Magnetic recording medium having a smooth biaxially...

Details Magnetic recording medium having a smooth biaxially... Magnetic recording medium having a smooth biaxially...

2005-12-27

2005-12-27

Resan, Stevan A. (Department: 1773)

Stock material or miscellaneous articles

Magnetic recording component or stock

Binder media

C428S847000

Reexamination Certificate

active

06979501

ABSTRACT:
A magnetic recording medium which includes a non-magnetic substrate having a front side and a backside, a longitudinal direction and a crossweb direction, with a particulate/binder magnetic layer formed over the front side of the substrate, wherein the magnetic medium has a cross web dimensional difference from the magnetic recording head used therewith of less than 900 microns/meter over a 35 degree temperature range, and over a 70% relative humidity range. In one embodiment, the substrate is a polymeric film which has been subjected to a biaxial tensilization process, thus having a lower coefficient of hygroscopic expansion and coefficient of thermal expansion than an otherwise identical film substrate which has not been biaxially tensilized. The magnetic recording medium formed using such a tensilized substrate has a Wyko Ra smoothness of less than about 10 nm, and a coefficient of thermal expansion from about 5 ppm/C to about 10 ppm/C.

REFERENCES:
patent: 4420532 (1983-12-01), Yamaguchi et al.
patent: 1044788 (2000-10-01), None
“Magnetic Tape Storage Roadmap,” National Storage Industry Consortium, Feb. 2002, p. 55.
“Mechanics and Reliability of Flexible Magnetic Media,” Second Edition, Bharat Bhushan, pp. 89-91.

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