Coating processes – Magnetic base or coating – Magnetic coating
Patent
1985-12-02
1987-07-14
Pianalto, Bernard D.
Coating processes
Magnetic base or coating
Magnetic coating
427128, 427131, 427132, 2041922, B05D 512
Patent
active
046801979
ABSTRACT:
A method of manufacturing a perpendicular magnetic recording floppy disk is disclosed. A first magnetic recording layer is formed by sputtering a perpendicularly magnetizable material on one side of a plastic film substrate. A second magnetic recording layer is formed by sputtering the perpendicularly magnetizable material on the other side of the plastic film substrate after forming the first magnetic recording layer. The second magnetic recording layer has a thickness greater than that of the first magnetic recording layer, when a curl of the first magnetic recording layer on the plastic film substrate, resulting from forming the first magnetic recording layer on the plastic film substrate, is to the outside. On the other hand, the second magnetic recording layer has a thickness lower than that of the first magnetic recording layer, when a curl of the first magnetic recording layer on the plastic film substrate is to the inside.
REFERENCES:
patent: 4423454 (1983-12-01), Felleisen et al.
Patent Abstracts of Japan, vol. 6, No. 59, Apr. 16, 1982, JP-A-56-169220.
Patent Abstracts of Japan, vol. 6, No. 162, Aug. 25, 1982, JP-A-57-78627.
Nishikawa Reiji
Sagoi Masayuki
Kabushiki Kaisha Toshiba
Pianalto Bernard D.
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