Flexible magnetic recording medium with improved reinforcement m

Details Flexible magnetic recording medium with improved reinforcement m Flexible magnetic recording medium with improved reinforcement m

1980-08-04

1983-01-25

Tupper, Robert S.

Dynamic magnetic information storage or retrieval

Record medium

Disk

156238, G11B 502, B44C 3100

Patent

active

043706894

ABSTRACT:
A magnetic recording medium in the form of a floppy disk having a flexible body formed from a substrate and a magnetic coating on at least one of the two faces of the substrate. The body has a central hole concentric with the central axis of the disk and at least one of the faces of the body is provided with a reinforcing ring of a suitable material capable of being hot stamped, such as foil. The ring is directly bonded by being hot stamped under heat and pressure and without adhesive to the body in surrounding relationship to the hole. A second ring can be provided on the opposite side of the body in surrounding relationship to the hole and directly bonded to the body in the same manner as the first-mentioned ring. The rings can be electrically conductive or non-conductive and out of contact with each other. A method for hot stamping a ring to the body includes simultaneously applying heat and pressure to a sheet of foil placed over the body supported on a base so that a ring is formed from the foil sheet and the ring is directly bonded to the body while the remainder of the foil sheet, if any, is separable from the body when the body is removed from the supporting base. A second method includes applying a foil disk to the body before a hole is cut into the body; thereafter, the hole is formed, leaving the ring on the body in surrounding relationship to the hole.

REFERENCES:
patent: 4052750 (1977-10-01), Barber et al.
patent: 4071869 (1978-01-01), Feierabend et al.

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