Magnetic recording medium with specified transverse and machine direction Young's modulus of the polyester film base
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United States of America Patent
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May 30, 1995
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N/A
app pub date -
Nov 19, 1993
filing date -
Nov 20, 1992
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Abstract
The present invention provides a magnetic recording medium such as a magnetic tape suitable for long play with the thickness of the magnetic tape bring less than or equal to 12.5 without degrading the electro-magnetic conversion characteristic of the head-tape contact characteristic of the magnetic tape. The magnetic tape comprises a non-magnetic film base of thickness dA and a magnetic layer on the non-magnetic film base of thickness dM with the ratio of dA/dM.ltoreq.3.6 and a cupping rate defined as a ratio (A/B.times.100%) of a height A of a curled tape to a width B of curled tape in the traversing direction of .ltoreq.10%. The non-magnetic film vase has a first Young's modulus Y(MD) is a longitudinal direction of the magnetic recording medium and a second Young's modulus Y(TD) in a traversing direction thereof, wherein the first and second Young's modulusli y(MD) and Y(TD) respectively satisfy inequalities (1), (2) defined as follows: Y(TD).gtoreq.Y(MD)/3+1000 (Kg/mm.sup.2) . . . (1) Y(TD).gtoreq.1100 (Kg/mm.sup.2) . . . (2)
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