Dynamic information storage or retrieval – Storage medium structure – Optical track structure
Patent
1992-03-27
1993-03-30
Hannaher, Constantine
Dynamic information storage or retrieval
Storage medium structure
Optical track structure
369 13, 360 59, 360114, 365122, G11B 1304
Patent
active
051990229
ABSTRACT:
A magneto-optical data reading member includes a transparent disk substrate, and land-shaped areas formed on the disk substrate in a spiral manner so as to be parallel with each other, and groove-shaped areas formed to be stepped with respect to the land-shaped areas, wherein each of the land-shaped and groove-shaped areas has, in a surface region thereof, a first magnetic film for reading data having a predetermined Curie temperature and a predetermined magnetic coercive force, and a second magnetic film for reading data, formed on the first magnetic film, having a Curie temperature higher than the predetermined Curie temperature and a magnetic coercive force higher than the predetermined magnetic coercive force, and having a plurality of memory pits in series according to the information data to be recorded.
REFERENCES:
patent: 4771347 (1988-09-01), Horimai et al.
patent: 4923765 (1990-05-01), Takayama et al.
patent: 5051970 (1991-09-01), Ishii et al.
patent: 5143798 (1992-09-01), Fujii
Nikkei Electronics 1991, 3.4 (No. 521) p. 92.
Suzuki Katsumi
Yokota Tsuneshi
Yoshimaru Tomohisa
Hannaher Constantine
Kabushiki Kaisha Toshiba
Nguyen Kiet T.
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