Magnetic disc apparatus with liner that avoids bent edges of mag

Details Magnetic disc apparatus with liner that avoids bent edges of mag Magnetic disc apparatus with liner that avoids bent edges of mag

1985-04-17

1987-03-31

Tupper, Robert S.

Dynamic magnetic information storage or retrieval

Record medium

In container

G11B 2304

Patent

active

046547410

ABSTRACT:
A magnetic disc apparatus obtained by housing in a cartridge case, a magnetic disc which is obtained by forming a metallic magnetic sheet on a polymer base and liner sheets. The liner sheet which is installed between the magnetic disc and the cartridge case has an outer diameter which is smaller than the diameter of the magnetic disc, and an inner diameter which is greater than the rotational diameter of an index hole that is prepared on the magnetic disc for detecting the rotational position of the disc. By arranging in this manner, a smooth rotation of the magnetic disc can be accomplished by avoiding the contact with liner sheet of the edges on the outer periphery of the disc that were bent at the time the disc was punched from the magnetic recording medium, and of the edges of the index hole that were bent at the time the index hole was punched.

REFERENCES:
patent: 4263634 (1981-04-01), Chenoweth et al.
Bothun, "Encased . . . Wiper", IBM Tech Disc Bull, vol. 19, No. 12, May 1977, p. 4720.

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