, and K. Fujiie "50-mm CAD-MSR disk system with blue laser", Proc. SPIE 4342, Optical Data Storage 2001, (10 January 2002); https://doi.org/10.1117/12.453375

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