Patent ID: 6124002
Filing Date: 2000-09-26
Classification: G11B

Abstract:
A method to manufacture magnetic recording media comprising the steps of:(a) obtaining a non-magnetic support strip;(b) applying a magnetic coating composition on said non-magnetic support strip to form an unfinished magnetic recording medium, said magnetic coating composition containing ferromagnetic fine particles; and(c) traveling said unfinished magnetic recording medium through a random orientation means;(d) wherein said random orientation means comprising a set of magnetic lines associated with a single magnet, which is an elongated magnet bar having two opposing long faces as north and south pole faces, respectively, and is oriented such that its principal axis, pointing from said south pole face to said north pole face, is not perpendicular to said magnetic recording medium; and(e) said set of magnetic lines containing first and second magnetic field components, both of which are perpendicular to the plane of said magnetic recording medium;(f) further wherein said first and second magnetic field components are substantially equal in magnitude but opposite in direction, such that when said ferromagnetic fine particles travel past said first magnetic field component, they are forced to orient in one direction, and are forced to orient in a reversed direction when they travel past said second magnetic field component, so as to cause random orientation of said ferromagnetic fine particles by said single magnet.