Flexible disk

Details Flexible disk Flexible disk

1984-11-13

1987-03-24

Robinson, Ellis P.

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

427 44, 427 541, 427131, 427128, 428 64, 428215, 428216, 428694, 428900, 4285375, 428137, 428195, G11B 572

Patent

active

046524800

ABSTRACT:
A flexible disk comprises a flexible disk jacket having a central opening and a disk-like magnetic recording medium having a central opening smaller than the central opening of the flexible disk jacket in diameter. The recording medium is accommodated for rotation in the flexible disk jacket so that their central openings are concentrically positioned and the portion of the recording medium surrounding the central opening is exposed through the central opening of the jacket, thereby giving access thereto. The portion of the recording medium surrounding the central opening is provided with a protective layer on one side thereof and a reinforcement ring on the other side thereof. The protective layer is formed of a composition which contains a compound with at least one unsaturated bond per molecule that is polymerizable by ultraviolet rays, and which has been cured by exposure to ultraviolet rays.

REFERENCES:
patent: 3466156 (1969-09-01), Peters
patent: 4052750 (1977-10-01), Barber
patent: 4387114 (1983-06-01), Conner
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

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