Transfer process for forming magnetic disk memories
AssigneeMemron, Inc.
InventorGregory R. Lynch
Life of this patent
Estimating the term…
Abstract
A unitized indirect gravure coating process for forming magnetic disks. Transfer pads coating techniques are applied to conventional magnetic coating materials to form high density, longitudinal, perpendicular or annual magnetic coatings for floppy or rigid disks.
Claims30
A process for forming a magnetic coating on a supporting substrate comprising depositing a liquid dispersion of magnetic material in a mold having a nominal depth and an upper surface, passing a blade along the upper surface to remove excess liquid and precisely define the coating thickness and configuration and, using a compliant transfer media, picking up the formed liquid dispersion of magnetic material from the mold and transferring the liquid dispersion to the supporting substrate to form a magnetic coating thereon, then drying the coating.
A process for forming an oriented magnetic coating on a supporting substrate, comprising:
- forming a magnetic particle dispersion;
- depositing the dispersion into a mold having a predetermined configuration and nominal depth;
- using a discrete, compliant transfer media, picking up the formed magnetic particle dispersion from the mold and transferring the dispersion to the supporting substrate to form a magnetic coating thereon;
- and
- in a predetermined sequence, orienting the magnetic particles of the coating to a preferred magnetic alignment by applying a magnetic field thereto, and curing the coating to adhere the coating to the substrate and maintain the particle magnetic orientation.
A process for forming a flexible magnetic disk composite of magnetic oxide coating on a supporting substrate, comprising:
- providing a mold having an etched surface pattern of predetermined nominal depth;
- depositing a magnetic oxide coating material in the pattern;
- removing the excess material from the mold surface to define the coating within the pattern;
- contacting the coating with a discrete transfer medium to temporarily adhere the defined coating to the medium;
- transferring the coating from the medium to the substrate;
- establishing a preferred magnetic orientation in the coating;
- and
- curing the coating.
A process for forming a flexible magnetic disk composite of magnetic oxide coating on a supporting substrate, comprising:
- providing a mold having an etched surface pattern of predetermined nominal depth;
- depositing a magnetic oxide coating material in the pattern;
- removing the excess material from the mold surface to define the coating within the pattern;
- contacting the coating with a discrete silicone transfer medium to temporarily adhere the defined coating to the medium;
- transferring the coating from the medium to the substrate;
- establishing a preferred magnetic actual orientation in the coating;
- and
- curing the coating.
Dependencies are inferred from the claim text.