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Proceedings Paper

50-mm CAD-MSR disk system with blue laser
Author(s): Yoshiteru Murakami; T. Numata; N. Ogata; N. Takamori; S. Maeda; Akira Takahashi; Yasuhito Tanaka; Yoshihiro Muto; M. Nishida; Masayoshi Kanno; Ariyoshi Nakaoki; K. Fujiie
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Paper 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.

Paper Details

Date Published: 10 January 2002
PDF: 8 pages
Proc. SPIE 4342, Optical Data Storage 2001, (10 January 2002); doi: 10.1117/12.453375
Show Author Affiliations
Yoshiteru Murakami, Sharp Corp. (Japan)
T. Numata, Sharp Corp. (Japan)
N. Ogata, Sharp Corp. (Japan)
N. Takamori, Sharp Corp. (Japan)
S. Maeda, Sharp Corp. (Japan)
Akira Takahashi, Sharp Corp. (Japan)
Yasuhito Tanaka, Sony Corp. (Japan)
Yoshihiro Muto, Sony Corp. (Japan)
M. Nishida, Sony Corp. (Japan)
Masayoshi Kanno, Sony Corp. (Japan)
Ariyoshi Nakaoki, Sony Corp. (Japan)
K. Fujiie, Sony Corp. (Japan)


Published in SPIE Proceedings Vol. 4342:
Optical Data Storage 2001

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