Flexible magnetic disk

Details Flexible magnetic disk Flexible magnetic disk

1985-02-28

1987-11-17

Robinson, Ellis P.

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

427 44, 427 541, 427128, 427131, 428 64, 428137, 428141, 428143, 428148, 428195, 4284259, 428522, 428694, 428695, 428900, G11B 572

Patent

active

047073926

ABSTRACT:
A flexible magnetic disk in which the friction between the magnetic sheet of the disk and a positioning member is reduced, the magnetic sheet is positioned properly and without offset each time it is loaded in a reading/reproducing device, and the tracking accuracy and dimensional accuracy are satisfactory. A protective layer is provided around the periphery of a central hole in the magnetic sheet. The protective layer is made of a composition containing a compound which has an acrylic or methacrylic acid ester bond at one or both of a main chain terminal and a side chain thereof. The compound is one which is cured by radiation. The thickness of the protective layer should be 30 microns or less, and the surface irregularity of the protective layer should be 0.03 microns or more represented in terms of a central line average roughness at a cutoff of 2.5 mm.

REFERENCES:
patent: 3466156 (1969-09-01), Peters
patent: 3681225 (1972-08-01), Genma
patent: 4239828 (1980-12-01), Knope
patent: 4335183 (1982-06-01), Hosaka
patent: 4368239 (1983-01-01), Nakajima
patent: 4387114 (1983-06-01), Conner
patent: 4404247 (1983-09-01), Dominguez-Burquette
patent: 4434210 (1984-02-01), Nakajima
patent: 4486500 (1984-12-01), Naruo
patent: 4523246 (1985-06-01), Okuzawa
patent: 4539220 (1985-09-01), Martinelli
patent: 4578299 (1986-03-01), Kato
patent: 4581270 (1986-04-01), Kato
patent: 4647473 (1987-03-01), Kato
patent: 4652480 (1987-03-01), Kato

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