Title:
MAGNETO-OPTICAL DISK
Document Type and Number:
Japanese Patent JP2003323751
Kind Code:
A
Abstract:
To make tracing design easy for a disk drive by improving the de- tracking tolerance in a magneto-optical disk of a domain wall displacement ultra-resolution image reproduction system (ex. DWDD reproduction system).
When the group 251 width is Gw (group width Gw), and the land width Lw (land width), the group width Gw is made as follows: Gw≤0.046×(λ/NA). Especially, in the case of a group recording magneto-optical disk using an optical pickup of a laser wavelength λ: 80 nm, NA: 0.45, the group width Gw is made 790 nm or less.
Inventors:
TANAKA FUJI
TERAOKA YOSHIYUKI
ISHII TAMOTSU
WATANABE MAKOTO
TERAOKA YOSHIYUKI
ISHII TAMOTSU
WATANABE MAKOTO
Application Number:
JP2002129311A
Publication Date:
November 14, 2003
Filing Date:
April 30, 2002
Export Citation:
Assignee:
SONY CORP
International Classes:
G11B7/007; G11B7/09; G11B11/105; G11B20/12; G11B20/14; G11B20/18; G11B27/24; G11B27/30; G11B27/32; (IPC1-7): G11B11/105
Attorney, Agent or Firm:
Akira Koike (2 outside)