Stock material or miscellaneous articles – Structurally defined web or sheet – Edge feature
Patent
1991-04-18
1992-11-17
Thibodeau, Paul J.
Stock material or miscellaneous articles
Structurally defined web or sheet
Edge feature
834252, 83500, 360134, 428336, 428694, G11B 500
Patent
active
051642433
ABSTRACT:
A magnetic recording medium is disclosed, comprising a nonmagnetic support having thereon a magnetic layer on one surface of the nonmagnetic support and a backing layer on the other surface thereof and having a thickness of from 10 to 40 .mu.m, wherein the surface of an edge of the medium which is to be in contact with the inner surface of the flange of a reel of a magnetgic tape cassette, the flange being a base for aligning the edge of the medium when the medium is wound around the reel, is depressed in such a way that the cross sectional area of the depression portion (11) (FIG. 1), as defined by four lines involving an extension line (6) from the surface of the magnetic layer (4) at the edge, an extension line (7) from the surface of the backing layer (5) at the edge, a line (9) which is in tangential contact with the outermost face (8) of the cross section of the edge and which crosses the two extension lines (6) and (7) perpendicularly thereto and a peripheral line (10) of the face of the edge, is from 15 to 60 .mu.m, that the surface roughness (Ra) of the surface of the magnetic layer is 6.5 nm or more (with a cut-off value of 0.25 mm) and that the medium, as a whole, has a Young's modulus (M.sub.0.5) and 550 kg/mm.sup.2 or less. The medium has a high quality and may be wound-up to a tape cassette or the like to have a well aligned form therein in operation for FF(fast forward)/REW(rewind) mode in a VTR.
REFERENCES:
patent: 3850358 (1974-11-01), Nettles
patent: 4135031 (1979-01-01), Akashi et al.
patent: 4307637 (1981-12-01), Vanderhulst
patent: 4316927 (1982-02-01), Kimura et al.
patent: 4861674 (1989-08-01), Inaba et al.
Hayata Youichi
Kanazawa Minoru
Fuji Photo Film Co. , Ltd.
Resan Stevan A.
Thibodeau Paul J.
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