Disc type magnetic recording medium

Details Disc type magnetic recording medium Disc type magnetic recording medium

1997-07-01

1999-08-10

Resan, Stevan A.

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

428141, 428694SL, 428694SG, 428694BA, 428694BH, 428900, G11B 582

Patent

active

059356740

ABSTRACT:
The present invention provides a disc magnetic recording medium which provides remarkable improvements in electromagnetic characteristics, particularly high density recording properties, and exhibits excellent magnetic properties with various sizes. A disc type magnetic recording medium is disclosed, comprising a substantially non-magnetic layer and a magnetic layer provided on a non-magnetic support in this order, said magnetic layer comprising a ferromagnetic metal fine powder or ferromagnetic hexagonal ferrite fine powder dispersed in a binder, wherein said non-magnetic support is an aramide or polyethylene naphthalate having a central plane average surface roughness SRa of not more than 10 mm and there is the following relationship between the thickness d (.mu.m) of the non-magnetic support and the outermost diameter D (mm) of the recording area:

REFERENCES:
patent: 4794042 (1988-12-01), Kubota et al.
patent: 4876137 (1989-10-01), Utsumi
patent: 4990400 (1991-02-01), Endo et al.
patent: 5377060 (1994-12-01), Nigam
patent: 5549955 (1996-08-01), Kawamata et al.

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