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Particulate Magnetic Storage Medium

IP.com Disclosure Number: IPCOM000048618D
Original Publication Date: 1982-Feb-01
Included in the Prior Art Database: 2005-Feb-08
Document File: 2 page(s) / 24K

Publishing Venue

IBM

Related People

Hinkel, H: AUTHOR [+3]

Abstract

A heatable planar molding tool 1, 2 is used to mold plastic foils 3, 4, which are pigmented with magnetic particles, and, if necessary, liquid resin with a plastic core 5 preferably consisting of fiber-reinforced plastic prepregs. After the molding tool 1, 2 has been heated by heater 6 and the resin components have started to flow, a strong inhomogeneous static or rotating magnetic field H is applied. This causes the magnetic particles to be aligned in the desired direction and to rise to the surface. As a result, there is a high particle density which, in turn, affords a higher bit density close to the surface.

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Particulate Magnetic Storage Medium

A heatable planar molding tool 1, 2 is used to mold plastic foils 3, 4, which are pigmented with magnetic particles, and, if necessary, liquid resin with a plastic core 5 preferably consisting of fiber-reinforced plastic prepregs. After the molding tool 1, 2 has been heated by heater 6 and the resin components have started to flow, a strong inhomogeneous static or rotating magnetic field H is applied. This causes the magnetic particles to be aligned in the desired direction and to rise to the surface. As a result, there is a high particle density which, in turn, affords a higher bit density close to the surface.

By means of planar polished tool 1, 2 of high surface quality, the storage medium can be produced in one step. The thickness of the magnetic particle layer is variable in the vicinity of the foils 3, 4, leading to a uniform layer thickness and thus to a uniform distribution of the magnetic particles on the substrate, so that a greater part of the surface can be used for storage.

During the manufacture of the storage medium, the degree of pigmentation of the resin, i.e., the proportion of the magnetic particles in the resin, the heating, the heating curve, the pressure of the molding tool, the composition and viscosity of the resin and the core, as well as the strength and the kind of inhomogeneous magnetic field are optimally adapted to each other.

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