Stock material or miscellaneous articles – Circular sheet or circular blank – Recording medium or carrier
Patent
1983-06-17
1989-01-31
Pianalto, Bernard
Stock material or miscellaneous articles
Circular sheet or circular blank
Recording medium or carrier
2041922, 428213, 428458, 428480, 428694, 428900, B32B 302
Patent
active
048014818
ABSTRACT:
A perpendicular magnetic recording floppy disk comprises a flexible plastic film substrate, a first magnetic recording layer formed on one side of the plastic film substrate and having an axis of easy magnetization in a direction perpendicular to the one side of the plastic film substrate, and a second magnetic recording layer formed on the other side of the plastic film substrate and having an axis of easy magnetization in a direction perpendicular to the above-mentioned other side of the plastic film substrate. The second magnetic recording layer has a thickness greater than a thickness of the first magnetic recording layer.
REFERENCES:
patent: 3725611 (1973-04-01), Smaller
patent: 4343834 (1982-08-01), Saito et al.
patent: 4423454 (1983-12-01), Felleisen et al.
Patent Abstracts of Japan vol. 6, No. 59, 16 Apr. 1982 & JP-A-56-169220.
Patent Abstracts of Japan vol. 6, No. 162, 25 Aug. 1982 & JP-A-57-78627.
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Patent Abstracts of Japan vol. 5 No. 115; 24 Jul. 1981 & JP-A-56-54635.
Digests of the 5th Annual Conference on Magnetics in Japan 1981, P. 77 "Curling of Metal Evaporated Thin Film Tape", by T. Fujita et al.
Patent Abstracts of Japan vol. 5 No. 64; 30 Apr. 1981 & JP-A-56-16939.
Nishikawa Reiji
Sagoi Masayuki
Pianalto Bernard
Tokyo Shibaura Denki Kabushiki Kaisha
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