Magnetic disk comprising a flexible substrate and a plastic film

Details Magnetic disk comprising a flexible substrate and a plastic film Magnetic disk comprising a flexible substrate and a plastic film

1989-05-31

1991-10-29

Cashion, Jr., Merrell C.

Stock material or miscellaneous articles

Circular sheet or circular blank

Ornamental, decorative, pattern, or indicia

428694, 428900, 360 9704, 360135, G11B 582

Patent

active

050615378

ABSTRACT:
A magnetic disk comprising an annular flexible substrate and a magnetic layer on at least one substrate major surface is provided with a plastic film ring or a pair of plastic film rings along the outer periphery of the disk. The ring is adhesively secured to the disk on the substrate major surface. The ring thickness is controlled to a specific range relative to the substrate thickness, presenting a magnetic disk featuring stable operation and a minimized output variation.

REFERENCES:
patent: 3373413 (1968-03-01), Treseder
patent: 4897134 (1990-01-01), Doering
patent: 4943611 (1990-07-01), Todo et al.

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