Flexible magnetic disk

Details Flexible magnetic disk Flexible magnetic disk

1984-03-21

1985-06-11

Kilgore, Robert M.

Dynamic magnetic information storage or retrieval

Record medium

In container

360 99, 360132, G11B 2302, G11B 5016

Patent

active

045232466

ABSTRACT:
A flexible magnetic disk comprises a jacket and a flexible magnetic disk sheet housed in the jacket. The flexible magnetic disk is provided at the center with a circular hole for engagement with a sheet positioning member of an information writing and read-out apparatus. The jacket has an aperture for exposing the circular hole of the flexible magnetic disk sheet. The peripheral edge portion of the circular hole which comes into contact with the sheet positioning member is provided with at least one lubricant layer to decrease the coefficient of friction of the peripheral edge portion to 0.45 or less, so that the flexible magnetic disk sheet is correctly positioned by the sheet positioning member.

REFERENCES:
patent: 4223361 (1980-09-01), Zaitsu
patent: 4374404 (1983-02-01), Davis
patent: 4376293 (1983-03-01), Teramura
patent: 4413298 (1983-11-01), Pecsok
patent: 4419164 (1983-12-01), Martinelli
patent: 4430678 (1984-02-01), Hack

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